Updated on 2024/09/28

Information

 

写真a

 
MIYAZAKI HIROSHI
 
Organization
Faculty of Information Science and Electrical Engineering Department of Electrical Engineering Professor
Research Institute of Advanced Electric Propulsion Aircrafts (Concurrent)
Research Institute of Superconductor Science and Systems (Concurrent)
School of Engineering Department of Electrical Engineering and Computer Science(Concurrent)
Graduate School of Information Science and Electrical Engineering Department of Electrical and Electronic Engineering(Concurrent)
Joint Graduate School of Mathematics for Innovation (Concurrent)
Title
Professor
Contact information
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Profile
R&D of a superconducting rotating machine to realize an electric propulsion system for aircraft to replace jet engines.
Homepage
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Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Power engineering

Degree

  • なし

Research Interests・Research Keywords

  • Research theme:Research and development of electric propulsion aircraft

    Keyword:zero emission, electric propulsion, hydrogen fuel, superconducting magnet, motor

    Research period: 2021.4 - 2026.3

Awards

  • 令和2年度関東地方発明表彰(発明奨励賞)

    2020.11   公益社団法人 発明協会   超電導電流リード(特許第5421170号)

  • 平成30年度関東地方発明表彰(発明奨励賞)

    2018.11   公益社団法人 発明協会   超電導コイル(特許第5259487号)

  • 低温工学・超電導学会 論文賞

    2014.5   公益社団法人 低温工学・超電導学会   「RE 系超電導伝導冷却コイルの開発 —シングルパンケーキ含浸コイルの熱暴走および機械特性の評価と解析—」低温工学 第48巻5号、239~246頁

  • 低温工学・超電導学会 奨励賞

    2013.5   公益社団法人 低温工学・超電導学会  

  • 低温工学・超電導学会 優良発表賞

    2012.5   公益社団法人 低温工学・超電導学会   「イットリウム系12積層コイルの磁場中通電試験(2)—バックアップ4T磁場中通電試験—」

Papers

  • Fabrication and Test of a 400 kW-Class Fully Superconducting Synchronous Motor Using REBCO Tape for an Electric Propulsion System

    H. Miyazaki, M. Iwakuma, Y. Emori, H. Sasa, K. Yoshida, S. Sato, S. Miura, I. Sagara, Y. Suzuki, M. Konno, H. Hirai, T. Izumi

    IEEE Transactions on Applied Superconductivity   34 ( 5 )   1 - 6   2024.8   ISSN:1051-8223 eISSN:1558-2515

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    Advanced electric propulsion systems have been developed by utilizing superconducting technologies to reduce carbon dioxide emissions from aircraft. This study presents the progress in the development of a 400 kW-class fully superconducting synchronous motor using REBa2Cu3O7-δ (REBCO) tape. REBCO tapes have high critical current densities; thus, they can generate a strong magnetic field without an iron core, permitting the fabrication of small-sized motors compared with conventional motors that use copper wires and iron cores. The 400 kW-class fully superconducting synchronous motor comprises field and armature coils. The field coil was wound with cos-theta-like racetrack distribution to generate a dipole field without an iron core. The maximum magnetic field is 1.45 T when the operating current is 110 A DC. The armature coil comprises six racetrack-shaped pancakes wound with six-strand parallel conductors. The parallel conductors were transposed inside the windings, resulting in a uniform current distribution in each conductor. The motor utilized carbon fiber-reinforced plastic (CFRP) for the casing instead of stainless steel for weight reduction. Foam insulation was adopted to further reduce the mass, in which an adiabatic material was wrapped around the external part of the CFRP casing. The armature coil was cooled using sub-cooled liquid nitrogen (LN2), with high electrical insulation and a stable liquid phase. In contrast, the field coil was cooled by utilizing helium gas instead of LN2 because sealing the LN2 with a magnetic fluid seal is challenging. The motor was tested in a synchronous generator mode and subsequently rotated by utilizing three bipolar power supplies. The motor successfully rotated at 441 rpm when the field current was 72 A, the armature current was 103 Arms, and the frequency was 7.35 Hz.

    DOI: 10.1109/TASC.2023.3345291

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  • Evaluation of the AC Loss Characteristics of Multifilamentary REBCO Tapes by the Mechanical Scratching of MgO Areas

    Ryoma Oishi, Kodai Jingami, Hiroshi Miyazaki, Masataka Iwakuma, Shun Miura, Hiromasa Sasa, Koichi Yoshida, Masanori Daibo, Shinji Fujita

    IEEE Transactions on Applied Superconductivity   34 ( 5 )   1 - 6   2024.8   ISSN:1051-8223 eISSN:1558-2515

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    AC loss is a common challenge in superconducting AC applications that increases the temperature and causes quenching, and therefore, it is crucial to reduce the AC loss. Multifilament tapes fabricated via a new method that can create a low critical current density region in the superconducting layer by scratching a buffer layer to make it multifilamentary has been proposed. However, these tapes are not completely insulated. Few studies have compared the measured AC losses of coils wound with multifilament and monofilament tapes and identified whether scaling laws are adaptable to multifilament tapes. In this study, we measure the AC losses of multifilament tapes under various conditions, such as with thinner copper layers and two-stacked pancake coils wound with them, to examine the effect of electrical coupling using a copper plate and confirm the AC loss reduction effect, respectively. These tapes are not physically separated from each other, and therefore, the AC loss is measured by varying the number of coils turns. We investigate whether the scaling laws are applicable to the multifilament tapes. The results confirm that coupling loss is present; however, the AC loss for B > 0p (B and Bp represent the external magnetic field amplitude and the magnet field amplitude when it penetrates the superconducting layer, respectively) is reduced sufficiently. Further, the temperature and field angle scaling law can be adapted to this multifilament tape. The AC losses of the coils wound with monofilament and multifilament tapes did not show any significant differences when the number of turns was changed.

    DOI: 10.1109/TASC.2024.3370097

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  • Current Distributions in Armature Coils Comprising Two Sizes of Racetrack Double-Pancakes with REBCO Striated Tapes

    Atsushi Takashima, Hiroshi Miyazaki, Shun Miura, Koichi Yoshida, Seiki Sato, Hiromasa Sasa, Masataka Iwakuma

    IEEE Transactions on Applied Superconductivity   34 ( 5 )   1 - 5   2024.8   ISSN:1051-8223 eISSN:1558-2515

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    We propose transposed parallel conductors that can equalize the current distribution in the coils of a superconducting motor with an armature winding imitating a distributed winding using REBa2Cu3Oy(REBCO) tapes. However, AC loss increases the coil temperature, resulting in a quench. A striated REBCO tape with a filament divided into multiple filaments can effectively reduce AC loss. We measured the current flow distribution in the coils using transposed parallel conductors composed of striated REBCO tapes. Additionally, we experimentally demonstrate current equalization based on the transposition of the previous armature winding using only a small coil. We arranged two REBCO tapes side-by-side to simulate a striated tape divided into two filaments. The double-pancake coils in the armature coils were wound with the striated tapes and transposed at the connection point between each pole and the innermost circumference of the coils. We measured and verified the inductance of each tape. Additionally, we measured the current distributions for both U- and three-phase current flows.

    DOI: 10.1109/TASC.2024.3356439

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  • Current Sharing Among Three-Strand Parallel Conductors Composed of REBCO Tapes in Three-Phase Armature Coil Conditions

    Shun Miura, Kazuki Nakamura, Yohei Masuda, Goki Kawasaki, Hiroshi Miyazaki, Akifumi Kawagoe, Hiromasa Sasa, Koichi Yoshida, Seiki Sato, Masataka Iwakuma

    IEEE Transactions on Applied Superconductivity   34 ( 5 )   1 - 5   2024.8   ISSN:1051-8223 eISSN:1558-2515

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    Fully superconducting synchronous motors are very interesting for mobile applications such as aviation, thanks to their high output power density (kW/kg). In order to obtain a large current capacity, multi-strand parallel conductors are usually used in armature coils but parallel conductors without transposition present non-uniform current sharing. In this manuscript, current sharing properties among three REBa2Cu3Oy parallel tapes with/without a transposition in three-phase armature coil conditions, were investigated experimentally and analytically. The sample coils were prepared under the three-phase arrangement of armature coils for a two-pole rotating machine, and its branch currents were evaluated by Rogowski coils by applying AC transport current in liquid nitrogen at 77 K. We demonstrated that the introduction of the transposition was also an effective way to control the current sharing in rotating magnetic fields generated by the three-phase armature coils as well as single-phase situations. In addition, the influence of other phase armature coils on the current sharing was discussed via analytical calculations.

    DOI: 10.1109/TASC.2024.3352521

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  • Effectiveness of REBCO Trapezoidal Armature Coils Used in Superconducting Induction Motors

    Masahiko Tsumori, Ryoto Yamasaki, Yuta Okade, Hiroshi Miyazaki, Shun Miura, Hiromasa Sasa, Koichi Yoshida, Masataka Iwakuma

    IEEE Transactions on Applied Superconductivity   34 ( 5 )   1 - 6   2024.8   ISSN:1051-8223 eISSN:1558-2515

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    —Armature coils that use REBa2Cu3Oy (REBCO) wires are typically racetrack shaped owing to the tape shape of the wires. It is difficult to improve the motor output in armature windings composed of racetrack coils. Previously, we proposed trapezoidal-shaped REBCO coils for armature windings. In this study, we perform electromagnetic simulations of two types of induction motors with armature windings, one composed of trapezoidal coils and the other of racetrack coils. Subsequently, we show that the induction motor using trapezoidal coils exhibit a higher output than that using racetrack coils. Moreover, we present the fabrication of six trapezoidal coils for use in the armature winding and present the current-voltage (I − V ) characteristics of the coils to determine the current flow. The results show that a current of 80 A or higher could flow in all the coils. Finally, we present the results from a load test of an induction motor that incorporates the trapezoidal coils for the armature winding and the corresponding torque slip characteristics. The analysis and load test results are comparable, thus experimentally demonstrating the effectiveness of using trapezoidal coils for armature windings to increase the motor output.

    DOI: 10.1109/TASC.2023.3345300

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  • Electromagnetic Design of a REBCO Four-Pole Full-Pitched Armature Coil Composed of Trapezoidal Windings for Fully Superconducting Synchronous Motors

    Yuki Emori, Hiroshi Miyazaki, Shun Miura, Hiromasa Sasa, Masataka Iwakuma

    IEEE Transactions on Applied Superconductivity   34 ( 5 )   1 - 5   2024.8   ISSN:1051-8223 eISSN:1558-2515

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    An electric propulsion system is one of the solutions to achieve low carbon dioxide emissions from aircraft. In this regard, a superconducting motor is being developed to achieve higher power density than conventional motors. Because a REBa2Cu3O7-σ (REBCO) wire is difficult to bend freely owing to its tape shape, racetrack windings are often used for the armature coils of the superconducting motors. Although the output power can be increased for the same armature current by widening the armature winding pitch angle, the racetrack armature has only a small pitch of 30°. A full-pitched armature with the maximum pitch angle has not been realized in past studies. Therefore, in this study, we propose an unprecedented configuration method of a four-pole full-pitched armature coil composed of trapezoidal windings. To investigate the advantages of the armature, we made a 2D cross-sectional model and determined torque using the finite element method of electromagnetic field analysis. Consequently, we verified that the trapezoidal four-pole armature had lower torque ripple and higher power density than the conventional two-pole racetrack armature. This study confirmed that the proposed novel armature had better characteristics than conventional ones. The armature can make the motor lightweight and low-noise.

    DOI: 10.1109/TASC.2024.3358250

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  • Measurement System for Induced Currents in Superconducting Air-Core Rotors for Induction Motors

    Akifumi Kawagoe, Ryunosuke Torii, Shinpei Nakagawa, Shun Miura, Hiroshi Miyazaki, Masataka Iwakuma

    IEEE Transactions on Applied Superconductivity   34 ( 5 )   1 - 5   2024.8   ISSN:1051-8223 eISSN:1558-2515

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    We are conducting research and development of an all-superconducting induction motor with lightweight. A lightweight induction motor can be realized by making the rotor without an iron core. To evaluate the characteristics of the induction motor without an iron core and to design an optimal induction motor, it is necessary to quantitatively clarify the characteristics of the current flowing in the superconducting rotor with an air core. In this study, an experimental apparatus was developed to measure the induced current flowing in a rotor exposed to a rotating magnetic field using a pickup coil. In the experiment, a squirrel-cage rotor sample made of YBCO tape 81 mm in diameter and 170 mm in length was placed in a space 120 mm in diameter, and a rotating magnetic field was applied. The temperature of the rotor sample is liquid nitrogen temperature. The rotor sample consisted of six rotor bars and end rings. The rotor bars consisted of one wire with a critical current of 110 A. The magnetic moment of the rotor was measured with three pickup coils, and then the induced current in the rotor was evaluated.

    DOI: 10.1109/TASC.2024.3385737

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  • Effects of moving magnetic materials in and out of superconducting magnet for active magnetic regenerative refrigeration system

    Kyohei Natsume, Tsuyoshi Shirai, Akira Uchida, Yusuke Kimura, Yuki Emori, Hiroshi Miyazaki, Gen Nishijima, Koji Kamiya, Koichi Matsumoto, Takenori Numazawa

    IEEE Transactions on Applied Superconductivity   34 ( 5 )   1 - 5   2024.8   ISSN:1051-8223 eISSN:1558-2515

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    A reciprocating type active magnetic regenerative refrigeration (AMR) utilizes the magnetocaloric effect of magnetic materials which occurs during magnetization and demagnetization processes by moving magnetic materials in and out of a magnet. Estimating the induced voltage and electromagnetic force in the superconducting magnet during the reciprocation is crucial to optimize the design of the AMR system. This paper represents the behavior of the superconducting magnet during the AMR operation that the magnetic material HoAl2 weighing 250 g enters and exits the 120 mm bore NbTi superconducting coil. The calculation and measurement results of the induced voltage and electromagnetic force in the magnetic field of 0-5 T at 25 K were reported.

    DOI: 10.1109/TASC.2024.3384342

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  • Current Distribution among Transposed Eight- and 16-Parallel REBa<inf>2</inf>Cu<inf>3</inf>O<inf>y</inf>Wires in Single-Phase Armature Coils

    Shun Miura, Asato Kobun, Yohei Masuda, Goki Kawasaki, Hiroshi Miyazaki, Akifumi Kawagoe, Hiromasa Sasa, Koichi Yoshida, Seiki Sato, Masataka Iwakuma

    IEEE Transactions on Applied Superconductivity   34 ( 3 )   1 - 6   2024.5   ISSN:1051-8223 eISSN:1558-2515

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    Fully superconducting synchronous motors employing superconducting armature and field coils, have a great possibility for electric propulsion systems in aircraft applications, owing to their high output power density (kW/kg). To realize a large current capacity in REBa2Cu3Oy superconducting armature coils, we have proposed a cabling design for the transposed multi-strand parallel conductors. In this study, branch currents among eight- and 16-strand parallel conductors having only one transposition into a coil, were investigated. The analytical calculations showed approximately uniform branch current for the eight- and 16-strand conductors. According to the calculations, the deviations to the uniform branch current of eight-strand parallel conductors were ±7%. The approximately uniform current for the eight-strand conductors were also demonstrated experimentally by small-sized sample coils.

    DOI: 10.1109/TASC.2024.3356436

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  • Electromagnetic design for high power density of fully superconducting synchronous motor with through-shaft type field coil for electric aircraft

    Uriu K., Iwakuma M., Miyazaki H., Miura S., Sasa H.

    Journal of Physics: Conference Series   2776 ( 1 )   2024   ISSN:17426588

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    The global demand for aircraft is currently increasing, paralleled by a growing emphasis on decarbonization through the replacement of fossil fuel engines with electric propulsion. In response to this trend, we have developed a superconducting motor distinguished by its high efficiency, output, and low weight. Our focus centers on two critical aspects. Firstly, we addressed the issue of the field coil's shape. The widely used REBCO wire in high-temperature superconductivity is tape-shaped, making a racetrack coil the most straightforward method for winding the wire. However, this configuration necessitates dividing the motor shaft as it comes in contact with the field coil, raising concerns about the mechanical durability of motors. To overcome this challenge, we introduce a saddle-type coil and design a coil shape that achieves a single continuous through-axis. Utilizing the Frenet-Serre formula, we created a 3D model of the coil's end without applying load to the wire. This method, previously employed in accelerators, enhances durability, potentially leading to increased output due to higher rotation speeds and reduces weight through part savings. Secondly, introducing a saddle coil presents challenges in forming an ideal magnetic field distribution. In a rotating-field-type motor using an iron core, the winding can be directly wound around it, resulting in multiple coils forming similar magnetic fields that can be superimposed to create one large magnetic pole. However, with a saddle coil, coils are arranged along the circumference, and the magnetic field distribution and an anticipated decrease in output. To address this, we aimed to optimize the magnetic field distribution and increase output through a parameter survey. Specifically, we conducted an analysis under fixed armature conditions (current, number of turns, and shape) in three cases. In Case1, with a fixed total number of turns for the field coil, we compared magnetic field distributions and output by varying the number and arrangement of coils. In Case2, building on the findings of Case1, we aimed to enhance output by fixing the coil arrangement and increasing the number of turns. Finally, in Case 3, we examined the change in motor size with fixed coil parameters while altering the coil arrangement and pitch.

    DOI: 10.1088/1742-6596/2776/1/012012

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  • Calculation on Current Distributions among Transposed Three- and Six-parallel Conductors in Superconducting Armature Coils for Superconducting Synchronous Motors

    Kawasaki G., Miura S., Miyazaki H., Iwakuma M.

    Journal of Physics: Conference Series   2776 ( 1 )   2024   ISSN:17426588

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    The armature coil of the superconducting synchronous motor for electric aircraft requires a current of 1,000 A or more. However, a single superconducting tape at liquid nitrogen temperatures is insufficient for this operating current. Therefore, the armature coil should be composed of multi-strand parallel conductors. If the coil is constructed from parallel conductors, the inductance balance between the parallel conductors will be collapsed, so the current distributions will be non-uniform. As a solution for this issue, the uniform current distribution can be achieved by the transposition technique that changes the order in which tapes are stacked. Our previous research has developed the transposition method for the 2n-strand parallel conductors (n = 1, 2, 3, and so on). However, some of the superconducting synchronous motors are actually designed using a number of parallel conductors other than 2n. This study focused on the three- and the six-strand parallel conductors. We analytically clarified the unique transposition configuration for the three-strand parallel conductors that achieves uniform current distribution, and the transposition configuration for the six-strand parallel conductors by combining the transposition configuration for the three- and two-strand parallel conductors. As a result, the current distribution ratio became less than ±5% when the number of turns of the double pancake coil was a multiple of six by applying the transposition.

    DOI: 10.1088/1742-6596/2776/1/012004

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  • AC Loss Estimation Method for REBCO Superconducting Tapes in AC+DC Fields for Field Windings in Fully Superconducting Synchronous Machine for Electric Aircraft

    Sasa H., Jingami K., Oishi R., Miura S., Miyazaki H., Iwakuma M.

    Journal of Physics: Conference Series   2776 ( 1 )   2024   ISSN:17426588

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    The estimation of AC loss in REBa2Cu3Oy (REBCO; RE = rare earth, such as Y, Eu, and Gd) superconducting tapes within superconducting synchronous motors and generators for electric aircraft is imperative during the design stage phase to optimize efficiency and cooling considerations. Our previous studies clarified the AC loss characteristics, focusing on estimating the AC loss in armature windings. While the magnetic field applied to the armature windings is exclusively as an AC field, the field windings are subject to a composite field comprising both AC and DC components. Notably, the amplitude of the AC component is markedly smaller than the magnitude of DC component. This study experimentally investigated to consider the AC loss properties in field windings. The experimental results were as follows: When subjected to operational conditions of field windings within synchronous motor and generator, the AC loss increased with the DC field strength. This property is attributed to a reduction in the critical current induced by the external field. Hence, we modified the method for estimating AC loss. Subsequently, we validated the effectiveness of the modified method.

    DOI: 10.1088/1742-6596/2776/1/012003

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  • Current Sharing among Transposed Three-Parallel REBa<inf>2</inf>Cu<inf>3</inf>O<inf>y</inf> Tapes in Single-Phase Armature Coils

    Shun Miura, Asato Kobun, Yohei Masuda, Kazuki Nakamura, Hiroshi Miyazaki, Akifumi Kawagoe, Hiromasa Sasa, Koichi Yoshida, Seiki Sato, Masataka Iwakuma

    IEEE Transactions on Applied Superconductivity   33 ( 5 )   2023.8   ISSN:1051-8223 eISSN:1558-2515

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    To realize a large current capacity in REBa2Cu3Oy superconducting coils, we have proposed a cabling design for the transposed multi-strand parallel conductors. This cabling design is also useful for a superconducting armature coil in a fully superconducting rotating machine system. Very recently, we developed an analytical method based on simple modeling, to roughly calculate the current distributions among the continuous strands in rotating machine conditions. In this manuscript, the current distributions predicted by the analytical method were compared with the measured values. Further, to understand the complex current distribution property for the three-strand parallel conductors, the turn number dependence of the current distribution with various transposition combinations was investigated. The current branches were measured under liquid nitrogen temperature of 77.3 K by Rogowski coils by applying AC transport current. The analytical method described the complex current distribution of the strands well, especially the coil with a large number of turns.

    DOI: 10.1109/TASC.2023.3241824

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  • Basic Concept for Uniform Current Distribution in Parallel Conductors by Introducing a Small Number of Transpositions in REBCO Armature Coils

    Asato Kobun, Yohei Masuda, Shun Miura, Hiroshi Miyazaki, Koichi Yoshida, Seiki Sato, Hiromasa Sasa, Masataka Iwakuma

    IEEE Transactions on Applied Superconductivity   33 ( 5 )   2023.8   ISSN:1051-8223 eISSN:1558-2515

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    We propose the concept of uniform current between groups (CUCG) in superconducting armature coils composed of two or more strands of transposed parallel conductors. We validate the proposed concept by measuring the current distributions in several double pancake test coils comprising two and four parallel conductors using Rogowski coils by applying AC signals of varying frequencies and amplitudes. Accordingly, uniform transport currents across four strands were confirmed. The proposed concept produced uniform current distributions across four groups of parallel conductors with a small number of transpositions. This work paves the way for developing armature coils composed of more than eight strands in parallel conductors by introducing a small number of transpositions based on CUCG.

    DOI: 10.1109/TASC.2023.3242621

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  • Current Distribution of Armature Coils Combining Two Different Sizes of REBCO Racetrack Double Pancakes

    Atsushi Takashima, Yuki Onamyuda, Asato Kobun, Hiroshi Miyazaki, Akifumi Kawagoe, Shun Miura, Koichi Yoshida, Seiki Sato, Hiromasa Sasa, Masataka Iwakuma

    IEEE Transactions on Applied Superconductivity   33 ( 5 )   2023.8   ISSN:1051-8223 eISSN:1558-2515

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    We are currently developing superconducting electric propulsion armature coils which utilize REBa2Cu3Oy (REBCO) strands. To implement the REBCO coils in aircraft, the voltage must be reduced for safety concerns by using high-current capacity. Parallel conductors can be used to expand the current capacity, but the current cannot flow equally through each strand owing to the slight difference in inductance. We have investigated transposed parallel conductors which can almost equalize the inductance of each conductor. Conversely, the distributed windings for the armature coils can improve the magnetic field waveform and transform it into a sine wave by reducing the distortion of the magnetic flux density about the rotating magnetic field. However, it is difficult to implement a distributed armature winding using the REBCO strands since it is tape-shaped and difficult to twist. Therefore, we propose a distributed armature winding which combines two types of racetrack double pancakes. Each double pancake comprises two-strand insulated REBCO superconducting parallel conductors transposed inside the pancake for current equalization. In this study, we perform an experimental demonstration of the current equalization based on the transposition of the distributed armature winding. We made coils with two-strand as a simplified, but the actual coils were needed more 10 strand parallel conductors. In future works, we will manufacture transposed parallel conductor coils using much more strands and measure the current distribution. Additionally, this study measured the current distribution with only the stater. Thus, we will combine the rotor and measure the magnetic field distribution of the rotating magnetic field in the armature.

    DOI: 10.1109/TASC.2023.3241822

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  • Development and assessment of simplified analytical method for current distribution among REBa<inf>2</inf>Cu<inf>3</inf>O <inf>y</inf> parallel conductors in armature windings for fully superconducting rotating machines

    S. Miura, A. Kobun, Y. Masuda, H. Miyazaki, A. Kawagoe, H. Sasa, K. Yoshida, S. Sato, M. Iwakuma

    Superconductor Science and Technology   36 ( 6 )   2023.6   ISSN:0953-2048 eISSN:1361-6668

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    Fully superconducting rotating machines employing REBa2Cu3O y (REBCO, RE = rare earth elements or Y) superconducting armature and field coils, are particularly interesting for aircraft applications, owing to their high output power density (kW kg−1). To achieve high current capability in superconducting coils, we have proposed a cabling design for transposed multi-strand parallel conductors. In the parallel conductor design, the REBCO strands are insulated from each other, except for both terminal ends, and transposed during the winding process to achieve uniform current distribution by cancellation of interlinkage magnetic flux between the strands. In this study, a simplified analytical method considering inductances was developed based on Laplace’s equation in cylindrical coordinates to roughly calculate the current distributions of multi-strands under armature coil conditions. The validity of the analytical method was investigated through current distribution measurements of the sample coils wound with two-strand parallel conductors. Consequently, the analytical method was validated with approximately 10% deviation under the experimental coil conditions. To establish a more accurate analysis method, certain improvements are needed.

    DOI: 10.1088/1361-6668/acca4f

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  • Thermal-Electromagnetic Coupled Analysis Considering AC Losses in REBCO Windings at 65 K of 10 MW Fully-Superconducting Synchronous Generators for Electric Aircraft Reviewed

    Hiromasa Sasa, Shun Miura, Hiroshi Miyazaki, Teruyoshi Sasayama, Takashi Yoshida, Kaoru Yamamoto, Masataka Iwakuma, Yoshiji Hase, Yuichiro Sasamori, Hirokazu Honda, Msayuki Konno, Teruo Izumi

    IEEE Transactions on Applied Superconductivity   32 ( 6 )   2022.9   ISSN:1051-8223 eISSN:1558-2515

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    A large AC loss is generated in armature windings composed of a REBa&lt;sub&gt;2&lt;/sub&gt;Cu&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;&lt;i&gt;y&lt;/i&gt;&lt;/sub&gt; (REBCO, RE = rare earth, Eu, Gd, etc.) wire in a fully superconducting synchronous generator. In aircraft applications, liquid nitrogen is suitable for cooling windings because of its specific heat capacity and dielectric strength. The evaporation of liquid refrigerant significantly decreases the dielectric strength, which results in an increase in the risk of accidents by discharging. For safe operation, the temperature in the generator is set below the boiling point of nitrogen (~77 K). We calculated the temperature rise caused by the AC loss and others by applying a method that estimates the AC loss from the experimental results. This paper addresses the electromagnetic-thermal analysis in finite element method to calculate the temperature rise and proves the feasibility of a fully superconducting generator cooled by liquid nitrogen, that is, the temperature is maintained below 77 K. The output power is 10 MW. The temperature of liquid nitrogen was assumed to be 65 K, and its flow speed was set as a parameter. Additionally, we confirmed that designing a method that determines the number of parallel conductors of REBCO windings considering the temperature rise can enhance the output power density.

    DOI: 10.1109/TASC.2022.3160660

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  • Mechanical Properties of Four-Stacked Two Tape Bundled REBCO Pancake Coils Reviewed

    Kohki Takahashi, Arnaud Badel, Tatsunori Okada, Satoshi Awaji, Hiroshi Miyazaki, Satoshi Hanai, Shigeru Ioka

    IEEE Transactions on Applied Superconductivity   32 ( 6 )   2022.9   ISSN:1051-8223 eISSN:1558-2515

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    There is an ongoing plan to upgrade the 25 T cryogen-free superconducting magnet (25T-CSM), at the High Field Laboratory for Superconducting Materials (HFLSM), IMR, Tohoku University, to a 30T-CSM by replacing the existing Bi2223 insert coils with REBCO coils. For the REBCO coils of the 30T-CSM, we will adopt a robust coil concept, which consists of two tapes co-wound in a face-to-back configuration with thin FRP plates glued on the edges. To confirm the effectiveness of this concept, we performed hoop stress tests on full-scale-size four stacked pancake coils fabricated with Fujikura EuBCO tapes at conduction-cooled 20 K under a background field of 11 T. The inner and outer diameters of the pancake coils were 68 and 268 mm, respectively. The averages of the measured strains on the outermost winding were 0.17-0.24% at a hoop stress of 400 MPa estimated by the BJR relation. The I-V properties of the coils indicated no anomalous voltage, implying that our coil structure was robust against large electromagnetic stress.

    DOI: 10.1109/TASC.2022.3166469

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  • REBCO Trapezoidal Armature Windings for Superconducting Induction Motors Reviewed

    Yuta Okade, Hiroshi Miyazaki, Hiromasa Sasa, Koichi Yoshida, Shun Miura, Teruyoshi Sasayama, Takashi Yoshida, Akifumi Kawagoe, Masataka Iwakuma

    IEEE Transactions on Applied Superconductivity   32 ( 6 )   2022.9   ISSN:1051-8223 eISSN:1558-2515

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    For extensive use in electric vehicles, electric airplanes, and other such applications, superconducting motors are designed to be lightweight and have a high power density. Rare-earth barium copper oxide (REBCO) tapes are considered a potential material for use in these motors because of their high critical current density. Because REBCO can be modeled into tape shapes, motors with racetrack coils as armature windings have been studied. However, racetrack coils are inferior in terms of increasing the interlinkage flux to the rotor compared with distributed windings. In this study, we propose trapezoidal REBCO tape coils for shaping armature windings into distributed windings. Next, 2 kW-class induction motors using two types of coils - the trapezoidal and racetrack coils - were designed to compare the characteristics of the two motors. The JMAG-Designer software was used to perform electromagnetic simulations on the two models. The results revealed that the motor with trapezoidal coils required less REBCO tapes and exhibited a lower vertical component of magnetic flux density than the racetrack coils did. Therefore, the AC loss of the trapezoidal coils becomes lower than that of the racetrack coils, and the trapezoidal coils weigh less than racetrack coils.

    DOI: 10.1109/TASC.2022.3160146

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  • Numerical simulation of a high-power density 10 MW REBCO superconducting synchronous generator cooled by sub-cooled LN<inf>2</inf>for low AC loss Reviewed

    Kaito Noda, Hiromasa Sasa, Hiroshi Miyazaki, Shun Miura, Takashi Yoshida, Teruyoshi Sasayama, Masataka Iwakuma, Akifumi Kawagoe, Teruo Izumi, Masayuki Konno, Yuichiro Sasamori, Hirokazu Honda, Yoshiji Hase, Masao Shutoh

    Journal of Physics: Conference Series   2323 ( 1 )   2022.8   ISSN:1742-6588 eISSN:1742-6596

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    Generators used in electric aircraft require a high-power density, and AC loss is also a significant problem. We designed 10 MW REBCO superconducting synchronous generators at 64 K to achieve a power density of 20 kW/kg and low AC loss. In this study, electromagnetic analyses were performed using finite element method software. Consequently, the thickness of the back yoke is 50 mm or less so that the generator can meet the target power density. The method of decreasing the magnetic field of the armature winding and increasing that of the field winding was used to effectively reduce the AC loss. As a result, the generator achieved a high-power density of 21.0 kW/kg, reducing the AC loss from over 600 kW to 415 kW.

    DOI: 10.1088/1742-6596/2323/1/012037

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  • Experimental Evaluation of Current Distribution in Three-Strand Transposed Parallel Conductors Composed of REBCO Superconducting Tapes Reviewed

    Yuki Omanyuda, Hiromasa Sasa, Hiroshi Miyazaki, Shun Miura, Masataka Iwakuma

    IEEE Transactions on Applied Superconductivity   32 ( 6 )   2022.2   ISSN:1051-8223 eISSN:1558-2515

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    We investigated current distribution in three-strand transposed parallel conductors consisting of REBa&lt;sub&gt;2&lt;/sub&gt;Cu&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;y&lt;/sub&gt; (REBCO, RE = rare earth) superconducting tapes under applied AC magnetic fields. We recently derived the theoretical expression for the additional AC loss caused by the formation of three-strand transposed parallel conductors and proved its validity through experiments. However, the conditions of each strand and current distribution have not yet been discussed. Accordingly, we measured the current distribution and compared it with the calculated distribution derived using the theoretical expression. From the results, we found that the current branch ratio of the three strand can also be predicted via the theoretical expression.

    DOI: 10.1109/TASC.2022.3154338

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  • Detection and Protection against Quench/Local Thermal Runaway for a 30 T Cryogen-Free Magnet Reviewed

    Arnaud Badel, Tatsunori Okada, Kohki Takahashi, Shinji Fujita, Hiroshi Miyazaki, Shigeru Ioka, Satoshi Awaji

    IEEE Transactions on Applied Superconductivity   31 ( 5 )   2021.8

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    DOI: 10.1109/TASC.2021.3059604

  • Robust REBCO Insert Coil for Upgrade of 25 T Cryogen-Free Superconducting Magnet Reviewed

    Satoshi Awaji, Arnaud Badel, Tatsunori Okada, Kohki Takahashi, Hiroshi Miyazaki, Satoshi Hanai, Shigeru Ioka, Shinji Fujita, Shogo Muto, Yasuhiro Iijima, Masanori Daibo, Kazuhiro Kajikawa

    IEEE Transactions on Applied Superconductivity   31 ( 5 )   2021.8

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    DOI: 10.1109/TASC.2021.3061896

  • Electromagnetic Characteristics Study of Two-Ply REBCO Tapes Pancake Coils Reviewed

    Kohki Takahashi, Tatsunori Okada, A. Badel, S. Awaji, H. Miyazaki, S. Hanai, S. Ioka

    IEEE Transactions on Applied Superconductivity   31 ( 5 )   2021.8

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    DOI: 10.1109/TASC.2021.3069685

  • Study on a Stacked REBCO Coil Composed of Six Single Pancakes with Electrically Conductive Epoxy Resin Reviewed

    Hiroshi Miyazaki, Sadanori Iwai, Tatsuro Uto, Takashi Kusano, Hirotaka Ishii, Toshinobu Ito, Shunji Nomura

    IEEE Transactions on Applied Superconductivity   30 ( 4 )   2020.6

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    DOI: 10.1109/TASC.2020.2991260

  • Test results of a REBCO superconducting switch for reducing temporal fluctuations in driven-mode Reviewed

    S. Iwai, Y. Otani, H. Miyazaki, T. Tosaka, S. Nomura, T. Ito

    Journal of Physics: Conference Series   1559 ( 1 )   2020.6

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    DOI: 10.1088/1742-6596/1559/1/012114

  • Development of a Bypass Circuit for a REBCO Coil Using Flux Flow Resistance Reviewed

    Sadanori Iwai, Hiroshi Miyazaki, Yasumi Otani, Taizo Tosaka, Shunji Nomura, Yusuke Ishii

    IEEE Transactions on Applied Superconductivity   29 ( 5 )   2019.8

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    DOI: 10.1109/TASC.2019.2906978

  • Over-current test of REBCO pancake coils impregnated with electrically conductive epoxy resin under conduction-cooled conditions Reviewed

    Hiroshi Miyazaki, Sadanori Iwai, Tatsuro Uto, Takashi Kusano, Yasumi Otani, Kei Koyanagi, Shunji Nomura

    IEEE Transactions on Applied Superconductivity   29 ( 5 )   2019.8

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    DOI: 10.1109/TASC.2019.2909795

  • Field Stability Analysis of 25 T Cryogen-Free Superconducting Magnet and Upgrade Plans for 30 T System at HFLSM, IMR, Tohoku University Reviewed

    Satoshi Awaji, Yuto Imai, Kohki Takahashi, Tatsunori Okada, Arnaud Badel, Hiroshi Miyazaki, Satoshi Hanai, Shigeru Ioka

    IEEE Transactions on Applied Superconductivity   29 ( 5 )   2019.8

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    DOI: 10.1109/TASC.2019.2898699

  • Development of an HTS Accelerator Magnet with REBCO Coils for Tests at HIMAC Beam Line Reviewed

    Shigeki Takayama, Sadanori Iwai, Yoichi Kubo, Kei Koyanagi, Hiroshi Miyazaki, Tomofumi Orikasa, Yusuke Ishii, Tsutomu Kurusu, Naoyuki Amemiya, Toru Ogitsu, Yoshiyuki Iwata, Koji Noda, Masahiro Yoshimoto

    IEEE Transactions on Applied Superconductivity   29 ( 5 )   2019.8

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    DOI: 10.1109/TASC.2019.2906406

  • AC loss evaluation of a 10T Class Small REBCO coil with conduction-cooled configuration Reviewed

    Sadanori Iwai, Hiroshi Miyazaki, Yasumi Otani, Taizo Tosaka, Shunji Nomura, Tsutomu Kurusu

    IEEE Transactions on Applied Superconductivity   28 ( 3 )   2018.4

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    DOI: 10.1109/TASC.2018.2809601

  • 高磁場コイルシステムの研究開発:―高磁場MRI 用高温超電導磁石の開発― Reviewed

    宮﨑 寛史, 福山 秀直, 岩井 貞憲, 戸坂 泰造, 野村 俊自, 来栖 努, 植田 浩史, 野口 聡, 石山 敦士, 浦山 慎一

    低温工学   52 ( 4 )   224 - 233   2017.8

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    <p>A project for developing of RE1Ba2Cu3O7-&delta; (REBCO) magnets to be utilized in ultrahigh-field magnetic resonance imaging (MRI) was started in 2013. Our final targets are 9.4 T MRI systems for whole-body and brain imaging. In this project, two different development approaches towards the final target were planned. One is a small REBCO coil that can generate 10 Tclass magnetic fields, which is the same level as the target magnetic field. The other is a conduction-cooled 1.5 T REBCO MRI magnet that has a room-temperature bore of 396 mm, which is as large as those of mid-sized model magnets. These results were reflected in the design of a conduction-cooled 9.4 T REBCO magnet for whole-body MRI systems.</p>

    DOI: 10.2221/jcsj.52.224

  • Design and Test Results of Superconducting Magnet for Heavy-Ion Rotating Gantry Reviewed

    S. Takayama, K. Koyanagi, H. Miyazaki, S. Takami, T. Orikasa, Y. Ishii, T. Kurusu, Y. Iwata, K. Noda, T. Obana, K. Suzuki, T. Ogitsu, N. Amemiya

    Journal of Physics: Conference Series   871 ( 1 )   2017.7

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    DOI: 10.1088/1742-6596/871/1/012083

  • A conduction-cooled REBCO magnet with a single-stage GM cryocooler and a stainless steel case for storing the coil and covering it from thermal radiation Reviewed

    Sadanori Iwai, Hiroshi Miyazaki, Yasumi Otani, Taizo Tosaka, Kenji Tasaki, Shunji Nomura, Yusuke Ishii

    IEEE Transactions on Applied Superconductivity   27 ( 4 )   2017.6

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    DOI: 10.1109/TASC.2017.2674959

  • Screening-Current-Induced Magnetic Field of Conduction-Cooled HTS Magnets Wound with REBCO-Coated Conductors Reviewed

    Hiroshi Miyazaki, Sadanori Iwai, Tatsuro Uto, Yasumi Otani, Masahiko Takahashi, Taizo Tosaka, Kenji Tasaki, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, So Noguchi, Atsushi Ishiyama, Shin Ichi Urayama, Hidenao Fukuyama

    IEEE Transactions on Applied Superconductivity   27 ( 4 )   2017.6

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    DOI: 10.1109/TASC.2017.2657636

  • Progress in the Development of Conduction-Cooled REBCO Magnets for Ultrahigh-Field MRI Systems Reviewed

    Hiroshi Miyazaki, Sadanori Iwai, Tatsuro Uto, Yasumi Otani, Masahiko Takahashi, Taizo Tosaka, Kenji Tasaki, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, So Noguchi, Atsushi Ishiyama, Shin Ichi Urayama, Hidenao Fukuyama

    IEEE Transactions on Applied Superconductivity   27 ( 4 )   2017.6

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    DOI: 10.1109/TASC.2017.2656858

  • Numerical Evaluation on Irregular Field Generated by Screening Current in High-Field REBCO Coil for Whole-Body MRI Reviewed

    Kohei Nakazono, Hiroshi Ueda, Atsushi Ishiyama, So Noguchi, Hiroshi Miyazaki, Taizo Tosaka, Tsutomu Kurusu, Shunji Nomura, Shinichi Urayama, Hidenao Fukuyama

    IEEE Transactions on Applied Superconductivity   27 ( 4 )   2017.6

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    DOI: 10.1109/TASC.2016.2645839

  • Design and Test Results of a Cryogenic Cooling System for a 25-T Cryogen-Free Superconducting Magnet Reviewed

    Masahiko Takahashi, Sadanori Iwai, Hiroshi Miyazaki, Taizo Tosaka, Kenji Tasaki, Satoshi Hanai, Shigeru Ioka, Hiroyuki Takigami, Kazuo Watanabe, Satoshi Awaji, Hidetoshi Oguro, Yuji Tsuchiya

    IEEE Transactions on Applied Superconductivity   27 ( 4 )   2017.6

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    DOI: 10.1109/TASC.2017.2673762

  • First performance test of a 25 T cryogen-free superconducting magnet Reviewed

    Satoshi Awaji, Kazuo Watanabe, Hidetoshi Oguro, Hiroshi Miyazaki, Satoshi Hanai, Taizo Tosaka, Shigeru Ioka

    Superconductor Science and Technology   30 ( 6 )   2017.5

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    DOI: 10.1088/1361-6668/aa6676

  • Electromagnetic analysis on magnetic field and current distribution in high temperature superconducting thin tape in coil winding Reviewed

    Hiroshi Ueda, Seok Beom Kim, So Noguchi, Atsushi Ishiyama, Hiroshi Miyazaki, Sadanori Iwai, Taizo Tosaka, Shunji Nomura, Tsutomu Kurusu, Shinichi Urayama, Hidenao Fukuyama

    IEEE CEFC 2016 - 17th Biennial Conference on Electromagnetic Field Computation   2017.1

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    DOI: 10.1109/CEFC.2016.7816041

  • Optimal configuration design of MRI REBCO magnet taking into account superconducting layer Reviewed

    So Noguchi, Hiroshi Miyazaki, Taizo Tosaka, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, Atsushi Ishiyama, Shinichi Urayama, Hidenao Fukuyama

    IEEE CEFC 2016 - 17th Biennial Conference on Electromagnetic Field Computation   2017.1

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    DOI: 10.1109/CEFC.2016.7815982

  • Design of a conduction-cooled 9.4 T REBCO magnet for whole-body MRI systems Reviewed

    Hiroshi Miyazaki, Sadanori Iwai, Yasumi Otani, Masahiko Takahashi, Taizo Tosaka, Kenji Tasaki, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, So Noguchi, Atsushi Ishiyama, Shinichi Urayama, Hidenao Fukuyama

    Superconductor Science and Technology   29 ( 10 )   2016.8

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    DOI: 10.1088/0953-2048/29/10/104001

  • Evaluation of Magnetic Field Distribution by Screening Current in Multiple REBCO Coils Reviewed

    Ayumu Mochida, Hiroshi Ueda, So Noguchi, Tao Wang, Atsushi Ishiyama, Hiroshi Miyazaki, Taizo Tosaka, Shunji Nomura, Tsutomu Kurusu, Shinichi Urayama, Hidenao Fukuyama

    IEEE Transactions on Applied Superconductivity   26 ( 4 )   2016.6

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    DOI: 10.1109/TASC.2016.2542980

  • Testing of Stacked Pancake Coils for a Cryogen-Free 25-T Superconducting Magnet Reviewed

    H. Miyazaki, S. Iwai, T. Tosaka, K. Tasaki, H. Nezuka, S. Ioka, K. Watanabe, S. Awaji, H. Oguro, M. Daibo, Y. Iijima

    IEEE Transactions on Applied Superconductivity   26 ( 4 )   2016.6

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    DOI: 10.1109/TASC.2016.2530082

  • Study on Normal Zone Characteristics in a REBCO Insert Coil Induced by Quenches in an LTS Outsert Coil Reviewed

    Y. Tsuchiya, S. Muto, H. Oguro, S. Awaji, K. Watanabe, H. Miyazaki, S. Hanai, S. Ioka, M. Daibo, Y. Iijima

    IEEE Transactions on Applied Superconductivity   26 ( 4 )   2016.6

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    DOI: 10.1109/TASC.2016.2540918

  • RandD Project on HTS Magnets for Ultrahigh-Field MRI Systems Reviewed

    Taizo Tosaka, Hiroshi Miyazaki, Sadanori Iwai, Yasumi Otani, Masahiko Takahashi, Kenji Tasaki, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, So Noguchi, Atsushi Ishiyama, Shinichi Urayama, Hidenao Fukuyama

    IEEE Transactions on Applied Superconductivity   26 ( 4 )   2016.6

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    DOI: 10.1109/TASC.2016.2535863

  • Numerical Simulation on Magnetic Field Generated by Screening Current in 10-T-Class REBCO Coil Reviewed

    Hiroshi Ueda, Yohei Imaichi, Tao Wang, Atsushi Ishiyama, So Noguchi, Sadanori Iwai, Hiroshi Miyazaki, Taizo Tosaka, Shunji Nomura, Tsutomu Kurusu, Shinichi Urayama, Hidenao Fukuyama

    IEEE Transactions on Applied Superconductivity   26 ( 4 )   2016.6

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    DOI: 10.1109/TASC.2016.2535965

  • Experimental Results of Screening-Current Field with 10-T Class Small REBCO Coil Reviewed

    S. Iwai, H. Miyazaki, Y. Ohtani, T. Tosaka, K. Tasaki, S. Nomura, T. Kurusu, H. Ueda, S. Noguchi, A. Ishiyama, S. Urayama, H. Fukuyama

    IEEE Transactions on Applied Superconductivity   26 ( 4 )   2016.6

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    DOI: 10.1109/TASC.2016.2530301

  • Experiment and Simulation of Impregnated No-Insulation REBCO Pancake Coil Reviewed

    So Noguchi, Katsutoshi Monma, Sadanori Iwai, Hiroshi Miyazaki, Taizo Tosaka, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, Atsushi Ishiyama, Shinichi Urayama, Hidenao Fukuyama

    IEEE Transactions on Applied Superconductivity   26 ( 4 )   2016.6

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    DOI: 10.1109/TASC.2016.2536736

  • Evaluation of irregular magnetic field generated by screening current in REBCO coils for high accuracy field Reviewed

    Ayako Matsumi, Hiroshi Ueda, So Noguchi, Tao Wang, Atsushi Ishiyama, Hiroshi Miyazaki, Taizo Tosaka, Shunji Nomura, Tsutomu Kurusu, Shinichi Urayama, Hidenao Fukuyama

    IEEE Transactions on Applied Superconductivity   26 ( 4 )   2016.6

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    DOI: 10.1109/TASC.2016.2535966

  • R&amp;D Progress of HTS Magnet Project for Ultrahigh-field MRI Reviewed

    Taizo Tosaka, Hiroshi Miyazaki, Sadanori Iwai, Yasumi Otani, Masahiko Takahashi, Kenji Tasaki, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, So Noguchi, Atsushi Ishiyama, Shinichi Urayama, Hidenao Fukuyama

    Physics Procedia   81   145 - 148   2016.5

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    DOI: 10.1016/j.phpro.2016.04.034

  • 10 T generation by an epoxy impregnated GdBCO insert coil for the 25 T-cryogen-free superconducting magnet Reviewed

    Satoshi Awaji, Hidetoshi Oguro, Kazuo Watanabe, Satoshi Hanai, Hiroshi Miyazaki, Taizo Tosaka, Shigeru Ioka, Shinji Fujita, Masanori Daibo, Yasuhiro Iijima

    Superconductor Science and Technology   29 ( 5 )   2016.4

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    DOI: 10.1088/0953-2048/29/5/055010

  • Evaluation of Magnetic Field Homogeneity of a Conduction-Cooled REBCO Magnet with a Room-Temperature Bore of 200 mm Reviewed

    H. Miyazaki, S. Iwai, Y. Otani, M. Takahashi, T. Tosaka, K. Tasaki, S. Nomura, T. Kurusu, H. Ueda, S. Noguchi, A. Ishiyama, S. Urayama, H. Fukuyama

    IEEE Transactions on Applied Superconductivity   26 ( 3 )   2016.4

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    DOI: 10.1109/TASC.2016.2529841

  • Concept of a cryogenic system for a cryogen-free 25 T superconducting magnet Reviewed

    Sadanori Iwai, Masahiko Takahashi, Hiroshi Miyazaki, Taizo Tosaka, Kenji Tasaki, Satoshi Hanai, Shigeru Ioka, Kazuo Watanabe, Satoshi Awaji, Hidetoshi Oguro

    Physics Procedia   67   326 - 330   2015.7

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    DOI: 10.1016/j.phpro.2015.06.095

  • AC losses of an HTS insert in a 25-T cryogen-free superconducting magnet Reviewed

    S. Awaji, K. Kajikawa, K. Watanabe, H. Oguro, T. Mitose, S. Fujita, M. Daibo, Y. Iijima, H. Miyazaki, M. Takahashi, S. Ioka

    IEEE Transactions on Applied Superconductivity   25 ( 3 )   2015.6

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    DOI: 10.1109/TASC.2014.2366552

  • Project Overview of HTS Magnet for Ultra-high-field MRI System Reviewed

    Taizo Tosaka, Hiroshi Miyazaki, Sadanori Iwai, Yasumi Otani, Masahiko Takahashi, Kenji Tasaki, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, So Noguchi, Atsushi Ishiyama, Shinichi Urayama, Hidenao Fukuyama

    Physics Procedia   65   217 - 220   2015.6

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    DOI: 10.1016/j.phpro.2015.05.122

  • Evaluation of magnetic-field distribution by screening current in multiple REBCO coils Reviewed

    Hiroshi Ueda, Atsushi Ishiyama, Yuta Ariya, Tao Wang, Xudong Wang, Koh Agatsuma, Hiroshi Miyazaki, Taizo Tosaka, Shunji Nomura, Tsutomu Kurusu, Shinichi Urayama, Hidenao Fukuyama

    IEEE Transactions on Applied Superconductivity   25 ( 3 )   2015.6

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    DOI: 10.1109/TASC.2014.2371133

  • Development of saddle-shaped coils for accelerator magnets wound with YBCO-coated conductors Reviewed

    K. Koyanagi, S. Takayama, H. Miyazaki, T. Tosaka, K. Tasaki, T. Kurusu, Y. Ishii

    IEEE Transactions on Applied Superconductivity   25 ( 3 )   2015.6

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    DOI: 10.1109/TASC.2014.2385962

  • Design of a cooling system for a REBCO insert coil in a cryogen-free 25 T superconducting magnet Reviewed

    S. Iwai, M. Takahashi, H. Miyazaki, T. Tosaka, K. Tasaki, S. Hanai, S. Ioka, K. Watanabe, S. Awaji, H. Oguro

    IEEE Transactions on Applied Superconductivity   25 ( 3 )   2015.6

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    DOI: 10.1109/TASC.2014.2368713

  • Design of a REBCO insert coil for a cryogen-free 25-T superconducting magnet Reviewed

    H. Miyazaki, S. Iwai, M. Takahashi, T. Tosaka, K. Tasaki, S. Hanai, S. Ioka, K. Watanabe, S. Awaji, H. Oguro

    IEEE Transactions on Applied Superconductivity   25 ( 3 )   2015.6

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    DOI: 10.1109/TASC.2014.2380783

  • Delamination strengths of different types of REBCO-coated conductors and method for reducing radial thermal stresses of impregnated REBCO pancake coils Reviewed

    H. Miyazaki, S. Iwai, T. Tosaka, K. Tasaki, Y. Ishii

    IEEE Transactions on Applied Superconductivity   25 ( 3 )   2015.6

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    DOI: 10.1109/TASC.2014.2372048

  • Construction of a 25-T cryogen-free superconducting magnet Reviewed

    K. Watanabe, S. Awaji, H. Oguro, Y. Tsuchiya, S. Hanai, H. Miyazaki, T. Tosaka, M. Takahashi, S. Ioka

    Journal of Physics: Conference Series   568   2014.12

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    DOI: 10.1088/1742-6596/568/3/032019

  • Design of YBCO insert coil for a cryogen-free 22 T superconducting magnet Reviewed

    Hiroshi Miyazaki, Sadanori Iwai, Taizo Tosaka, Kenji Tasaki, Satoshi Hanai, Shigeru Ioka, Kazuo Watanabe, Satoshi Awaji, Hidetoshi Oguro, Shinji Fujita, Masanori Daibo, Yasuhiro Iijima

    IEEE Transactions on Applied Superconductivity   24 ( 3 )   2014.6

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    DOI: 10.1109/TASC.2013.2287059

  • Development of large-scale racetrack coil wound with REBCO-coated conductors Reviewed

    Sadanori Iwai, Hiroshi Miyazaki, Taizo Tosaka, Kenji Tasaki, Yusuke Ishii

    IEEE Transactions on Applied Superconductivity   24 ( 3 )   2014.6

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    DOI: 10.1109/TASC.2013.2284422

  • Degradation-free impregnated YBCO pancake coils by decreasing radial stress in the windings and method for evaluating delamination strength of YBCO-coated conductors Reviewed

    Hiroshi Miyazaki, Sadanori Iwai, Taizo Tosaka, Kenji Tasaki, Yusuke Ishii

    IEEE Transactions on Applied Superconductivity   24 ( 3 )   2014.6

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    DOI: 10.1109/TASC.2013.2287054

  • New 25 T Cryogen-Free Superconducting Magnet Project at Tohoku University Reviewed

    Satoshi Awaji, Kazuo Watanabe, Hidetoshi Oguro, Satoshi Hanai, Hiroshi Miyazaki, Masahico Takahashi, Shigeru Ioka, Masahiro Sugimoto, Hirokazu Tsubouchi, Shinji Fujita, Masanori Daibo, Yasuhiro Iijima, Hiroaki Kumakura

    IEEE Transactions on Applied Superconductivity   24 ( 3 )   2014.6

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    DOI: 10.1109/TASC.2013.2292367

  • Repairing and upgrading of the HTS insert in the 18T cryogen-free superconducting magnet Reviewed

    S. Awaji, H. Oguro, K. Watanabe, S. Hanai, S. Ioka, H. Miyazaki, M. Daibo, Y. Iijima, T. Saito, M. Itoh

    AIP Conference Proceedings   1573   732 - 738   2014.1

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    DOI: 10.1063/1.4860776

  • A 5.9 tesla conduction-cooled coil composed of a stack of four single pancakes wound with YBCO wide tapes Reviewed

    Sadanori Iwai, Hiroshi Miyazaki, Taizo Tosaka, Kenji Tasaki, Masami Urata, Shigeru Ioka, Yusuke Ishii

    Physica C: Superconductivity and its Applications   494   203 - 207   2013.11

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    DOI: 10.1016/j.physc.2013.04.068

  • RE系超電導伝導冷却コイルの開発:―シングルパンケーキ含浸コイルの熱暴走および機械特性の評価と解析― Reviewed

    宮﨑 寛史, 岩井 貞憲, 戸坂 泰造, 田﨑 賢司, 石井 祐介

    低温工学   48 ( 5 )   239 - 246   2013.6

  • コイル化技術に必要なRE系線材の特性把握:―許容剥離応力評価とコイルフラックスフロー特性の定量的予測― Reviewed

    岩井 貞憲, 宮﨑 寛史, 戸坂 泰造, 田﨑 賢司, 石井 祐介

    低温工学   48 ( 4 )   187 - 195   2013.5

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  • Development of a 5.1 T conduction-cooled YBCO coil composed of a stack of 12 single pancakes Reviewed

    Hiroshi Miyazaki, Sadanori Iwai, Taizo Tosaka, Kenji Tasaki, Satoshi Hanai, Masami Urata, Shigeru Ioka, Yusuke Ishii

    Physica C: Superconductivity and its Applications   484   287 - 291   2013.1

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    Language:Others   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.physc.2012.02.041

  • Research and development for upgrading a cryogen-free 18 T superconducting magnet Reviewed

    Kotaro Marukawa, Satoshi Hanai, Hiroshi Miyazaki, Kazuo Watanabe, Satoshi Awaji, Hidetoshi Oguro

    IEEE Transactions on Applied Superconductivity   22 ( 3 )   2012.6

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    DOI: 10.1109/TASC.2011.2179405

  • Thermal stability of conduction-cooled YBCO pancake coil Reviewed

    Hiroshi Miyazaki, Sadanori Iwai, Taizo Tosaka, Kenji Tasaki, Satoshi Hanai, Masami Urata, Shigeru Ioka, Yusuke Ishii

    IEEE Transactions on Applied Superconductivity   21 ( 3 PART 2 )   2453 - 2457   2011.6

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    DOI: 10.1109/TASC.2010.209012

  • Development of new cooling system using GM/JT cryocoolers for the SKS magnet Reviewed

    K. Aoki, T. Haruyama, Y. Makida, O. Araoka, K. Kasami, T. Takahashi, T. Nagae, Y. Kakiguchi, M. Sekimoto, T. Tosaka, H. Miyazaki, T. Kuriyama, M. Ono, T. Orikasa, T. Tsuchihashi, Y. Hirata

    AIP Conference Proceedings   985   349 - 356   2008.3

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    DOI: 10.1063/1.2908567

  • Numerical simulation of thermal properties of a cryocooler-cooled Bi2223 superconducting pulsed coil in AC operation Reviewed

    H. Miyazaki, S. Chigusa, I. Tanaka, M. Iwakuma, K. Funaki, H. Hayashi, A. Tomioka

    IEEE Transactions on Applied Superconductivity   16 ( 2 )   1749 - 1752   2006.6

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    DOI: 10.1109/TASC.2006.873266

  • Thermal analysis of cryocooler-cooled Bi2223 pulsed coil Reviewed

    H. Miyazaki, S. Chigusa, I. Tanaka, M. Iwakuma, K. Funaki, H. Hayashi, A. Tomioka

    Journal of Physics: Conference Series   43 ( 1 )   1051 - 1054   2006.6

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    DOI: 10.1088/1742-6596/43/1/257

  • Numerical simulation of thermal properties of Bi2223 conduction-cooled pulse coil for SMES Reviewed

    M. Iwakuma, H. Miyazaki, I. Tanaka, S. Chigusa, K. Funaki, A. Tomioka, H. Hayashi

    IEEE Transactions on Applied Superconductivity   16 ( 2 )   1757 - 1760   2006.6

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    DOI: 10.1109/TASC.2006.873268

  • Initiation of thermal runaway in a 1 T cryocooler-cooled oxide superconducting pulsed coil in AC operation Reviewed

    H. Miyazaki, S. Harada, M. Iwakuma, K. Funaki, H. Hayashi, A. Tomioka

    Physica C: Superconductivity and its Applications   426-431 ( II )   1397 - 1401   2005.7

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    DOI: 10.1016/j.physc.2005.03.074

  • Thermal runaway of a 1 T cryocooler-cooled oxide superconducting pulsed coil in Ac operation Reviewed

    H. Miyazaki, S. Harada, M. Iwakuma, K. Funaki, H. Hayashi, A. Tomioka

    IEEE Transactions on Applied Superconductivity   15 ( 2 PART II )   1663 - 1666   2005.6

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    DOI: 10.1109/TASC.2005.849226

  • Ac loss and thermal runaway of 1 T cryocooler-cooled oxide superconducting pulsed coil Reviewed

    H. Miyazaki, A. Iwamoto, M. Iwakuma, K. Funaki, H. Hayashi, A. Tomioka

    IEEE Transactions on Applied Superconductivity   14 ( 2 )   774 - 777   2004.6

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    DOI: 10.1109/TASC.2004.830106

  • Ac loss properties of a 4 kJ conduction-cooled pulse coil wound with a Bi2223 6-strand parallel conductor for SMES Reviewed

    M. Iwakuma, H. Miyazaki, Y. Fukuda, K. Kajikawa, K. Funaki, K. Tsutsumi, H. Hayashi, H. Kimura, A. Tomioka, T. Bohno, Y. Yagi

    IEEE Transactions on Applied Superconductivity   13 ( 2 II )   1882 - 1885   2003.6

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    DOI: 10.1109/TASC.2003.812938

  • Feasibility study of oxide superconducting transformers for Shinkansen rolling stock Reviewed

    Masataka Iwakuma, Kentaro Matsumura, Hiroshi Miyazaki, Kazuhiro Kajikawa, Kazuo Funaki, Hiroshi Hata, Hiroyuki Fujimoto, Hiroki Kamijo

    IEEE Transactions on Applied Superconductivity   12 ( 1 )   828 - 832   2002.3

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    DOI: 10.1109/TASC.2002.1018529

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Books

Presentations

  • Fabrication and test of a 400 kW-class fully superconducting synchronous motor using REBCO tape for an electric propulsion system Invited International conference

    H. Miyazaki, M. Iwakuma, S. Sasa, S. Miura, K. Yoshida, S. Sato, I. Sagara, Y. Suzuki, M. Konno, H. Hirai, T. Izumi

    International Conference on Magnet Technology 28  2023.9 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

  • High efficiency and high power electric propulsion system for airplane by superconductivity Development of a REBCO fully superconducting motor and cooling system Invited International conference

    H. Miyazaki, M. Iwakuma, S. Miura, H. SASA, K. Yoshida, S. Sato, I. Sagara, @Y. Hase, @M. Konno, @Y. Sasamori, @H. Honda, @T. Okabe, @H. HIRAI, @S. Lee, @S. Hasuo, @M. Nakamura, @N. Mido, @K. Adachi, @K. Shiohara, @T. Izumi, @A. Kawagoe, @M. Deki, @H. Amano, @Y. Kawaguchi, @T. Yamasaki

    Applied Superconductivity Conference 2022  2022.10 

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    Event date: 2022.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  • 交流損失予測に基づく電磁界・熱連成解析による電動航空機用REBCO全超伝導同期機の設計

    佐々 滉太, 三浦 峻, 宮﨑 寛史, 岩熊 成卓

    第106回 低温工学・超電導学会研究発表会  2023.12 

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    Event date: 2023.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:下関   Country:Japan  

  • Development of Fully Superconducting Propulsion System for Aircraft with REBCO Tapes Invited International conference

    Masataka Iwakuma, Hiroshi Miyazaki, Shun Miura, Hiromasa Sasa, Seiki Sato, Koichi Yoshida, Yoshiaki Suzuki, Isamu Sagara, Yoshiji Hase, Masayuki Konno, Mitsuo Ohaku, Chinatsu Ikeda, Hirokazu Honda, Yuichiro Sasamori, Teruo Izumi, Takato Machi, Hishiro Hirose, Sergey Lee, Shinya Hasuo, Miyuki Nakamura, Hirokazu Hirai, Nobuhiro Midoh, Kazuhisa Adachi, Yuji Aoki, Kei Shiohara, Hidetoshi Kasahara

    International Symposium on Superconductivity 2023  2023.11 

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

  • Electromagnetic design for high power density of fully superconducting synchronous motor with through-shaft type field coil for electric aircraft International conference

    #Kaiji Uriu, Masataka Iwakuma, Hiroshi Miyazaki, Shun Miura, Hiromasa Sasa

    International Symposium on Superconductivity 2023  2023.11 

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

  • Influence of magnetic shields on current distributions among REBCO parallel conductors in single-phase armature windings International conference

    Shun Miura, Yohei Masuda, Kazuki Nakamura, Goki Kawasaki, Hiroshi Miyazaki, Akifumi Kawagoe, Hiromasa Sasa, Koichi Yoshida, Seiki Sato, Masataka Iwakuma

    International Symposium on Superconductivity 2023  2023.11 

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

  • Estimation Method of AC Loss of REBCO Superconducting Tapes in AC+DC Field for Field Windings in Fully Superconducting Synchronous Machine for Electric Aircraft International conference

    Hiromasa Sasa, Koudai Jingami, Ryoma Oishi, Shun Miura, Hiroshi Miyazaki, Masataka Iwakuma

    International Symposium on Superconductivity 2023  2023.11 

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

  • Current Distribution among Three-Parallel REBa2Cu3Oy wires in Three-phase Armature Coils International conference

    Shun Miura, Asato Kobun, Yohei Masuda, Kazuki Nakamura, Hiroshi Miyazaki, Akifumi Kawagoe, Hiromasa Sasa, Koichi Yoshida, Seiki Sato, Masataka Iwakuma

    International Conference on Magnet Technology 28  2023.9 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

  • Effectiveness of REBCO Trapezoidal Armature Coils Used in Superconducting Induction Motors International conference

    #M. Tsumori, R. Yamasaki, Y. Okade, H. Miyazaki, S. Miura, H. Sasa, K. Yoshida, M. Iwakuma

    International Conference on Magnet Technology 28  2023.9 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

  • Electromagnetic design of a REBCO four-pole full-pitched armature coil composed of trapezoidal windings for fully superconducting synchronous motors International conference

    #Y. Emori, H. Miyazaki, S. Miura, H. Sasa, M. Iwakuma

    International Conference on Magnet Technology 28  2023.9 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

  • Evaluation of the AC loss characteristics of multifilamentary REBCO tapes by the mechanical scratching of MgO2 areas International conference

    #R. Oishi, K. Jingami, H. Miyazaki, M. Iwakuma, K. Yoshida, S. Miura, H. Sasa, M. Daibo, S. Fujita

    International Conference on Magnet Technology 28  2023.9 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

  • Current Distribution in Armature Coils Comprising Two Sizes of Racetrack Double-Pancakes with REBCO Striated Tapes International conference

    #A. Takashima, H. Miyazaki, S. Miura, K. Yoshida, S. Sato, H. Sasa, M. Iwakuma

    International Conference on Magnet Technology 28  2023.9 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

  • Current Distribution among Transposed Eight-bundle REBCO Wires in Armature Coils International conference

    Shun Miura, Asato Kobun, Yohei Masuda, Kazuki Nakamura, Hiroshi Miyazaki, Akifumi Kawagoe, Hiromasa Sasa, Koichi Yoshida, Seiki Sato, Masataka Iwakuma

    16th European Conference on Applied Superconductivity  2023.9 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Italy  

  • Progress in the development of high-efficiency electric propulsion systems Invited International conference

    Masataka Iwakuma, Hiroshi Miyazaki, Shun Miura, Hiromasa Sasa, Seiki Sato, Koichi Yoshida, Yoshiaki Suzuki, Isam Sagara, Yoshiji Hase, Masayuki Konno, Mitsuo Ohaku, Chinatsu Ikeda, Hirokazu Honda, Yuichiro Sasamori, Teruo Izumi, Takato Machi, Hishiro Hirose, Sergey Lee, Shinya Hasuo, Miyuki Nakamura, Hirokazu Hirai, Nobuhiro Midoh, Kazuhisa Adachi, Yuji Aoki, Kei Shiohara, Hidetoshi Kasahara

    16th European Conference on Applied Superconductivity  2023.9 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Italy  

  • 大小2種類のREBCOダブルパンケーキコイルを組み合わせた電機子コイルの電流分流特性

    #高島 敦史, 宮崎 寛史, 川越 明史, 三浦 峻, 吉田 幸市, 佐藤 誠樹, 佐々 滉太, 岩熊 成卓

    第105回 低温工学・超電導学会研究発表会  2023.5 

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    Event date: 2023.5 - 2023.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京   Country:Japan  

  • 電機子コイルにおけるREBa2Cu3Oy並列導体の素線間電流分流の簡易解析手法

    三浦 峻, 公文 麻人, 増田 陽平, 中村 一稀, 宮﨑 寛史, 川越 明史,吉田 幸市, 佐藤 誠樹, 佐々 滉太, 岩熊 成卓

    第105回 低温工学・超電導学会研究発表会  2023.5 

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    Event date: 2023.5 - 2023.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京   Country:Japan  

  • 大小2種類のREBCOダブルパンケーキコイルを組み合わせた電機子コイルの電流分流特性

    #高島 敦史, 宮崎 寛史, 川越 明史, 三浦 峻, 吉田 幸市, 佐藤 誠樹, 佐々 滉太, 岩熊 成卓

    第105回 低温工学・超電導学会研究発表会  2023.5 

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    Event date: 2023.5 - 2023.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京   Country:Japan  

  • 電機子コイルにおけるREBa2Cu3Oy並列導体の素線間電流分流の簡易解析手法

    三浦 峻, 公文 麻人, 増田 陽平, 中村 一稀, 宮﨑 寛史, 川越 明史,吉田 幸市, 佐藤 誠樹, 佐々 滉太, 岩熊 成卓

    第105回 低温工学・超電導学会研究発表会  2023.5 

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    Event date: 2023.5 - 2023.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京   Country:Japan  

  • 転位並列導体で構成した全超伝導回転機の電機⼦コイル向けREBCOレーストラック型ダブルパンケーキコイルにおける均流化コンセプトの実験的評価

    #公文 麻人, #増田 陽平, #山﨑 亮斗、#岡出 祐汰、三浦 峻, 宮﨑 寛史, 吉田 幸市, 佐藤 誠樹, 佐々 滉太,岩熊 成卓

    2022年度秋季第104回 低温工学・超電導学会研究発表会  2022.12 

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    Event date: 2022.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岐阜   Country:Japan  

  • 台形コイルを用いた超伝導誘導機の電磁解析

    #山崎 亮斗, #岡出 祐汰, 宮崎 寛史,吉田 幸市, 佐々 滉太, 三浦 峻, 岩熊 成卓

    2022年度秋季第104回 低温工学・超電導学会研究発表会  2022.12 

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    Event date: 2022.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岐阜   Country:Japan  

  • 転位並列導体で構成した全超伝導回転機の電機子コイルの大電流容量化に関する研究

    #公文 麻人, #増田 陽平, 三浦 峻, 宮﨑 寛史, 吉田 幸市, 佐藤 誠樹,佐々 滉太, 岩熊 成卓

    九州・西日本支部 2022年度若手セミナー・支部研究成果発表会  2022.11 

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    Event date: 2022.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鹿児島   Country:Japan  

  • Electromagnetic Design of a 400 kW REBCO Fully Superconducting Synchronous Motor for Airplane by Finite Element Method Analysis International conference

    Hiromasa Sasa, Hiroshi Miyazaki, Shun Miura, Koichi Yoshida, Seiki Sato, #Yuta Okade, Isamu Sagara, Masataka Iwakuma, @Masayuki Konno, @Yoshiji Hase, @Yuichiro Sasamori, @Hirokazu Hirai, @Shinya Hasuo, @Teruo Izumi

    Applied Superconductivity Conference 2022  2022.10 

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    Event date: 2022.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  • Current Distributions of Multi-strand Parallel Conductors Composed of REBa2Cu3Oy Superconducting Tapes International conference

    S. Miura, #A. Kobun, A. Takashima, H. Sasa, H. Miyazaki, A. Kawagoe, M. Iwakuma

    Applied Superconductivity Conference 2022  2022.10 

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    Event date: 2022.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  • AC loss characteristics of stacked REBCO double pancake coils cooled by liquid nitrogen International conference

    #K. Jingami, H. Miyazaki, M. Iwakuma, S. Miura, H. Sasa, #W. Akaike, #R. Oishi, K. Yoshida

    Applied Superconductivity Conference 2022  2022.10 

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    Event date: 2022.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  • Basic Concept for Uniform Current Distribution in Parallel Conductors by Introducing a Small Number of Transpositions in REBCO Armature Coils for Fully-Superconducting Rotating Machines International conference

    2022.10 

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    Event date: 2022.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:HONOLULU   Country:United States  

  • Current Distribution of Armature Coils Combining Two Different Sizes of REBCO Racetrack Double Pancakes International conference

    #A. Takashima, #Y. Omanyuda, #A. Kobun, H. Miyazaki, A. Kawagoe, S. Miura, K. Yoshida, S. Sato, H. Sasa, and M. Iwakuma

    Applied Superconductivity Conference 2022  2022.10 

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    Event date: 2022.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  • 電気推進システム用限流機能付き10 MVA-6.9/1.0 kV 超伝導変圧器の軽量化検討

    #尾形桐弥,岩熊成卓,宮崎寛史, 三浦峻, 佐々滉太, #中野基貴

    第75回電気・情報関係学会九州支部連合大会  2022.9 

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    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • 航空機用超伝導動機モータのロータ径と出力密度の関係

    #淺田基寛, 宮崎寛史,岩熊成卓,佐々滉太, 三浦峻, #國安天斗

    第75回電気・情報関係学会九州支部連合大会  2022.9 

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    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • REBCO超伝導線材を用いた2層パンケーキコイルの液体窒素冷却による交流損失評価 International conference

    #赤池航, 岩熊成卓, 宮崎寛史, 三浦峻, 佐々滉太, #陣上広大, #大石遼真, @藤田真司, @大保雅載

    第75回電気・情報関係学会九州支部連合大会  2022.9 

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    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • 伝導冷却 REBCO コイルの磁化緩和特性 Invited

    宮﨑 寛史

    第3回材料研究会/九州・西日本支部合同研究会  2021.11 

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    Event date: 2021.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • 1D-CAEを用いた冷凍機冷却超電導磁石の熱設計

    上野航生, 酒井康幸, 栗山透, 高橋政彦, 宮崎寛史, 折笠朝文, 平井要

    2021年度春季低温工学・超電導学会  2021.5 

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    Event date: 2021.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • 導電性樹脂によるコイル保護機能を備えた高温超電導MRIマグネット(1)-設計,試作-

    岩井貞憲, 宇都達郎, 宮崎寛史, 草野貴史, 伊藤智庸, 野村俊自, 石井宏尚

    2021年度春季低温工学・超電導学会  2021.5 

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    Event date: 2021.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • 導電性樹脂によるコイル保護機能を備えた高温超電導MRIマグネット(2)-磁場均一度評価及び磁場補正結果-

    宇都達郎, 岩井貞憲, 宮崎寛史, 草野貴史, 伊藤智庸, 野村俊自, 石井宏尚

    2021年度春季低温工学・超電導学会  2021.5 

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    Event date: 2021.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

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MISC

  • Analysis of Fault Current Limiting Function of 10MVA-6.9/1.0kV Superconducting Transformer for Electric Aircraft under Three Phase Short Circuit

    Record of Joint Conference of Electrical and Electronics Engineers in Kyushu   2023   347 - 348   2023.8

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    Language:Japanese   Publisher:Committee of Joint Conference of Electrical, Electronics and Information Engineers in Kyushu  

    DOI: 10.11527/jceeek.2023.0_347

    CiNii Research

    researchmap

  • Calculation of Uniform Current Distribution Method for Three Parallel Conductors Applied to Armature Coils of Superconducting Synchronous Motors for Electric Aircraft

    Record of Joint Conference of Electrical and Electronics Engineers in Kyushu   2023   447 - 447   2023.8

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    Language:Japanese   Publisher:Committee of Joint Conference of Electrical, Electronics and Information Engineers in Kyushu  

    DOI: 10.11527/jceeek.2023.0_447

    CiNii Research

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  • Examination of the primary side coil of a superconducting linear synchronous motor for the purpose of gliding a flying car.

    Record of Joint Conference of Electrical and Electronics Engineers in Kyushu   2023   214 - 214   2023.8

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    Language:Japanese   Publisher:Committee of Joint Conference of Electrical, Electronics and Information Engineers in Kyushu  

    DOI: 10.11527/jceeek.2023.0_214

    CiNii Research

    researchmap

  • Consideration on Weight Reduction and AC loss of 10MVA-6.9/1.0kV Superconducting Transformer for Aircraft Using REBCO Wire Rods

    Record of Joint Conference of Electrical and Electronics Engineers in Kyushu   2022   108 - 108   2022.9

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    Language:Japanese   Publisher:Committee of Joint Conference of Electrical, Electronics and Information Engineers in Kyushu  

    DOI: 10.11527/jceeek.2022.0_108

    CiNii Research

    researchmap

  • Relationship between Rotor Diameter and Power Density of 2MW All-Superconducting Synchronous Motor for Electric Aircraft

    Record of Joint Conference of Electrical and Electronics Engineers in Kyushu   2022   109 - 109   2022.9

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    Language:Japanese   Publisher:Committee of Joint Conference of Electrical, Electronics and Information Engineers in Kyushu  

    DOI: 10.11527/jceeek.2022.0_109

    CiNii Research

    researchmap

Industrial property rights

Patent   Number of applications: 18   Number of registrations: 18
Utility model   Number of applications: 0   Number of registrations: 0
Design   Number of applications: 0   Number of registrations: 0
Trademark   Number of applications: 0   Number of registrations: 0

Professional Memberships

  • CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

  • THE INSTITUTE OF ELECTRICAL ENGINEERS OF JAPAN

  • THE INSTITUTE OF ELECTRICAL ENGINEERS OF JAPAN

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  • CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

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Committee Memberships

  • 低温工学・超電導学会 九州・西日本支部   庶務幹事   Domestic

    2022.4 - 2024.3   

Academic Activities

  • Deputy-Chair International contribution

    International Symposium on Superconductivity (ISS2024)  ( Japan ) 2024.4 - 2025.3

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    Type:Competition, symposium, etc. 

  • 委員

    第8回超電導スクール  ( 東京 ) 2023.4 - 2024.3

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    Type:Competition, symposium, etc. 

  • Deputy-Chair International contribution

    International Symposium on Superconductivity (ISS2023)  ( WELLINGTON NewZealand ) 2023.4 - 2024.3

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    Type:Competition, symposium, etc. 

  • Program Committee International contribution

    Coated Conductors for Applications Workshop  ( Houston UnitedStatesofAmerica ) 2023.4

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    Type:Competition, symposium, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2023

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:1

  • Deputy-Chair International contribution

    International Symposium on Superconductivity (ISS2022)  ( Japan ) 2022.4 - 2023.3

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    Type:Competition, symposium, etc. 

  • 委員

    第7回超電導スクール  2022.4 - 2023.3

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    Type:Competition, symposium, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2022

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:3

    Number of peer-reviewed articles in Japanese journals:1

  • 委員

    第6回超電導スクール  2021.4 - 2022.3

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    Type:Competition, symposium, etc. 

  • Deputy-Chair International contribution

    International Symposium on Superconductivity (ISS2021)  ( Japan ) 2021.4 - 2022.3

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    Type:Competition, symposium, etc. 

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Research Projects

  • 高温超電導線材接合技術の超高磁場NMRと鉄道き電線への社会実装

    2024.4 - 2027.3

  • 高温超電導線材接合技術の超高磁場NMRと鉄道き電線への社会実装

    2024 - 2026

    JST 未来社会創造事業

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    Authorship:Coinvestigator(s)  Grant type:Contract research

  • 磁気冷凍機用超伝導マグネットの研究開発

    2024 - 2025

    JST 未来社会創造事業

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    Authorship:Principal investigator  Grant type:Contract research

  • 空飛ぶクルマ用高出力密度超伝導誘導モータの研究開発

    2023.4 - 2026.3

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    Authorship:Coinvestigator(s) 

  • REBCO高温超電導線材、およびコイルの交流損失に関する研究

    2023.1 - 2023.3

    共同研究

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    Authorship:Principal investigator  Grant type:Other funds from industry-academia collaboration

  • 空飛ぶクルマ用高出力密度超伝導誘導モータの研究開発

    Grant number:23H00187  2023 - 2026

    日本学術振興会  科学研究費助成事業  基盤研究(A)

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 磁気冷凍機用超伝導マグネットの研究開発

    2023 - 2024

    JST 未来社会創造事業

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    Authorship:Principal investigator  Grant type:Contract research

  • REBCO高温超電導線材、およびコイルの交流損失に関する研究

    2022.7 - 2022.9

    共同研究

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    Authorship:Principal investigator  Grant type:Other funds from industry-academia collaboration

  • 磁気冷凍技術による革新的水素液化システムの開発

    2022.4 - 2028.3

  • 磁気冷凍機用超伝導マグネットの研究開発

    2022 - 2023

    JST 未来社会創造事業

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    Authorship:Principal investigator  Grant type:Contract research

  • NEDO 航空機用先進システム実用化プロジェクト 次世代電動推進システム研究開発 高効率かつ高出力電動推進システム 「革新的航空機用電気推進システムの研究開発」

    2021.4 - 2024.3

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    Authorship:Coinvestigator(s) 

  • JST ALCA 「REBCO超伝導線材を用いた全超伝導回転機の開発」

    2021.4 - 2021.9

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    Authorship:Coinvestigator(s) 

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Class subject

  • Advanced Superconducting Applications II

    2024.6 - 2024.8   Summer quarter

  • 超伝導応用特論Ⅱ

    2024.6 - 2024.8   Summer quarter

  • 電気電子工学演示Ⅰ

    2024.4 - 2024.9   First semester

  • 電気電子工学読解Ⅰ

    2024.4 - 2024.9   First semester

  • Advanced Superconducting Applications I

    2024.4 - 2024.6   Spring quarter

  • 超伝導応用特論Ⅰ

    2024.4 - 2024.6   Spring quarter

  • 回路理論Ⅳ(EE)

    2023.12 - 2024.2   Winter quarter

  • 電気電子工学演示Ⅱ

    2023.10 - 2024.3   Second semester

  • (後期)回路理論Ⅲ(A)

    2023.10 - 2024.3   Second semester

  • 電気電子工学読解Ⅱ

    2023.10 - 2024.3   Second semester

  • 回路理論Ⅲ(EE)

    2023.10 - 2023.12   Fall quarter

  • 基幹教育セミナー

    2023.6 - 2023.8   Summer quarter

  • 超伝導応用特論Ⅱ

    2023.6 - 2023.8   Summer quarter

  • Advanced Superconducting Applications II

    2023.6 - 2023.8   Summer quarter

  • 電気電子工学特別研究Ⅰ

    2023.4 - 2024.3   Full year

  • 電気電子工学特別研究Ⅱ

    2023.4 - 2024.3   Full year

  • Advanced Seminar in Electrical and Electronic Engineering

    2023.4 - 2024.3   Full year

  • Advanced Research in Electrical and Electronic Engineering I

    2023.4 - 2024.3   Full year

  • Advanced Research in Electrical and Electronic Eng II

    2023.4 - 2024.3   Full year

  • 超伝導材料物性特別講究

    2023.4 - 2024.3   Full year

  • Advanced Research in Superconducting Materials

    2023.4 - 2024.3   Full year

  • 電気電子工学特別演習

    2023.4 - 2024.3   Full year

  • 電気電子工学読解Ⅰ

    2023.4 - 2023.9   First semester

  • 電気電子工学演示Ⅰ

    2023.4 - 2023.9   First semester

  • 超伝導応用特論Ⅰ

    2023.4 - 2023.6   Spring quarter

  • Advanced Superconducting Applications I

    2023.4 - 2023.6   Spring quarter

  • 回路理論Ⅳ(EE)

    2022.12 - 2023.2   Winter quarter

  • 電気電子工学読解Ⅱ

    2022.10 - 2023.3   Second semester

  • 電気電子工学演示Ⅱ

    2022.10 - 2023.3   Second semester

  • (後期)回路理論Ⅲ(A)

    2022.10 - 2023.3   Second semester

  • 回路理論Ⅲ(EE)

    2022.10 - 2022.12   Fall quarter

  • 超伝導応用特論Ⅱ

    2022.6 - 2022.8   Summer quarter

  • 国際演示技法

    2022.4 - 2023.3   Full year

  • 知的財産技法

    2022.4 - 2023.3   Full year

  • ティーチング演習

    2022.4 - 2023.3   Full year

  • 先端プロジェクト管理技法

    2022.4 - 2023.3   Full year

  • Scientific English Presentation

    2022.4 - 2023.3   Full year

  • Intellectual Property Management

    2022.4 - 2023.3   Full year

  • Exercise in Teaching

    2022.4 - 2023.3   Full year

  • Advanced Project Management Technique

    2022.4 - 2023.3   Full year

  • 電気電子工学演示Ⅰ

    2022.4 - 2022.9   First semester

  • 電気電子工学読解Ⅰ

    2022.4 - 2022.9   First semester

  • 超伝導応用特論Ⅰ

    2022.4 - 2022.6   Spring quarter

  • 電気情報工学入門

    2022.4 - 2022.6   Spring quarter

  • 電気電子工学読解Ⅱ

    2021.10 - 2022.3   Second semester

  • 電気電子工学読解Ⅰ

    2021.4 - 2021.9   First semester

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FD Participation

  • 2023.11   Role:Participation   Title:【シス情FD】企業等との共同研究の実施増加に向けて

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2023.4   Role:Participation   Title:【シス情FD】若手教員による研究紹介⑧

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2023.1   Role:Participation   Title:【シス情FD】若手教員による研究紹介⑦

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2022.4   Role:Participation   Title:【シス情FD】第4期中期目標・中期計画等について

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2022.1   Role:Participation   Title:【シス情FD】シス情関連の科学技術に対する国の政策動向(に関する私見)

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2021.12   Role:Speech   Title:【シス情FD】企業出身教員から見た大学

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2021.10   Role:Participation   Title:【シス情FD】熊本高専と九大システム情報との交流・連携に向けて ー 3年半で感じた高専の実像 ー

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2021.7   Role:Participation   Title:若手教員による研究紹介 及び 科研取得のポイント、その他について ②

    Organizer:[Undergraduate school/graduate school/graduate faculty]

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Participation in international educational events, etc.

  • 2022.12

    九州大学

    UQ-JPIEプログラム

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    Venue:日本・福岡

Other educational activity and Special note

  • 2022  Class Teacher 

Social Activities

  • 「SS課題探究I・II」課題研究活動への講義、指導助言

    神奈川県立相模原高等学校  2022.9

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    Audience: Infants, Schoolchildren, Junior students, High school students

    Type:Seminar, workshop

  • 電動航空機と飛ぶ車の研究開発

    九州大学 オープンキャンパス  九州大学  2022.8

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    Audience: General, Scientific, Company, Civic organization, Governmental agency

  • 不明

    主催:公益社団法人 低温工学・超電導学会  福岡市科学館  2021.11

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    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

    子どもたちや一般の方々を対象に「超電導」や「極低温」という先端科学技術を紹介し、科学への理解や興味を深めることを目的とする。学校の授業などでは触れることのできない多数の実験を用意し、リニアモーターカーや医療用MRIなどの基礎となる現象を体感するとともに、講演によってその背景や原理について理解を深めてもらう。

  • 電動航空機と飛ぶ車の研究開発

    九州大学 オープンキャンパス  九州大学  2021.8

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    Audience: General, Scientific, Company, Civic organization, Governmental agency

Media Coverage

  • 【九州大、電動飛行機に超電導モーター 30年代に試験飛行】https://www.nikkei.com/article/DGXZQOUC214CA0R20C23A9000000/ Newspaper, magazine

    日本経済新聞  2023.10

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    【九州大、電動飛行機に超電導モーター 30年代に試験飛行】https://www.nikkei.com/article/DGXZQOUC214CA0R20C23A9000000/

  • 【「超電導モーター」で世界に先駆ける…次世代航空機の競争力確保、経産省が開発支援】https://newswitch.jp/p/39047 Newspaper, magazine

    ニュースイッチ  2023.10

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    【「超電導モーター」で世界に先駆ける…次世代航空機の競争力確保、経産省が開発支援】https://newswitch.jp/p/39047

  • 【次世代航空機 競争力確保 超電導モーターで推進系 経産省】 Newspaper, magazine

    日刊工業新聞  2023.10

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    【次世代航空機 競争力確保 超電導モーターで推進系 経産省】

  • ロクいち!福岡【世界初!航空機向け超電導技術用いたモーター回転試験に成功】https://www3.nhk.or.jp/fukuoka-news/20230725/5010021321.html TV or radio program

    2023.7

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    ロクいち!福岡【世界初!航空機向け超電導技術用いたモーター回転試験に成功】https://www3.nhk.or.jp/fukuoka-news/20230725/5010021321.html

  • 【次世代電動航空機向け400kW級全超電導モータの回転試験に世界で初めて成功】https://www.kyushu-u.ac.jp/ja/notices/view/2475/

    九州大学ニュースリリース  2023.6

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    【次世代電動航空機向け400kW級全超電導モータの回転試験に世界で初めて成功】https://www.kyushu-u.ac.jp/ja/notices/view/2475/

  • 【空飛ぶクルマへの適用目指す 九大が次世代航空機向けモータの回転試験に世界初成功】https://www.zakzak.co.jp/article/20230611-S3CARWTCAVPFTI7GHA2QTOQT6E/ Newspaper, magazine

    ZAKZAK(産業経済新聞)  2023.6

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    【空飛ぶクルマへの適用目指す 九大が次世代航空機向けモータの回転試験に世界初成功】https://www.zakzak.co.jp/article/20230611-S3CARWTCAVPFTI7GHA2QTOQT6E/

  • 【九州大学、次世代電動航空機向け400kW級全超電導モータの回転試験に世界初成功】https://www.drone.jp/news/2023060915420467765.html Newspaper, magazine

    2023.6

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    【九州大学、次世代電動航空機向け400kW級全超電導モータの回転試験に世界初成功】https://www.drone.jp/news/2023060915420467765.html

  • 【九州大学など 次世代電動航空機向け全超電導モーター 回転試験に世界初成功】 Newspaper, magazine

    電波新聞  2023.6

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    【九州大学など 次世代電動航空機向け全超電導モーター 回転試験に世界初成功】

  • 【次世代電動航空機向け400kW級全超電導モータの回転試験に世界で初めて成功】https://www.kyushu-u.ac.jp/ja/notices/view/2475/

    九州大学ニュースリリース  2023.6

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    【次世代電動航空機向け400kW級全超電導モータの回転試験に世界で初めて成功】https://www.kyushu-u.ac.jp/ja/notices/view/2475/

  • 【次世代電動航空機向け 400kW 級全超電導モータの回転試験に世界で初めて成功】

    九州大学定例記者会見  2023.6

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    【次世代電動航空機向け 400kW 級全超電導モータの回転試験に世界で初めて成功】

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