异步电动机定转子故障检测的交互影响

研究了异步电动机定转子故障检测的交互影响问题。从电磁感应角度揭示出转子故障影响定子故障检测的原因，即转子故障导致定子电流出现边频分量，在其调制作用之下，常规定子电流负序分量算法的计算结果将出现“负序分量”，而定子电流负序分量是定子故障的典型特征。从电磁感应角度讨论了定子故障对转子故障检测的影响问题，并对该影响做了定量分析，指出匝间短路故障确实导致定子电流出现边频分量，而定子电流边频分量是转子故障的典型特征，因此在理论上定子故障将影响转子故障的检测；但轻微甚至某些严重匝间短路故障所导致的定子电流边频分量幅值远远小于转子故障所导致的定子电流边频分量，实际上并不会对转子故障检测产生影响。

Inter-influence on Stator and Rotor Fault Detection in Induction Motors

This paper addresses itself to the inter-influence on the stator and rotor fault detection in induction motors. The reason why the detection of stator fault is influenced adversely to a certain extent by rotor fault is clearly revealed by study based on the electromagnetic mechanism. Rotor fault results in edge frequency components emerged in stator current. The conventional algorithm of negative sequence component of stator current, which is usually regarded as the most typical indicator of stator fault, gives rise to a false negative sequence component due to the modulation of edge frequency components in stator current, and might influence the detection of stator fault. The problem whether stator fault influences the detection of rotor fault or not is quantitatively discussed on the standpoint of electromagnetic mechanism, and a few interesting conclusions have been drawn. Namely, stator fault indeed results in edge frequency components emerged in stator current, which is usually regarded as the most typical indicator of rotor fault, and thus influence the detection of rotor fault in theory. However, the amplitudes of the edge frequency components derived from incipient even some severe stator fault are rather small with respect to those derived from rotor fault, and not be detectable from the practice’s point of view, and thus do not confuse the indicator of rotor fault.