一种开关磁阻电动机功率变换器故障诊断方法

针对现有开关磁阻电动机功率变换器故障诊断方法存在可靠性不高等问题,提出了一种新型的功率管故障诊断方法。该方法以不对称半桥型功率变换器主电路为研究对象,以常见的功率管开路和短路2种故障情况为诊断对象,通过比较母线电流估算值和实测值来判断故障,结合故障相绕组电流实现故障相的识别,必要时通过中断测试来确定故障点。选取电动机空载、低速度和高速度运行等较难实现故障诊断的工况进行了试验分析,结果表明,该方法均能完成故障类型的定性及故障点的准确定位。

A fault diagnosis method of power converter of switched reluctance motor

For low reliability of existing fault diagnosis method of power converter of switched reluctance motor,the paper proposed a new type of fault diagnosis method of power tube.The new method takes main circuit of asymmetric half-bridge power converter as study object,and two kinds of common faults of open circuit and short circuit of power tube as diagnosis objects.It determines fault by comparing estimate value and actual value of bus current,achieves identification of fault phase combiningwith winding current of fault phase,and determines fault point by interrupting test if necessary.The paper selects conditions which are difficult to achieve fault diagnosis of motor operation with no-load,low-speed and high-speed for experiment and analysis,and the results indicate that the proposed method can complete accurate determination of fault type and location of fault point.