Calculation and analysis of PWM harmonic current of multiphase linear induction motor
PWM harmonic current is the main cause of high-frequency motor vibration,and thus its fast and accurate calculation is the key to analyzing high-frequency motor vibration.An analytical cal-culation method for PWM harmonic current in multiphase LIM(linear induction motors)was pro-posed.Firstly,the high frequency equivalent circuit topology was established according to the electro-magnetic field characteristics of LIM under high frequency excitation.And then,the two-dimensional electromagnetic field model of LIM was established,and the high-frequency equivalent circuit parame-ters were calculated based on the energy method.Furthermore,the relationship between PWM har-monic current and winding current phase,harmonic current order and harmonic current frequency was analyzed.Finally,the correctness of the calculation method and the conclusions were verified based on static blocking experiments.This method,which greatly reduces the time cost compared to the finite element method,is suitable for the motor optimization design period and is also applicable to rotating motors.
linear induction motorPWM harmonic currentelectromagnetic field modelhigh-frequency equivalent circuit
万方数据
维普
