永磁同步电机失磁故障分析

Permanent magnet synchronous machine (PMSM) is used widely in different industrial sectors for variety applications due to their high efficiency, high energy density, and simple structure. Demagnetization fault of PMSM is prone to occur by influence of temperature, armature reaction, vibration and other factors when the machine is on operation .Since demagnetization of permanent magnet results in degradation of motor performance and even stall, it's important to analyze and monitor the permanent magnet condition . In this paper, a adjust-speed PMSM is modelled and simulated Based on electromagnetic field analysis software ansoft 13 of two dimensional Finite Element Analysis, and simulate the demagnetization fault to occur. The FFT transformation is used to analyze the spectrum of the back-EMF in fault condition, then the spectrum is compared with the normal state to identify characteristics of the motor demagnetization fault. The analysis of PMSM demagnetization fault provide a theoretical basis for the further to develop online monitoring system .