失磁故障对多极少槽永磁同步电机的影响

Demagnetization fault's influence in permanent magnet synchronous motors with multiple poles and few slots

永磁体在受到高温、振动等情况易发生不可逆退磁,多极少槽永磁同步电动机不仅存在传统意义上的极间漏磁和端部漏磁,还包括齿顶漏磁,因此计算该类电机失磁故障后的漏磁因数非常重要。本文通过有限元法对多极少槽永磁同步电机失磁前后的极间漏磁因数、齿顶漏磁因数、径向漏磁因数及空载漏磁因数进行计算分析,得出了失磁故障与漏磁系数之间的变化规律。失磁故障后电机的主磁通降低,进而影响电机的气隙磁场,通过对气隙磁场进行傅里叶分解,得出了失磁故障对气隙磁场的影响。本文结果为研究失磁故障对多极少槽永磁同步电机的性能影响提供了理论依据。

Permanent magnet under high temperature, vibration, and so on easily occur irreversible demagnetization, permanent magnet synchronous motors with multiple poles and few slots not only exist in the traditional sense of the pole-to-pole leakage and brow leakage, include zigzag leakage, so the calculation of leakage factor of this kind of motor after motor excitation-loss fault is very important. In this paper, analyze the pole-to-pole leakage factor, zigzag leakage factor, radial leakage factor and no- load leakage factor in PMSM with multiple poles and few slots before and after the loss of excitation. The main magnetic flux of the motor with demagnetization fault will reduce, and thus affects the air-gap magnetic field of the motor. Through the study of the Fourier decomposition of air-gap magnetic field, the excitation-loss fault of air-gap magnetic field is obtained. The results of this paper provides theoretical basis for the study of loss of excitation fault＇s influence on leakage factor in permanent magnet synchronous motors with multiple poles and few slots.