Electromagnetic interference prediction technology of new energy motor drive system

New energy vehicles in the running process inevitably produce common and differential modes such as electromagnetic interference (EMI), to forecast motor drive system. This paper analyses the mechanism of EMI, and to find out the EMI sources and transmission ways, motor drive system for motor disturbance component modelling analysis is done, along with EMI test. The results show that the difference between the peak value and the minimum value of conducted radiation increases with the increase of current and has no relation to the frequency. Both near-field radiation and current are related to frequency. With the increase of current intensity, radiation intensity migrates from low frequency to high frequency, and the gap between the peak value and the minimum value also increases.