三相异步电机匝间短路故障的诊断方法

Diagnosis Method of Inter-turn Short Circuit Fault of Three⁃phase Induction Motor

三相异步电机是各类电机中应用量最大的一种,匝间短路故障为三相异步电机发生概率较大的一类故障。如果能实时监测电机运行状况,对运行进行健康安全评估,将能及时止损,减少损失。提出了基于扩展Clarke变换和故障特征因子Q的匝间故障诊断方法,分析了电机匝间故障的Clarke矢量的特点,对电机匝间故障的Clarke矢量取模,得到三相电流中对称分量的直流分量和2倍于基频的交流分量,以该分量的幅值与直流分量的比值作为故障特征因子Q进行匝间故障诊断。通过特征因子Q研究Clarke矢量频谱,从而判断电机故障,并且进行了理论仿真以及样机测试。

Three-phase asynchronous motor is one of the most frequently used motors.Inter-turn short circuit fault is a kind of fault with high probability.If the real-time monitoring of motor operation,health and safety evaluation of the operation,will be able to timely stop losses,reduce losses.An inter-turn fault diagnosis method was proposed based on extended Clarke transform and fault characteristic factor Q,analyzed the characteristics of Clarke vector of inter-turn fault of motor,modulated the Clarke vector of inter-turn fault of motor,and obtained the DC component of symmetrical component and the AC component twice the fundamental frequency in the threephase current.The ratio of the amplitude of the component to the DC component was used as the fault characteristic factor Q to diagnose the inter-turn fault.Clarke vector spectrum was studied by characteristic factor Q,so as to judge the motor fault,and theoretical simulation and prototype test were carried out.