电动汽车电机驱动系统的共模电磁干扰

针对电动汽车中存在的电磁兼容问题,深入探讨了干扰车载网络与电器的主要因素——共模传导干扰的产生机理.对电机驱动系统中两个产生电磁干扰的重要环节:发电过程中的整流电路和PWM逆变器建立了共模干扰模型. 对它们产生的共模干扰电流进行了理论计算,并通过对比计算结果和实验结果,验证了模型建立的正确性. 通过对CAN网络的电磁敏感性进行理论和实验分析,证明了电动汽车电机驱动系统产生的电磁干扰已经大大超出CAN网络的电磁兼容能力,并给出了将抗电磁干扰能力更强的下一代车载总线标准FlexRay作为新能源汽车的车载总线的解决方案. 

Common-Mode EMI of Motor Driving System in EVs

Aiming at the problems of electromagnetic compatibility (EMC) in electric cars, the electromagnetic environment of a domestic electric vehicle (EV) was studied. The mechanism of common-mode electromagnetic interference (EMI) was discussed thoroughly to analyze the main factors disturbing the function of in-vehicle network and electric appliances. And the models were established for the two main common-mode EMI sources: AC generator rectifier system and pulse width modulation (PWM) inverter, and they were verified by comparing the calculated and experimental results. Based the theory and experiment analysis of the electromagnetic sensibility of CAN, it was showed that the EMI intensity produced in electric vehicle drive system had far exceeded the electromagnetic compatibility of CAN network. Finally, a standard FlexRay was presented for the in-vehicle network as a solution of new generation EVs.