三相电机驱动系统EMI滤波器的研究

摘要

In order to protect the normal operation of the motor system,an EMI suppression method for three-phase motor drive system based on impedance balance is proposed.The impedance balance adopts the technique of changing the converter topology.The noise source is placed in the center of Wheatstone bridge to reduce the input Common-mode current through the use of passive components to establish EMI suppression system model.Finally,the correctness of the theoretical analysis and the effectiveness of the proposed method are verified by simulation and experiment.The results show that this method can effectively prevent EMI from the motor drive system.%电机驱动系统在现代工业领域中应用十分广泛.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电磁干扰.为了保护电机系统的正常运行,因此要对电机驱动系统进行电磁干扰的抑制.针对这种问题提出了一种基于阻抗平衡的三相电机驱动系统电磁干扰抑制方法,阻抗平衡的方法采用了改变变换器拓扑结构的技术,将噪声源放置在惠斯通电桥的中心来减小输入共模电流,通过使用无源元件建立电磁干扰抑制系统模型.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电磁干扰从电机驱动系统中传播出去.