| 1. |
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, High efficiency and high power electric propulsion system for airplane by superconductivity
Development of a REBCO fully superconducting motor and cooling system, Applied Superconductivity Conference 2022, 2022.10, s a measure against global warming, aircraft are also required to have zero emissions. Simply changing the fuel of the current aircraft to liquid hydrogen will increase the volume of the fuel tank and reduce the payload due to the small energy density per unit volume of liquid hydrogen. In order to achieve zero emissions for aircraft, it is necessary to develop a compact, lightweight, and highly efficient electric propulsion system to actually realize distributed ducted fans as well as a blended wing body. The application of superconducting technology is indispensable for reducing the weight of electric propulsion systems. We are developing an electric propulsion system with a total output of 20 MW for 100-200 passenger aircraft such as B737 and A320 using REBCO high temperature superconducting wires. As proposed by NASA, it is a method in which a superconducting generator is rotated by a gas turbine, and the generated power is supplied to a superconducting motor via a superconducting cable and a low-temperature operation inverter. The fuel will be liquid hydrogen in the future. The refrigerant for superconducting systems is subcooled liquid nitrogen at 65 to 70K. Liquid nitrogen is cooled by heat exchange with liquid hydrogen. Three years ago, we successfully manufactured a 1kW fully superconducting synchronous motor by way of trial. The armature was cooled with subcooled liquid nitrogen, and the rotating field was cooled with helium gas which was maintained at a temperature around 70 K with subcooled liquid nitrogen. This time, we have completed the design of a 400kW fully superconducting synchronous motor that follows this structure and are currently manufacturing it. The casing is made of CFRP. Liquid nitrogen is cooled by heat exchange with liquid helium instead of liquid hydrogen. In this paper, the outline of the entire project is introduced and the progress of the current situation is reported.. |
| 2. |
H. Miyazaki, M. Iwakuma, S. Sasa, S. Miura, K. Yoshida, S. Sato, I. Sagara, Y. Suzuki, M. Konno, H. Hirai, T. Izumi, Fabrication and test of a 400 kW-class fully superconducting synchronous motor using REBCO tape for an electric propulsion system, International Conference on Magnet Technology 28, 2023.09, Advanced electric propulsion systems have been developed by utilizing superconducting technologies to reduce carbon dioxide emissions from aircraft. This study examines the progress in the development of a 400 kW-class fully superconducting synchronous motor using REBa2Cu3O7- (REBCO) tape. REBCO tapes have high critical current densities; thus, they can generate a strong magnetic field with no iron core, permitting the fabrication of small-sized motors compared with conventional motors with copper wires and iron cores. The 400 kW-class fully superconducting synchronous motor comprised the field and armature coils. The field coil was wound with cons-theta-like racetrack distribution to generate a dipole field with no iron core. The maximum magnetic field was 1.45 T when the operating current was 110 A DC. The armature coil comprised six racetracks double 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.. |
| 3. |
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, 1D-CAEを用いた冷凍機冷却超電導磁石の熱設計, 2021年度春季低温工学・超電導学会, 2021.05. |
| 4. |
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, 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-, 2021年度春季低温工学・超電導学会, 2021.05. |
| 5. |
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, 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-, 2021年度春季低温工学・超電導学会, 2021.05. |
| 6. |
宮﨑 寛史, 伝導冷却 REBCO コイルの磁化緩和特性, 第3回材料研究会／九州・西日本支部合同研究会, 2021.11. |
| 7. |
尾形桐弥,岩熊成卓,宮崎寛史, 三浦峻, 佐々滉太, 中野基貴, 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, 第75回電気・情報関係学会九州支部連合大会, 2022.09. |
| 8. |
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, 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, 第75回電気・情報関係学会九州支部連合大会, 2022.09. |
| 9. |
淺田基寛, 宮崎寛史,岩熊成卓,佐々滉太, 三浦峻, 國安天斗, 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, 第75回電気・情報関係学会九州支部連合大会, 2022.09. |
| 10. |
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
, Electromagnetic Design of a 400 kW REBCO Fully Superconducting Synchronous Motor for Airplane by Finite Element Method Analysis, Applied Superconductivity Conference 2022, 2022.10. |
| 11. |
A. Takashima, Y. Omanyuda, A. Kobun, H. Miyazaki, A. Kawagoe, S. Miura, K. Yoshida, S. Sato, H. Sasa, and M. Iwakuma, Current Distribution of Armature Coils Combining Two Different Sizes of REBCO Racetrack Double Pancakes, Applied Superconductivity Conference 2022, 2022.10. |
| 12. |
A. Kobun, Y. Masuda, S. Miura, H. Miyazaki, K. Yoshida, S. Sato, H. Sasa, M. Iwakuma, 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, Applied Superconductivity Conference 2022, 2022.10. |
| 13. |
K. Jingami, H. Miyazaki, M. Iwakuma, S. Miura, H. Sasa, W. Akaike, R. Oishi, K. Yoshida, AC loss characteristics of stacked REBCO double pancake coils cooled by liquid nitrogen, Applied Superconductivity Conference 2022, 2022.10. |
| 14. |
S. Miura, A. Kobun, A. Takashima, H. Sasa, H. Miyazaki, A. Kawagoe, M. Iwakuma, Current Distributions of Multi-strand Parallel Conductors Composed of REBa2Cu3Oy Superconducting Tapes, Applied Superconductivity Conference 2022, 2022.10. |
| 15. |
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, 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, 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. |
| 16. |
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, 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, 2022年度秋季第104回 低温工学・超電導学会研究発表会, 2022.12. |
| 17. |
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, 台形コイルを用いた超伝導誘導機の電磁解析, 2022年度秋季第104回 低温工学・超電導学会研究発表会, 2022.12. |
| 18. |
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 , 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, 第105回 低温工学・超電導学会研究発表会, 2023.05. |
| 19. |
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, 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, 第105回 低温工学・超電導学会研究発表会, 2023.05. |
| 20. |
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 , 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, 第105回 低温工学・超電導学会研究発表会, 2023.05. |
| 21. |
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, 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, 第105回 低温工学・超電導学会研究発表会, 2023.05. |
| 22. |
Shun Miura, Asato Kobun, Yohei Masuda, Kazuki Nakamura, Hiroshi Miyazaki, Akifumi Kawagoe, Hiromasa Sasa, Koichi Yoshida, Seiki Sato, Masataka Iwakuma, Current Distribution among Transposed Eight-bundle REBCO Wires in Armature Coils, 16th European Conference on Applied Superconductivity, 2023.09. |
| 23. |
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, Progress in the development of high-efficiency electric propulsion systems, 16th European Conference on Applied Superconductivity, 2023.09. |
| 24. |
Shun Miura, Asato Kobun, Yohei Masuda, Kazuki Nakamura, Hiroshi Miyazaki, Akifumi Kawagoe, Hiromasa Sasa, Koichi Yoshida, Seiki Sato, Masataka Iwakuma, Current Distribution among Three-Parallel REBa2Cu3Oy wires in Three-phase Armature Coils, International Conference on Magnet Technology 28, 2023.09. |
| 25. |
A. Takashima, H. Miyazaki, S. Miura, K. Yoshida, S. Sato, H. Sasa, M. Iwakuma, Current Distribution in Armature Coils Comprising Two Sizes of Racetrack Double-Pancakes with REBCO Striated Tapes, International Conference on Magnet Technology 28, 2023.09. |
| 26. |
R. Oishi, K. Jingami, H. Miyazaki, M. Iwakuma, K. Yoshida, S. Miura, H. Sasa, M. Daibo, S. Fujita, Evaluation of the AC loss characteristics of multifilamentary REBCO tapes by the mechanical scratching of MgO2 areas, International Conference on Magnet Technology 28, 2023.09. |
| 27. |
Y. Emori, H. Miyazaki, S. Miura, H. Sasa, M. Iwakuma, Electromagnetic design of a REBCO four-pole full-pitched armature coil composed of trapezoidal windings for fully superconducting synchronous motors, International Conference on Magnet Technology 28, 2023.09. |
| 28. |
M. Tsumori, R. Yamasaki, Y. Okade, H. Miyazaki, S. Miura, H. Sasa, K. Yoshida, M. Iwakuma, Effectiveness of REBCO Trapezoidal Armature Coils Used in Superconducting Induction Motors, International Conference on Magnet Technology 28, 2023.09. |
| 29. |
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, Development of Fully Superconducting Propulsion System for Aircraft with REBCO Tapes, International Symposium on Superconductivity 2023, 2023.11. |
| 30. |
Hiromasa Sasa, Koudai Jingami, Ryoma Oishi, Shun Miura, Hiroshi Miyazaki, Masataka Iwakuma, 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 Symposium on Superconductivity 2023, 2023.11. |
| 31. |
Shun Miura, Yohei Masuda, Kazuki Nakamura, Goki Kawasaki, Hiroshi Miyazaki, Akifumi Kawagoe, Hiromasa Sasa, Koichi Yoshida, Seiki Sato, Masataka Iwakuma, Influence of magnetic shields on current distributions among REBCO parallel conductors in single-phase armature windings, International Symposium on Superconductivity 2023, 2023.11. |
| 32. |
Kaiji Uriu, Masataka Iwakuma, Hiroshi Miyazaki, Shun Miura, Hiromasa Sasa, Electromagnetic design for high power density of fully superconducting synchronous motor with through-shaft type field coil for electric aircraft, International Symposium on Superconductivity 2023, 2023.11. |
| 33. |
佐々 滉太, 三浦 峻, 宮﨑 寛史, 岩熊 成卓, 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, 第106回 低温工学・超電導学会研究発表会, 2023.12. |
