摘  要：利用有限元法分析不同温度下发生相间和单相短路故障对永磁电机的暂态失磁影响，研究不同类型失磁电机的空载反电势和磁链波形及其各次谐波的变化规律，并对两类失磁电机带故障运行的行为表现和继续失磁的情况进行对比研究，为判断短路故障类型、失磁严重程度进而完善电机在线监测理论提供依据。
关键词：暂态失磁；不对称短路；永磁电机；故障运行

Abstract: The finite element method is applied to analyze the permanent magnets of PMSM under different temperature demagnetized by the transient process of Inter-phase and single-phase short circuit. Research the characterization of back-EMF and flux-linkage waves and the regular of harmonic when the PMSM appears different kinds of demagnetization. Then investigate the feature of two kinds of the demagnetized PMSM which operated in fault and whether it will lead the permanent magnets to be demagnetized again, the result provide the basis for judging different short circuit fault and the demagnetizing level and go on improving the thesis of on-line monitoring.
Key words: transient demagnetization；asymmetric short circuit；PMSM；operated in fault