关键词: 永磁同步电机, 有限元法, 二维模型, 电磁场, 耦合故障分析

Abstract:

There are many types of faults, such as turn-to-turn short-circuit fault, permanent magnet demagnetization fault and eccentric fault, and the research on fault diagnosis has been focused on single fault, and the coupling fault involves less. Taking the inter-turn short circuit - demagnetization coupling fault as an example, the finite element method is used to establish the two-dimensional model of the motor normal condition and the different coupling fault degree respectively. The magnetic-sensing line distribution of the motor in the normal and different fault conditions is obtained by the transient magnetic field solver. The torque curve, the opposite potential curve and the inverse potential harmonic content are analyzed by Fourier transform. The results show that the three harmonic content of the opposite electric potential is obviously higher than the normal condition value in the coupled fault condition, so the increase of the three harmonics of the opposite electric potential is proposed as the basis for judging the coupling fault.

Key words: permanent magnet synchronous motor, finite element method, two dimensional model, electro-magnetic field, coupling failure analysis