现代工业领域中广泛采用的PwM电机驱动系统，因功率变换器调制策略的原因，将不可避免地形成传导共模EMI，并且其危害程度要远大于差模EMI的危害程度，是EMI问题的研究热点。详细分析了PwM电机驱动系统传导共模EMl抑制技术的研究现状，并在此基础上给出了典型方法存在的不足，及抑制技术的发展趋势。关键词：传导共模EMI；PWM功率变换器；EMI发射强度；EMI传播途径；EMI滤波器Abstmct：PWM motor drive system is widely applied to industrial domai儿However，owing to power converter adopts pulse width modulation，which inevitably causes conducted common mode EMI． Hamful degree of common mode EMI is much greater than that of differential mode EMI，so common mode interference is the research focus of EMI．The study status arld development trend of conducted common mode EMI suppression technology of PWM motor drive system was analyzed and the deficiency of typical suppression method waspresented．
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