交流电动机转子故障的计算机仿真和理论分析

Computer Simulation and Theoratical Analysis of Rotor Trouble in AC Motor

对交流电动机转子回路发生故障,造成转子回路不对称时的定子电流进行计算机仿真。仿真结果表明,定子电流不是等幅正弦波,而是受低频信号调制的调幅波。若对此调幅波进行频谱分析,必然存在两个边频分量。经理论分析后指出,边频分量的频率与电动机的转差率有关,因此检测定子电流频谱中的边频分量是诊断交流电动机转子回路发生故障的依据。

When the rotor of AC motor has trouble, the stator current will not be symmetrical. Computer simulation proves that this stator current will not be continuous sinusoidal wave. So defecting stator current can diagnose rotor troubles.