基于小波变换的永磁同步电动机逆变器故障检测仿真研究

摘要

针对永磁同步电动机驱动系统中逆变器功率管开路故障进行了仿真研究,采用小波变换对电动机转速信号进行时间-频率域分析,并将其与傅里叶变换进行对比研究,分析结果表明,小波变换可以精确地检测出逆变器发生故障的时间点.该研究对提高系统运行可靠性具有重要指导意义.%Aiming at the open-circuit fault of transistors in the inverter of the permanent magnet synchronous motor drive system, this paper perfomed a simulation study,in which wavelet transform was used to analyze the signal of the running speed of the motor in the time-frequency domain. Comparative study with Fourier transform was carried out. Results show that wavelet transform can accurately detect the time of fault in the inverter. This study has guiding significance in improving the system reliability.