关键词: 永磁同步电机, 匝间短路, 故障诊断, 线性扩张状态观测器

Abstract: In recent years,permanent magnet synchronous motor ( PMSM) has been widely used in rail transit because of its high power density and high efficiency,as a common fault,stator winding turn-to-turn short circuit has a serious impact on the normal operation of the motor. Therefore,it is a great significance to diagnose the turn-to-turn short circuit fault of PMSM. In this paper, the characteristic parameters of stator turn-to-turn short circuit fault are extracted by modeling the stator turn-to-turn short circuit fault, and the fault voltage disturbances are observed by using the linear extended state observer ( LESO) ,and its characteristic quantities are selected and observed. The fault feature index is extracted by positive
and negative sequence Park transformation,so as to realize the fault diagnosis of stator turn-to-turn short circuit. The method has good adaptability and expansibility, it can diagnose faults accurately, and improves the stability of motor operation effectively. It has good application prospect and practical value.

Key words: permanent magnet synchronous motor, turn-to-turn short circuit, fault diagnosis, linear extended state observer