摘  要：用电磁场有限元方法分析不同温度下永磁电机在三相对称短路过程中永磁体局部失磁情况，研究不同程度失磁故障下永磁电机反电势和磁链变化特点，并对电机带故障运行的行为表现和继续失磁的情况进行研究，为相应失磁故障的判定和保护提供一定的依据。
关键词：局部失磁；三相对称短路；永磁电机；故障运行

Abstract: The Finite Element Method was applied to analyze the permanent magnets of PMSM under different temperature partially demagnetized by the process of the three phase symmetrical short circuit. Researched the characterization of Back-emf and Flux-linkage when the PMSM appearsed varying degrees demagnetization. Then investigated the feature of the demagnetized PMSM which operated in rated load and whether led the permanent magnets to be demagnetized again, the result will be an evidence to support judging and preventing related demagnetization fault.
Key words: partial demagnetization; three phase symmetrical short circuit; PMSM; operation in fault