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Permanent-Magnet Shape Optimization Effects on Synchronous Motor Performance

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2 Author(s)
Laskaris, K.I. ; Dept. of Electr. & Comput. Eng., Nat. Tech. Univ. of Athens, Athens, Greece ; Kladas, A.G.

The magnet shape in permanent-magnet (PM) synchronous motors substantially affects the back-electromotive-force (EMF) waveform and the stator iron losses, which are of particular importance in traction applications, where the energy available in the battery box is limited. This paper presents a methodology based on geometry optimization, providing sinusoidal back-EMF waveform. The method has been applied in a surface PM motor case for electric vehicle, and its validity has been checked by measurements on two prototypes, the first one with constant magnet width and the second one with optimized magnet shape.

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Industrial Electronics, IEEE Transactions on  (Volume:58 ,  Issue: 9 )