論文 - 川越　明史

A. Kawagoe, M. Yoshida, S. Ando, S. Miura, H. Miyazaki, and M. Iwakuma .  Current Sharing in Parallel Conductors Using Bi-2223 Tapes in Perpendicular Magnetic Fields .  IEEE Transactions on Applied Superconductivity35 ( 5 ) 6400205   2025年8月査読

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE Transactions on Applied Superconductivity  

Fully superconducting synchronous motors are very interesting for mobile applications such as aviation, thanks to their high output power density (kW&#x002F;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 REBa₂Cu₃O<italic>_y</italic> parallel tapes with&#x002F;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.2024.3522074

Scopus

Kei Shiohara, M. Sato, Y. Takahashi, K. Adachi, Akifumi Kawagoe, Teruo Izumi, Masataka Iwakuma .  Stacked Superconducting Cables With Coated Conductors Using New Corrugated Tubes for Electric Propulsion Systems for Aircraft .  IEEE Transactions on Applied Superconductivity35 ( 5 ) 3600704   2025年8月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE Transactions on Applied Superconductivity  

Fully superconducting synchronous motors are very interesting for mobile applications such as aviation, thanks to their high output power density (kW&#x002F;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 REBa₂Cu₃O<italic>_y</italic> parallel tapes with&#x002F;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.2025.3538574

Scopus

H. Miyazaki, M. Iwakuma, Y. Emori, R. Konishi, K. Yoshida, S. Sato, H. Sasa, S. Miura, I. Sagara, Y. Suzuki, M. Konno, H. Hirai, A. Kawagoe, T. Izumi .  Performance Testing of 400 kW-Rated REBCO Superconducting Synchronous Machine in Low-Temperature and Low-Pressure Environments .  IEEE Transactions on Applied Superconductivity35 ( 5 ) 5201305   2025年8月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE Transactions on Applied Superconductivity  

Fully superconducting synchronous motors are very interesting for mobile applications such as aviation, thanks to their high output power density (kW&#x002F;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 REBa₂Cu₃O<italic>_y</italic> parallel tapes with&#x002F;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.2025.3538574

Scopus

Goki Kawasaki, Kazuki Nakamura, Yudai Kimura, Tomohiro Inoue, Yohei Masuda, Shun Miura, Akifumi Kawagoe, Masataka Iwakuma .  Experimental Evaluation of Transposed Three-Parallel Conductors to Achieve Uniform Current in Armature Coils of Superconducting Motors .  IEEE Transactions on Applied Superconductivity35 ( 5 ) 5201205   2025年8月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE Transactions on Applied Superconductivity  

Fully superconducting synchronous motors are very interesting for mobile applications such as aviation, thanks to their high output power density (kW&#x002F;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 REBa₂Cu₃O<italic>_y</italic> parallel tapes with&#x002F;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.2024.3520549

Scopus

Miura S., Nakamura K., Masuda Y., Kawasaki G., Miyazaki H., Kawagoe A., Sasa H., Yoshida K., Sato S., Iwakuma M. .  Current Sharing among Three-strand Parallel Conductors Composed of REBCO Tapes in Three-phase Armature Coil Conditions .  IEEE Transactions on Applied Superconductivity34 ( 5 ) 5200905   2024年8月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE Transactions on Applied Superconductivity  

Fully superconducting synchronous motors are very interesting for mobile applications such as aviation, thanks to their high output power density (kW&#x002F;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 REBa₂Cu₃O<italic>_y</italic> parallel tapes with&#x002F;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

Scopus

Akifumi Kawagoe, Ryunosuke Torii, Shinpei Nakagawa, Shun Miura, Hiroshi Miyazaki, Masataka Iwakuma .  Measurement System for Induced Currents in Superconducting Air-Core Rotors for Induction Motors .  IEEE Transactions on Applied Superconductivity34 ( 5 ) 5203205   2024年8月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE Transactions on Applied Superconductivity  

DOI： 10.1109/TASC.2024.3385737

Scopus

Miura S., Kobun A., Masuda Y., Kawasaki G., Miyazaki H., Kawagoe A., Sasa H., Yoshida K., Sato S., Iwakuma M. .  Current Distribution among Transposed Eight- and 16-parallel REBa2Cu3Oy Wires in Single-phase Armature Coils .  IEEE Transactions on Applied Superconductivity34 ( 5 ) 5201906   2024年5月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE Transactions on Applied Superconductivity  

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 REBa₂Cu₃O<italic>_y</italic> 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 &#x00B1; 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

Scopus

KAWAGOE A., YOSHIMO K., MOTOKI Y., OBANA T., TAKAYASU M. .  Investigation of Intertape Coupling Losses in YBCO-Stacked Cables .  Plasma and Fusion Research18 ( 0 ) 2405074 - 2405074   2023年8月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：一般社団法人 プラズマ・核融合学会  

We investigated intertape coupling losses in yttrium barium copper oxide (YBCO)-stacked cables. YBCO stacked cables are being researched and developed as candidates for large 100 kA-class conductors for nuclear fusion. Here, we report intertape coupling losses in a conductor of 50 stacked tapes measured in liquid nitrogen. The measured conductor consists of soldered intertape connections. A copper layer surrounded the YBCO tape in the sample conductor. Fifty YBCO tapes were stacked, and the entire sample was bound with a copper tape and then impregnated with solder. This sample was approximately 100 mm long without twisting. The intertape coupling current flowed over the entire length of the sample conductor due to nontwisting. First, intertape resistance was estimated by comparing the measured and theoretical coupling losses. Subsequently, the coupling current paths in the cross-section of the sample were investigated. We found that intertape resistances were affected by the copper tape used to bind the stacked YBCO tapes.

DOI： 10.1585/pfr.18.2405074

Scopus

Miura S., Kobun A., Masuda Y., Nakamura K., Miyazaki H., Kawagoe A., Sasa H., Yoshida K., Sato S., Iwakuma M. .  Current Sharing among Transposed Three-Parallel REBa2Cu3Oy Tapes in Single-Phase Armature Coils .  IEEE Transactions on Applied Superconductivity33 ( 5 ) 5200306   2023年8月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE Transactions on Applied Superconductivity  

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

Scopus

Hirano N., Onodera Y., Mito T., Motoki Y., Kawagoe A. .  Basic Research on a Magnetic Refrigeration System for Cooling to Liquid Hydrogen Temperature .  IEEE Transactions on Applied Superconductivity33 ( 5 ) 4702605   2023年8月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE Transactions on Applied Superconductivity  

Magnetic refrigeration technology is expected to be a highly efficient process at a temperature of around 20 K, which is the hydrogen liquefaction temperature. In magnetic refrigeration, a magnetic field change is applied to a magnetocaloric material (MCM) to obtain a magnetocaloric effect. In addition, since the greater the magnetic field change, the better the cooling characteristics, the magnetic field strength of permanent magnets is insufficient, and the use of superconducting coils that can generate strong magnetic fields with low power consumption is essential. We are researching and developing a static magnetic refrigeration system (SMRS) that does not have moving parts to obtain magnetic field changes, and generates them by altering the energizing current to the coil. The key to devising this system is an AC loss of the superconducting coil. In this study, we measured the AC loss under energization conditions of multiple palm-sized REBCO coils at liquid nitrogen temperature, and calculated the efficiency of the SMRS by improving the accuracy of the analysis method for evaluating the AC loss, based on the results. We report the results and discuss the technical feasibility of SMRS.

DOI： 10.1109/TASC.2023.3263786

Scopus

Takashima A., Onamyuda Y., Kobun A., Miyazaki H., Kawagoe A., Miura S., YYoshida K., Sato S., Sasa H., Iwakuma M. .  Current Distribution of Armature Coils Combining Two Different Sizes of REBCO Racetrack Double Pancakes .  IEEE Transactions on Applied Superconductivity33 ( 5 ) 4600905   2023年8月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE Transactions on Applied Superconductivity  

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.2023.3241822

Scopus

Miura S., Kobun A., Masuda Y., Miyazaki H., Kawagoe A., Sasa H., Yoshida K., Sato S., Iwakuma M. .  Development and assessment of simplified analytical method for current distribution among REBa2Cu3Oy parallel conductors in armature windings for fully superconducting rotating machines .  Superconductor Science and Technology36   065007   2023年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Superconductor Science and Technology  

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

Scopus

Obana T., Kawagoe A .  Numerical Analysis of Hysteresis Loss in Stacked REBCO Tapes for Large Current-Carrying Conductors .  Plasma and Fusion Research18 ( 0 ) 2405013 - 2405013   2023年2月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：一般社団法人 プラズマ・核融合学会  

We investigated intertape coupling losses in yttrium barium copper oxide (YBCO)-stacked cables. YBCO stacked cables are being researched and developed as candidates for large 100 kA-class conductors for nuclear fusion. Here, we report intertape coupling losses in a conductor of 50 stacked tapes measured in liquid nitrogen. The measured conductor consists of soldered intertape connections. A copper layer surrounded the YBCO tape in the sample conductor. Fifty YBCO tapes were stacked, and the entire sample was bound with a copper tape and then impregnated with solder. This sample was approximately 100 mm long without twisting. The intertape coupling current flowed over the entire length of the sample conductor due to nontwisting. First, intertape resistance was estimated by comparing the measured and theoretical coupling losses. Subsequently, the coupling current paths in the cross-section of the sample were investigated. We found that intertape resistances were affected by the copper tape used to bind the stacked YBCO tapes.

DOI： 10.1585/pfr.18.2405013

Scopus

Yuta Okade, Hiroshi Miyazaki, Hiromasa Sasa, Koichi Yoshida, Shun Miura Teruyoshi Sasayama, Takashi Yoshida, Akifumi Kawagoe, Masataka Iwakuma .  REBCO Trapezoidal Armature Windings for Superconducting Induction Motors .  IEEE Transactions on Applied Superconductivity32 ( 6 )   2022年9月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE Transactions on Applied Superconductivity  

DOI： 10.1109/TASC.2022.3160146

Scopus

Naoki Hirano*, Yuta Onodera*, Toshiyuki Mito*, Yuma Ueno, Akifumi Kawagoe .  Development of Static Magnetic Refrigeration System Using Multiple High-Temperature Superconducting Coils .  IEEE Transactions on Applied Superconductivity32 ( 6 ) 0500105   2022年9月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE Transactions on Applied Superconductivity  

DOI： 10.1109/TASC.2022.3152456

Scopus

Noda K., Sasa H., Miyazaki H., Miura S., Yoshida T., Sasayama T., Iwakuma M., Kawagoe A., Izumi T., Konno M., Sasamori Y., Honda H., Hase Y., Shutoh M. .  Numerical simulation of a high-power density 10 MW REBCO superconducting synchronous generator cooled by sub-cooled LN2 for low AC loss .  Journal of Physics: Conference Series2323 ( 1 )   2022年8月

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記述言語：日本語   出版者・発行元：Journal of Physics: Conference Series  

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

Scopus

Junya Oomura, Go Sato, Akifumi Kawagoe .  The calculation and measurement of electromagnetic energy flows for investigation of critical current estimation for high-temperature superconducting coil by means of pick-up coils .  IOP Conference Series: Materials Science and Engineering1240 ( 1 ) 012026   2022年6月査読

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IOP Publishing  

DOI： 10.1088/1757-899X/1241/1/012026

Scopus

Mito Toshiyuki ; Onodera, Yuta ; Otsuji, Maki ; Hirano, Naoki ; Takahata, Kazuya ; Yanagi, Nagato ; Iwamoto, Akifumi ; Hamaguchi, Shinji ; Takada, Suguru ; Baba, Tomosumi ; Chikumoto, Noriko ; Kawagoe, Akifumi ; Kawanami, Ryozo .  Improvement of Ic degradation of HTS conductor (FAIR conductor) and proposal of FAIR coil configuration for fusion device .  IEEE Transactions on Applied Superconductivity31 ( 5 )   2021年8月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE Transactions on Applied Superconductivity  

DOI： 10.1109/TASC.2021.3069923

Scopus

Experimental Evaluation of 1 kW-class Prototype REBCO Fully Superconducting Synchronous Motor Cooled by Subcooled Liquid Nitrogen for E-Aircraft .  IEEE Transactions on Applied Superconductivity31 ( 5 )   2021年8月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE Transactions on Applied Superconductivity  

DOI： 10.1109/TASC.2021.3055452

Scopus

Yuma UENO, Naohiro NAGAMOTO, Akifumi KAWAGOE, Tetsuhiro OBANA, Makoto TAKAYASU .  Evaluation AC Losses in Large-Scale Conductors Consisting of Stacked REBCO Tapes .  Plasma and Fusion Research16   2405071   2021年6月査読 国際共著

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1585/pfr.16.2405071

Naohiro Nagamoto, Akifumi Kawagoe, Toshiyuki Mito*, Yuta Onodera*, Kazuya Takahata*, Nagato Yanagi*, Shinji Hamaguchi*, and Naoki Hirano* .  Thermal Transport Properties of Multiple Oscillating Heat Pipes under Simultaneous Operation .  Journal of Physics: Conference Series1559 ( 1 ) 012144   2020年6月招待 査読

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：IOP Publishing  

DOI： 10.1088/1742-6596/1559/1/012091

Scopus

Akifumi Kawagoe, Kazuma Kudou, Ryota Kanemaru, Masataka Iwakuma Masayuki Konno, Akira Tomioka, Teruo Izumi .  Winding Configurations and AC Loss of Superconducting Synchronous REBCO Motors .  Journal of Physics: Conference Series1559 ( 1 ) 012144   2020年6月査読 国際誌

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IOP Publishing  

DOI： 10.1088/1742-6596/1559/1/012144

Scopus

Koichiro Ozaki, Yuma Doi, Koichi Yoshida, Shun Miura, Teruyoshi Sasayama, Takashi Yoshida, Kaoru Yamamoto, Masataka Iwakuma, Akifumi Kawagoe, Masayuki Konno, Teruo Izumi .  Conceptual Design of Superconducting Induction Motors Using REBa2Cu3Oy Superconducting Tapes for Electric Aircraft .  IEEE Transactions on Applied Superconductivity30 ( 4 ) 8984315   2020年6月査読 国際誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元： IEEE  

DOI： 10.1109/TASC.2020.2971671

Scopus

Toshiyuki Mito*, Yuta Onodera* , Naoki Hirano*, Kazuya Takahata*, Nagato Yanagi* Akifumi Iwamoto*, Tomosumi Baba*, Noriko Chikumoto*, Shinji Hamaguchi*, Suguru Takada* Akifumi Kawagoe* and Ryozo Kawanami* .  Development of FAIR conductor and HTS coil for fusion experimental device .  Journal of Physics Communications4 ( 3 ) 035009 - 035009   2020年3月査読 国際誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IOP Publishing  

DOI： 10.1088/2399-6528/ab7954

Scopus

Akifumi Kawagoe, Keita Hosoda, Junya Tsuruda .  The Method to Diagnose Soundness of the High Temperature Superconducting Coil by Pick-Up Coil Pairs .  IEEE Transactions on Applied Superconductivity29 ( 5 ) 5501504   2019年8月査読 国際誌

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE  

DOI： 10.1109/TASC.2019.2905982

Scopus

Akifumi Kawagoe, Kyosuke Inoue, Yuki Higashi, Masataka Iwakuma, Msayuki Konno, Akira Tomioka, Yoshi Ji Hase, and Teruo Izumi .  Numerical Analyses on the Influences of Armature Winding Shape and Yoke Arrangements on Total Losses in Fully Superconducting Synchronous Motors Using REBCO Tapes .  IEEE Transactions on Applied Superconductivity28 ( 4 ) 5208104   2018年6月査読 国際誌

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE  

DOI： 10.1109/TASC.2018.2818750

Scopus

Toshiyuki Mito, Akifumi Kawagoe, Nagato Yanagi, Shinji Hamaguchi, Suguru Takada, Naoki Hirano, Yoshiro Terazaki .  Highly Efficient Liquid Hydrogen Storage System by Magnetic Levitation Using HTS Coils .  IEEE Transactions on Applied Superconductivity27 ( 4 ) 3600705   2017年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元： IEEE  

Highly efficient liquid hydrogen storage system is studied with magnetic levitation using high-temperature superconducting (HTS) coils. The system also has high safety in case of emergency, such as an earthquake, with a seismic isolation to absorb vibrations provided by HTS levitation coils setup on the ground side. In such an emergency case, it is considered that a large amount of ac losses are generated in HTS coils, and the winding temperature may rise to lead to a coil quench. In this study, the self-oscillation-type heat pipe (OHP), whose thermal transport property is much greater than that of solid thermal conduction, is used to cool the coil windings. As a result, an HTS coil equipped with an OHP cooling system can be realized, supporting both low heat loads in the usual operation and high heat loads in an emergency.

DOI： 10.1109/TASC.2017.2653228

Scopus

Keisuke Sakemoto, Toshiki Kubo, Akifumi Kawagoe .  The Method to Diagnose Local Abnormalities in Windings of High Temperature Superconducting Transformer During Load Changing .  Physics Procedia81   199 - 202   2016年6月査読

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：Elsevier  

DOI： 10.1016/j.phpro.2016.04.050

Akifumi Kawagoe, Hideki Higuchi, Naoki Matsufuji .  A Measurement Method of AC Losses in Superconducting Coils Using Poynting's Vector Method .  IEEE Transactions on Applied Superconductivity24 ( 3 ) 9000604   2014年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Hiroki Hiwatashi, Ryoma Mizoue, Akifumi Kawagoe, Tohru Eguchi .  Detection of Local Abnormalities in Windings of High-Temperature Superconducting Transformers by Using Pick-Up Coils .  IEEE Transactions on Applied Superconductivity24 ( 3 ) 9001104   2014年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Akifumi Kawagoe, Hiroaki Moribe, Kosuke Kakiyama, Fumio Sumiyoshi .  Diagnosis of Winding Conditions in High Temperature Superconducting Coils by Applying Poynting’s Vector Method .  IEEE Transactions on Applied Superconductivity23 ( 3, Art. Num. 9000804 )   2013年6月査読

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

機関リポジトリURL

Hiromu Sakuda,Tetsuya Tokuda, Mikinari Mukai, Akifumi Kawagoe, Fumio Sumiyoshi, Masataka Iwakuma, Teruo Izumi and Yuh Shiohara .  Improved poynting’s Vector Method: Estimations of Electromagnetic Properties of HTS Tapes Simultaneously Exposed to AC Transport Currents and External Magnetic Fields .  Proceedings of the Twenty-Fourth International Cryogenic Engineering Conference-International Cryogenic Materials Conference 2012   849 - 852   2013年2月査読

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記述言語：日本語   掲載種別：研究論文（国際会議プロシーディングス）  

Mikinari Mukai, Masaharu Furukawa, Hiromu Sakuda, Akifumi Kawagoe, Fumio Sumiyoshi .  AC Loss Measurements of HTS Long Tapas Formed into a Solenoidal Coil Shape Simultaneously Exposed to AC transport Currents and AC External Magnetic Fields by Improved Poynting's Vector Method .  Proceedings of the Twenty-Fourth International Cryogenic Engineering Conference-International Cryogenic Materials Conference 2012   853 - 856   2013年2月査読

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Fumio Sumiyoshi, Akifumi Kawagoe, Yohei Haeyama, Hiromu Sakuda, Mikinari Mukai, Masataka Iwakuma, Teruo Izumi, Yuh Shiohara .  Improved Poynting's Vector Method: AC Loss Measurement of HTS Tapes Formed into a Short Straight or a Solenoidal Coil .  Physics Procedia36   1534 - 1539   2012年9月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

川越明史、小坂亮大、濱田佳志、岡元洋 .  高温超伝導コイルで発生する常伝導領域の非接触型検出法-超伝導変圧器運転時に巻線異常を監視するシステムへの適用- .  低温工学47 ( 5 ) 268 - 275   2012年6月査読

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

川越明史、藤岡直人、木元武尊、住吉文夫 .  高温超伝導コイルで発生する常伝導領域の非接触型検出法-低温容器外周のピックアップコイル群を使う新しい測定法の提案- .  低温工学46 ( 8 ) 481 - 488   2011年8月査読

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

A. Kawagoe, K. Matsushima, Y. Yoshidome, S. Kawabata, F. Sumiyoshi, N. Yanagi, T. Mito,M. Kiuchi, E S. Otabe, T. Matsushita, K. Tanaka,T. Wakuda .  Development of an MgB₂ Coil Wound with a Parallel Conductor Composed of Two Tapes with Insulation .  IEEE Transactions on Applied Superconductivity21 ( 3 ) 1612 - 1615   2011年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

K. Habu, S. Kaminohara,A. Kawagoe, F. Sumiyoshi .  The contactless detection of local normal transitions in superconducting coils by using Poynting vector method .  Physica C470   1860 - 1864   2010年9月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

F. Sumiyoshi, A. Kawagoe, T. Furubeppu, Y. Hoshihira .  Improvement of coil performance by optimal use of multifilamentary superconducting tapes .  Journal of Physics, Conference Series234 ( 22038 ) 1 - 13   2010年7月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

A. Kawagoe, Y. Wakabayashi,K. Matsushima, Y. Yoshidome,S. Kawabata, F. Sumiyoshi,N. Yanagi, T. Mito, M. Kiuchi,E. S. Otabe, T. Matsushita,M. Takahashi, T. Wakuda .  Improvement of Electromagnetic Properties of MgB₂ Filaments Due to Deformation to Tape Shape .  IEEE Transactions on Applied Superconductivity20 ( 3 ) 1601 - 1604   2010年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

S. Kawabata, K. Katoh, A. Kawagoe .  Measurement of Transport Current Losses in HTS Conductors with Large Current Capacity by Using HTS Current Transformer .  IEEE Transactions on Applied Superconductivity19 ( 3 ) 3323 - 3326   2009年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

A. Kawagoe, F. Sumiyoshi, Y. Fukushima, Y. Wakabayashi,T. Mito, N. Yanagi, M. Takahashi,M. Okada .  Critical Currents and AC Losses in MgB₂ Multifilamentary Tapes with 6 Twisted Filaments .  IEEE Transactions on Applied Superconductivity19 ( 3 ) 2686 - 2689   2009年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

F. Sumiyoshi, A. Kawagoe, M. Tokuda, S. Kaminohara .  A Quench Monitoring System of Superconducting Coils by Using the Poynting Vector Method .  IEEE Transactions on Applied Superconductivity19 ( 3 ) 2341 - 2344   2009年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

T. Mito, H. Chikaraishi, A. Kawagoe, R. Maekawa, R. Abe, T. Baba, K.Okumura, A. Kuge, M. Iwakuma, F. Sumiyoshi .  Summary of a 1MJ Conduction-Cooled LTS Pulse Coil Developed for 1MW, 1s UPS-SMES .  IEEE Transactions on Applied Superconductivity19 ( 3 ) 1999 - 2003   2009年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

H. Okamoto, H. Hayashi, A. Tomioka, M. Konno, M. Owa, A. Kawagoe, F. Sumiyoshi, M. Iwakuma, K. Suzuki, T. Izumi, Y. Yamada, Y. Shiohara .  AC loss properties in YBCO model coils for loss reduction .  Physica C468 ( 15-20 ) 1731 - 1733   2008年9月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Shuma Kawabata, Yusuke Nakahama, Akifumi Kawagoe, Fumio Sumiyoshi .  Development of a Compact HTS Current Transformer for Evaluating the Characteristics of HTS Conductors .  IEEE Transactions on Applied Superconductivity18 ( 2 ) 1147 - 1150   2008年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Akifumi Kawagoe, Shinji Tsukuda, Fumio Sumiyoshi, Toshiyuki Mito, Hirotaka Chikaraishi, Tomosumi Baba, Mitsuhiro Yokota, Hideki Ogawa, Tsutomu Hemmi, Ryo Abe, Akira Nakamura, Kagao Okumura, Atsuko Kuge, Masataka Iwakuma .  AC Losses in A Conduction-Cooled LTS Pulse Coil with Stored Energy of 1 MJ for UPS-SMES as Protection from Momentary Voltage Drops .  IEEE Transactions on Applied Superconductivity18 ( 2 ) 783 - 786   2008年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Hirotaka C. .  Study of SMES system using dry type superconducting coil designed to protect from momentary voltage drop .  2007 European Conference on Power Electronics and Applications, EPE   2007年12月

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記述言語：英語   出版者・発行元：2007 European Conference on Power Electronics and Applications, EPE  

DOI： 10.1109/EPE.2007.4417252

Scopus

Akifumi Kawagoe, Shinji Tsukuda, Fumio Sumiyoshi, Toshiyuki Mito, Hirotaka Chikaraishi, Tsutomu Hemmi, Tomosumi Baba, Mitsuhiro Yokota, Yoshitaka Morita, Hideki Ogawa, Ryo Abe, Akira Nakamura, Kagao Okumura, Atsuko Kuge, Masataka Iwakuma .  The Design to Downsize a Conduction-Cooled LTS Pulse Coil for UPS-SMES as Protection from Momentary Voltage Drops .  IEEE Transactions on Applied Superconductivity 17 ( 2 ) 1963 - 1966   2007年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Fumio Sumiyoshi, Akifumi Kawagoe, Akihiro Jikuzono, Toshiyuki Mito, Nagato Yanagi, Tsutomu Hemmi .  AC Losses and Critical Current Densities of NbTi/Cu Multifilamentary Tapes .  IEEE Transactions on Applied Superconductivity17 ( 2 ) 2546 - 2549   2007年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Toshiyuki Mito, Akifumi Kawagoe, Hirotaka Chikaraishi, Ryuji Maekawa, Tsutomu Hemmi, Kagao Okumura, Ryo Abe, Tomosumi Baba, Hideki Ogawa, Mitsuhiro Yokota, Yoshitaka Morita, Kenji Yamauchi, Masataka Iwakuma, Atsuko Kuge, Akira Nakamura, Fumio Sumiyoshi .  Development of 1 MJ Conduction-Cooled LTS Pulse Coil for UPS-SMES .  IEEE Transactions on Applied Superconductivity17 ( 2 ) 1973 - 1976   2007年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Akifumi Kawagoe, Yohichi Kawabata, Fumio Sumiyoshi, Shigeo Nagaya, Naoki Hirano .  Interstand contact resisitances of Bi-2212 Rutherford cables for SMES .  Physica C445   1078 - 1082   2006年10月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Akifumi Kawagoe, Hideyuki Yamamuro, Fumio Sumiyoshi, Toshiyuki Mito, Hirotaka Chikaraishi, Tsutomu Hemmi, Tomosumi Baba, Mitsuhiro Yokota, Yoshitaka Morita, Hideki Ogawa, Ryo Abe, Kagao Okumura, Masataka Iwakuma .  Optimization of a conduction-cooled LTS pulse coil .  Fusion Engineering and Design81 ( 20-22 ) 2457 - 2462   2006年8月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Fumio Sumiyoshi, Shuma Kawabata, Akifumi Kawagoe, Naoki Hirano, Shigeo Nagaya .  Inter-Strand Coupling Losses in Bi-2212 Rutherford Cables .  IEEE Transactions on Applied Superconductivity 16 ( 2 ) 1055 - 1058   2006年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Toshiyuki Mito, Akifumi Kawagoe, Hirotaka Chikaraishi, Ryuji Maekawa, Kagao Okumura, Ryo Abe, Tomosumi Baba, Tsutomu Hemmi, Masataka Iwakuma, Mitsuhiro Yokota, Hideki Ogawa, Yoshitaka Morita, Kenji Yamauchi, Atsuko Kuge, Fumio Sumiyoshi .  Validation of the High Performance Conduction-Cooled Prototype LTS Pulse Coil for UPS-SMES .  IEEE Transactions on Applied Superconductivity 16 ( 2 ) 608 - 611   2006年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Akifumi Kawagoe, Hideyuki Yamamuro, Fumio Sumiyoshi, Toshiyuki Mito, Hirotaka Chikaraishi, Tomosumi Baba, Mitsuhiro Yokota, Yoshitaka Morita, Hideki Ogawa, Tsutomu Hemmi, Kagao Okumura, Ryo Abe, Masataka Iwakuma .  Heat Transfer Properties of a Conduction Cooled Prototype LTS Pulse Coil for UPS-SMES .  IEEE Transactions on Applied Superconductivity 16 ( 2 ) 624 - 627   2006年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Toshiyuki Mito, Akifumi Kawagoe, Hirotaka Chikaraishi, Kagao Okumura, Ryo Abe, Tsutomu Hemmi, Ryuji Maekawa, Kazutaka Seo, Tomosumi Baba, Mitsuhiro Yokota, Yoshitaka Morita, Hideki Ogawa, Kenji Yamauchi, Masataka Iwakuma, Fumio Sumiyoshi .  Prototype Development of a Conduction-Cooled LTSPulse Coil for UPS-SMES .  IEEE Transactions on Applied Superconductivity 15 ( 2 ) 1935 - 1938   2005年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Akifumi Kawagoe, Fumio Sumiyoshi, Toshiyuki Mito, Hirotaka Chikaraishi, Ryuji Maekawa, Kazutaka Seo, Tomosumi Baba, Tsutomu Hemmi, Kagao Okumura, Masataka Iwakuma, Kazuo Hayashi, Ryo Abe .  Stability Evaluation of a Conduction-Cooled Prototype LTS Pulse Coil for UPS-SMES .  IEEE Transactions on Applied Superconductivity 15 ( 2 ) 1891 - 1894   2005年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Hirotaka C. .  UPS SMES using dry type superconducting coil designed to protect from momentary voltage drop .  2005 European Conference on Power Electronics and Applications2005   2005年

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出版者・発行元：2005 European Conference on Power Electronics and Applications  

DOI： 10.1109/epe.2005.219389

Scopus

Ogawa H. .  Control system for SMES coil winding machine .  PCaPAC 2005 - 5th International Workshop on Personal Computers and Particle Accelerator Controls, Proceedings   2005年

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出版者・発行元：PCaPAC 2005 - 5th International Workshop on Personal Computers and Particle Accelerator Controls, Proceedings  

Scopus

川越明史、住吉文夫、林秀美、花井哲、濱島高太郎 .  高温超伝導コイルの高性能化を目指す新しいケーブル・イン・コンジット型導体の開発 .  電気学会論文誌B124 ( 10 ) 1186 - 1192   2004年10月査読

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

Akifumi Kawagoe, Fumio Sumiyoshi, Toshiyuki Mito, Teruko Kawashima .  Compact stranded superconducting conductors with both low ac loss and high stability. II. Experiments to confirm fundamental performance .  Cryogenics44 ( 9 ) 623 - 630   2004年9月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Akifumi Kawagoe, Fumio Sumiyoshi, Toshiyuki Mito, Teruko Kawashima, Naoki Hirano .  Compact stranded superconducting conductors with both low ac loss and high stability. I. Proposal of a new design .  Cryogenics44 ( 9 ) 617 - 622   2004年9月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Akifumi Kawagoe, Fumio Sumiyoshi, Toshiyuki Mito, Hirotaka Chikaraishi, Tomosumi Baba, Kagao Okumura, Masataka Iwakuma, Tsutomu Hemmi, Kazuo Hayashi, Ryo Abe, Toshio Ushiku, Kazutomi Miyoshi .  Winding Techniques for Conduction Cooled LTS Pulse Coils for 100kJ Class UPS-SMES as a Protection from Momentary Voltage Drop .  IEEE Transactions on Applied Superconductivity 14 ( 2 ) 727 - 730   2004年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Hirofumi Kasahara, Fumio Sumiyoshi, Akifumi Kawagoe, Kazuto Kubota, Shirabe Akita .  AC losses in long Bi-2223 tapes wound into a solenoidal-coil .  IEEE Transactions on Applied Superconductivity 14 ( 2 ) 1078 - 1081   2004年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Toshiyuki Mito, Akifumi Kawagoe, Hirotaka Chikaraishi, Kagao Okumura, Ryo Abe, Tomosumi Baba, Kenji Yamauchi, Mitsuhiro Yokota, Tsutomu Hemmi, Kazutaka Seo, Kazuo Hayashi, Masataka Iwakuma, Fumio Sumiyoshi .  Development UPS-SMES as a protection from momentary voltage drop .  IEEE Transactions on Applied Superconductivity 14 ( 2 ) 721 - 726   2004年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

F. Sumiyoshi, H. Kasahara, A. Kawagoe, K. Kubota, S. Akita .  Poynting vector method: AC loss measurement of long HTS tapes or wires wound into a solenoidal-coil .  IEEE Transactions on Applied Superconductivity13 ( 2 ) 3663 - 3666   2003年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

A. Kawagoe, F. Sumiyoshi, M. Nakanishi, T. Mito, T. Kawashima .  A new winding method to reduce AC losses in stable LTS pulse coils .  IEEE Transactions on Applied Superconductivity13 ( 2 ) 2404 - 2407   2003年6月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

川越明史、住吉文夫、三戸利行、川島照子 .  低損失性と高安定性を両立した超伝導成形より線型導体 Ⅱ.基本性能確認のための実験 .  低温工学38 ( 6 ) 291 - 298   2003年6月査読

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

川越明史、住吉文夫、三戸利行、川島照子、平野直樹 .  低損失性と高安定性を両立した超伝導成形より線型導体 Ⅰ.新設計法の提案 .  低温工学38 ( 6 ) 285 - 290   2003年6月査読

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

A. Kawagoe, K. Yoshikawa, F. Sumiyoshi, T. Kawashima, T. Mito .  Minimum quench energy of new type Rutherford cable with both high stability and low losses .  Physica C378-381   1154 - 1157   2002年10月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

F. Sumiyoshi, A. Kawagoe, K. Yamashita, H. Hayashi, H. Okamoto .  Development of Bi-2223 coils without degradation due to face-on oriented magnetic fields applied to wound tapes .  Physica C372-376   1402 - 1405   2002年8月査読

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Sumiyoshi F. .  Reduction of transport current losses in Bi-Sr-Ca-Cu-O wires with transposed filaments .  IEEE Transactions on Applied Superconductivity11 ( 1 III ) 2792 - 2795   2001年3月査読 国際誌

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE Transactions on Applied Superconductivity  

DOI： 10.1109/77.919643

Scopus