A Controlling Method of Motor-Terminal Surge Voltage and Induced-Electromagnetic Interference Noise for Electric Vehicles

Abstract

This paper describes a controlling method of motor-terminal surge voltage and induced-electromagnetic interference (EMI) noise which is effective in electric vehicles (EVs) with high density packaging structures. First, high frequency circuit parameters (HFCPs) to influence surges occurring at the motor terminals when a motor is connected to a pulse width modulation (PWM) inverter with short leads are clarified through transient circuit analyses and experiments. Then, a controlling method of the surge voltage and induced-EMI noise is proposed which uses a multi-layer power printed circuit. By applying the clarified HFCPs to an equivalent circuit expressing the multi-layer power printed circuit, damping resistance and bypass capacitance for suppressing surge voltage and the induced-EMI noise are determined. The effectiveness of the surge voltage and EMI noise controller using the values obtained through the analyses is verified through simulations and experiments.

Investigation of Engine Based Electromagnetic Interference for Electric Vehicular Communications Systems

“…The model of surge circuit for motor terminal has been presented in [3]. In this model, a sudden change in voltage will generate a potential difference at both ends of surge circuit.…”

“…To reduce the impact of EMI, some anti-EMI schemes have been proposed in [2]. In addition, [3] has presented some EMI suppression methods to decrease the impact of EMI. Various types of transmission lines have been studied to decrease the EMI effect [4], where the shielding is investigated.…”