基于CWTHHT结合的永磁同步电机失磁故障诊断方法及其可行性分析

永磁同步电机失磁故障是驱动电机故障中最为严重的故障之一。失磁故障意味着永磁同步电机的优势显著降低。提出了基于CWT-HHT结合的永磁同步电机失磁故障诊断方法并对其可行性进行了分析。首先简要分析了永磁同步电机稳态运行特性、搭建电机故障试验平台,实时采集电机正常及失磁时的定子电流信号;然后通过信号分析得出:失磁故障下电流信号的EMD分解分量imf4的周期性较正常情况时变差,而且分量imf3所占比例较正常情况时变大;失磁故障下电流信号的HHT图中基波频带较正常情况能量分散了。因此,基于CWT-HHT结合的故障诊断方法是可行的。

Diagnosis Method Based on CWTHHT of DemagnetizationFault for Permanent Magnet Synchronous Motorand Analyzing Its Feasibility

Demagnetization fault of permanent magnet synchronous motor was one of the most serious fault in motor fault. Demagnetization fault meant that the advantages of permanent magnet synchronous motor was significantly decreased. Put forward a diagnosis method based on CWTHHT of demagnetization fault for permanent magnet synchronous motor and analyzing its feasibility. Firstly, the steady state operation characteristics of permanent magnet synchronous motor were briefly analyzed, experimental platform of motor fault set up, stator current signal of normal and demagnetization of motor collected in real time; Then, the comparison and the analysis showed that the periodicity of component imf4 of current signal EMD decomposition under the demagnetization fault was worse and component imf3 accounted for a large proportion compared with the normal condition. The energy of the fundamental frequency band of current signal of the demagnetization fault was scattered. Therefore, the fault diagnosis method based on CWTHHT was feasible.