中文摘要：

本文通过对永磁体形状进行分析和优化使永磁同步电机产生正弦形反电动势。首先在理想条件下利用拉普拉斯方程对永磁同步电机的永磁体形状进行了推导,并提出了两种近似的永磁体形状来代替理想的正弦形永磁体,然后通过对两种永磁体气隙进行有限元分析,可以得出这两种永磁体产生的气隙磁密与标准的正弦形气隙磁密波形比较接近。最后通过对两种永磁体电机的反电动势进行谐波分析得出弧形永磁体较瓦片型永磁体产生的反电动势谐波成分少,更适合用于永磁同步电机。

英文摘要：

This paper introduces the technique of magnet shaping for permanent magnet synchronousmotor （PMSM） to produce required sinusoidal back electromotive force （EMF） waveforms. Firstlythe ideal magnet shape to produce sinusoidal waveforms is obtained by Laplace＇s equation, and then two modified magnet shapes are proposed to substitute the ideal magnet shape. Finite-element-analysis is then employed to verify the flux distribution of the two magnet shapes. At last, the back EMFs are measured on two PMSMs with different magnet shape, by the method of FFT, we get the conclusion that the arc shape magnet is more suitable for PMSM.