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

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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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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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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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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Publisher：Journal of Physics: Conference Series  

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

Scopus

Publisher：Journal of Physics: Conference Series  

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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Publisher：Journal of Physics: Conference Series  

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

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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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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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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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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A large AC loss is generated in armature windings composed of a REBa<sub>2</sub>Cu<sub>3</sub>O<sub><i>y</i></sub> (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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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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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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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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We investigated current distribution in three-strand transposed parallel conductors consisting of REBa<sub>2</sub>Cu<sub>3</sub>O<sub>y</sub> (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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DOI： 10.1109/TASC.2021.3059604

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DOI： 10.1109/TASC.2021.3061896

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DOI： 10.1109/TASC.2021.3069685

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DOI： 10.1109/TASC.2020.2991260

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DOI： 10.1088/1742-6596/1559/1/012114

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DOI： 10.1109/TASC.2019.2906978

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DOI： 10.1109/TASC.2019.2909795

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DOI： 10.1109/TASC.2019.2898699

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DOI： 10.1109/TASC.2019.2906406

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DOI： 10.1109/TASC.2018.2809601

Language：Japanese  

<p>A project for developing of RE₁Ba₂Cu₃O_7-&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

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DOI： 10.1088/1742-6596/871/1/012083

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DOI： 10.1109/TASC.2017.2674959

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DOI： 10.1109/TASC.2017.2657636

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DOI： 10.1109/TASC.2017.2656858

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DOI： 10.1109/TASC.2016.2645839

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DOI： 10.1109/TASC.2017.2673762

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DOI： 10.1088/1361-6668/aa6676

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DOI： 10.1109/CEFC.2016.7816041

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DOI： 10.1109/CEFC.2016.7815982

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DOI： 10.1088/0953-2048/29/10/104001

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DOI： 10.1109/TASC.2016.2542980

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DOI： 10.1109/TASC.2016.2530082

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DOI： 10.1109/TASC.2016.2540918

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DOI： 10.1109/TASC.2016.2535863

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DOI： 10.1109/TASC.2016.2535965

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DOI： 10.1109/TASC.2016.2530301

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DOI： 10.1109/TASC.2016.2536736

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DOI： 10.1109/TASC.2016.2535966

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DOI： 10.1016/j.phpro.2016.04.034

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DOI： 10.1088/0953-2048/29/5/055010

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DOI： 10.1109/TASC.2016.2529841

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DOI： 10.1016/j.phpro.2015.06.095

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DOI： 10.1109/TASC.2014.2366552

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DOI： 10.1016/j.phpro.2015.05.122

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DOI： 10.1109/TASC.2014.2371133

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DOI： 10.1109/TASC.2014.2385962

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DOI： 10.1109/TASC.2014.2368713

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DOI： 10.1109/TASC.2014.2380783

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DOI： 10.1109/TASC.2014.2372048

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DOI： 10.1088/1742-6596/568/3/032019

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DOI： 10.1109/TASC.2013.2287059

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DOI： 10.1109/TASC.2013.2284422

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DOI： 10.1109/TASC.2013.2287054

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DOI： 10.1109/TASC.2013.2292367

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DOI： 10.1063/1.4860776

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DOI： 10.1016/j.physc.2013.04.068

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DOI： 10.2221/jcsj.48.239, 10.1016/j.cryogenics.2019.03.009_references_DOI_Ht9nhV4FesInxDHFpnGCh3WAu1F

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DOI： 10.1016/j.physc.2012.02.041

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DOI： 10.1109/TASC.2011.2179405

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DOI： 10.1109/TASC.2010.209012

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DOI： 10.1063/1.2908567

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DOI： 10.1109/TASC.2006.873266

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DOI： 10.1088/1742-6596/43/1/257

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DOI： 10.1109/TASC.2006.873268

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DOI： 10.1016/j.physc.2005.03.074

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DOI： 10.1109/TASC.2005.849226

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DOI： 10.1109/TASC.2004.830106

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DOI： 10.1109/TASC.2003.812938

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DOI： 10.1109/TASC.2002.1018529

Event date： 2023.11

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Event date： 2023.5 - 2023.6

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Venue：東京   Country：Japan  

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Venue：鹿児島   Country：Japan  

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Country：United States  

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Venue：HONOLULU   Country：United States  

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Event date： 2021.11

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Venue：オンライン   Country：Japan  

Event date： 2021.5

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Venue：オンライン   Country：Japan  

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Venue：オンライン   Country：Japan  

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Venue：オンライン   Country：Japan  

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Peer review 

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

Number of peer-reviewed articles in Japanese journals：1

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

【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

【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/

【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】