摘要：本文在阐述内置式永磁同步电动机弱磁扩速原理的基础上，得出通过增加电动机直轴电感Ld、减小交轴电感Lq,合理的漏磁系数有利于弱磁扩速。接着分析了气隙和永磁体磁化方向长度对定子直轴和交轴电感以及空载系数的影响。

关键词：永磁同步电动机；内置式；弱磁扩速

Abstract: In this paper, increasing the motor direct axis inductance Ld and reducing the cross-axis inductance Lq, a reasonable magnetic flux leakage coefficient  was beneficial to the flux-weakening speed expansion, on the basis of the principle of flux-weakening of permanent magnet synchronous motor.Then, analyzed the the influence of air gap and length of permanent magnet magnetization direction on the stator direct-axis and cross-axis inductance, magnetic flux leakage coefficient.

Key words: permanent magnet synchronous motor；interior；flux-weakening speed expansion