关键词: 电动汽车, 高频电路模型, 轴电压, 变速箱

Abstract: Based on the different characteristics of the high-frequency and low-frequency signals, a seperate modeling and its estimation method were proposed to predict the capacitive shaft voltage of electric vehicle electric drive systems without power supply. Based on the shaft voltage model, the influence of the transmission gearbox was further considered, and a circuit model of the transmission gearbox was established, which could obtain the shaft voltage estimation of the transmission gearbox shaft and the motor shaft, and realized the shaft voltage modeling and calculation of the electric vehicle electric drive system. The motor shaft voltage was measured through experiments, and the measured motor shaft voltage was compared with the simulation data. The comparison results verified the accuracy of the model.

Key words: electric vehicle( EV), high-frequency circuit model, shaft voltage, transmission gearbox