To study the electromagnetic compatibility of energy vehicles, the conducted electromagnetic interference (EMI) prediction model of a motor drive system under no-load state is established. The occurrence of EMI in each component of an electric vehicle is discussed along with some mitigation techniques. Further, an EMI filter topology using an LC filter is demonstrated, and the procedure has been verified in two switching power supply control applications. The simulation value of the differential mode interference voltage prediction model is essentially the same as the measured value in the transmitted interference frequency band. Except for a few frequency points, the error is small in most frequency bands, which is about 15%. The values of common mode current simulation and the measured values of the predicted model are essentially the same in the frequency range studied, and the error is about 8% within the allowable range. The horizontal and vertical components of the 10-m electric field on the right side of the car body were modeled in the high-frequency structure simulator program and compared with the results measured in a half-wave anecogenic chamber. The electric field amplitude is basically consistent and can reach approximately 80%, which confirms the accuracy of the vehicle radiation EMI simulation hypothesis.
Cite this article as: Q. Wu, Z. You, J. Li, T. Wu and L. Luo, “Evaluating electromagnetic interference for fault analysis and maintenance in new energy vehicles,” Electrica, 23(2), 357-365, 2023.