变频供电异步电动机转子断条故障诊断

Fault Diagnosis for Broken Rotor Bar in Induction Motor Supplied by a Converter

异步电动机转子断条故障发生时,定子电流(变频器输出侧电流)中会出现对称频率(1±2s)f1(f1为定子电流频率)的故障特征附加电流信号。以此为依据,定子电流特征频谱分析(MCSA)发展为经典转子断条故障在线检测方法。在工程实际过程中,变频供电异步电动机容易采集到的信号是开关柜二次侧供电电流(变频器输入侧电流),因此要实现变频异步电动机转子断条故障诊断,必须清楚供电电流中是否也含有断条故障特征信息。首次对变频异步电动机供电电流进行分析,得出供电电流中也包含转子断条故障特征信息的结论,以此为基础,利用连续细化傅立叶和自适应滤波相结合的方法,实现了变频异步电动机转子断条故障诊断。

There are symmetrical frequency fault feature additional current signal arising in stator current when induction motor associates with broken rotor bar.According to this,motor current signature analysis developed classical online detection method of broken rotor bar fault.On engineering real progress, the convenient acquisition signal is the secondary current of cubicle switchboard,namely power supply current in induction motor variable frequency drive system.Therefore,to achieve online detection for broken rotor bars of frequency control motor,it is necessary to know that there is fault feature current information in power supply current or not.This paper analyses power supply current for the first time,derives that power supply current includes broken rotor bar fault feature information.Base on the conclusion,to achieve broken rotor bar fault diagnosis of frequency control motor using by method blending continuous subdivision Fourier transform and self-adaptive filter.