PWM电机驱动系统EMI抑制技术研究

The Research of EMI Suppression Technology of PWM Motor Drive System

随着电力电子技术的迅速发展,PWM(pulse width modulation)电机驱动系统在现代工业领域中得到了广泛的应用.但是,由于功率变换器控制策略的原因,将不可避免地形成传导共模EMI(electromagnetic interference),其危害远大于差模EMI.针对这些问题提出了一种基于阻抗平衡的EMI抑制方法,阻抗平衡的方法采用了改变变换器拓扑结构的技术,通过使用无源元件建立EMI抑制系统模型.最后,通过仿真及实验对理论分析的正确性及所述方法的有效性进行验证.结果表明该方法可以有效地阻止了EMI从电机驱动系统中传播出去.

With the rapid development of power electronic technology, PWM （Pulse Width Modulation） motor drive system has been widely used in the field of modem industry. However, it will inevitably form conduction common-mode EMI （ Electromagnetic Interference）. Because of the power converter control strategy, the harm is greater than the differential mode EMI. This paper puts forward a kind of EMI suppression method based on the impedance balance to solve this issue. The method of impedance balance builds the EMI suppression system method through changing the converter topology using the passive components. Finally, the simulation and experiment are built to demonstrate the correctness of the theoretical analysis and describes the effectiveness of the proposed method. The results show that this method can prevent effectively the EMI spread-out of the motor drive system.