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[文献書誌] Lei Ma, Masayuki Sanada, Shigeo Morimoto, Yoji Takeda: "Extending Operating Range of Permanent Magnet Synchronous Motor Utilizing Flux-Shortenin2 Iron Pieces"Proc. of the Third Chinese International Conference on Electrical Machines. 175-178 (1999)
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[文献書誌] Lei Ma, Masayuki Sanada, Shigeo Morimoto, Yoji Takeda, Nobuyuki Matsui: "High Efficiency Adjustable Speed Control of IPMSM with Variable Permanent Magnet Flux Linkage"Proc. of IEEE Industry Applications Society Annual Meeting. 881-887 (1999)
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[文献書誌] Lei Ma, Masayuki Sanada, Shigeo Morimoto, Yoji Takeda: "An Interior Permanent Magnet Synchrnous Motor with Variable Permanent Magnet Flux Linkage"Proc. of the Third Small Motors International Conference. 173-178 (1999)
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[文献書誌] 馬雷, 真田雅之, 森本茂雄, 武田洋次: "永久磁石の電機子鎖交磁束可変形埋込磁石構造PMモータの広範囲高効率速度制御"電気学会論文誌D. 120-D, No.8/9. 1031-1036 (2000)
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[文献書誌] Lei Ma, Masayuki Sanada, Shigeo Morimoto, Yoji Takeda: "IPMSM with Adjustable PM Armature Flux Linkage for High Efficiency and Wide Range Operation"Trans. lEE of Japan (電気学会論文誌D). 121-D, No.3. 371-376 (2001)
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[文献書誌] Lei Ma, Masayuki Sanada, Shigeo Morimoto, Yoji Takeda, Hiroshi Murakami: "New Method for Efficiency Improvement and Operating Range Extension of IPMSM with Adjustable PM Armature Flux Linkage"Proc. of the European Conference on Power Electronics and Applications. (CD-ROM). (2001)
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[文献書誌] L.Ma, M.Sanada, S.Morimoto, Y.Takeda: "Advantages of IPMSM with Adjustable PM Armature Flux Linkage in Efficiency Improvement and Operating Range extension"Proc. of Power Conversion Conference Osaka 2002. (2002)