基于小波分析的PMSM匝间短路故障诊断方法OA

To achieve early and accurate detection of inter-turn short circuit faults in permanent mag-net synchronous motor(PMSM),a voltage second harmonic component detection method based on dis-crete wavelet transform was proposed.In order to simplify the fault model of the PMSM in the three-phase coordinate system,the short-circuit current and voltage characteristics of the inter-turn fault were analyzed,and the inter-turn fault's mathematical model of the voltage second harmonic compo-nent was derived and established;the discrete wavelet transform was used to analyze the characteristic signals.The voltage second harmonic component was used as the basis for fault monitoring,and the fault phase could be located by assisting with the amplitude of the current.The inter-turn short circuit model of PMSM was established on the Simulink platform,and different fault severities were set to veri-fy the effectiveness of the method.The simulation results show that the signal-to-noise ratio of the volt-age second harmonic is much higher than that of the current harmonic,and the proposed method can quickly detect inter-turn faults and accurately locate the fault phase.