Examination of Magnetic Form for Interior Permanent Magnetic Type Synchronous Motor for Electric Vehicles

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  • 電気自動車用埋込磁石型同期電動機の磁石形状の検討
  • デンキ ジドウシャヨウ ウメコミ ジシャクガタ ドウキ デンドウキ ノ ジシャク ケイジョウ ノ ケントウ

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Abstract

Greater efficiency for electric vehicle motors is demanded nowadays. Significantly, higher efficiency of permanent magnetic type synchronous motor is possible, particulary for the IPM(interior permanent magnetic type) synchronous motor which has great mechanical strength and high efficiency because it uses the reluctance torque efficiently. However, the IPM motor's are influenced by not only induced voltage harmonic but also cogging torque. This paper describes the examinations of magnetic form for the IPM motor. The IPM moter's of trapezoid magnet form with gap have proved characteristics of the induced voltage sinewave form and high efficiency and low cogging torque.

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