High-frequency equivalent model of AC motor for electric vehicle drive system

The application of the motor drive system in electric and hybridelectric vehicles can lead to a significant increase in electromagnetic compatibility (EMC). The AC motor as an important part of motor drive system must be considered. In this paper, a high-frequency modelling method of the AC motor is presented. The modelling method consists of deriving the motor model parameters from mathematical resolution of the electrical circuit equations and observation of the variations of the motor impedance with the frequency. All parameters of the proposed models are obtained by Differential Mode (DM) and Common Mode (CM) impedance measurement in frequency domain. The model is verified by impedance measurement of a synchronous motor. The method proposed in the paper can be used to obtain a highfrequency equivalent circuit of an AC motor and predict conducted electromagnetic interference in motor drive system. Copyright © 2013 Inderscience Enterprises Ltd.