Title: Modelling of the wide frequency equivalent circuit of the three-phase AC motor based on vector fitting method
Authors: Lihui Li; Wen He; Yingcong Wang; Xu Li
Addresses: School of Mathematics and Statistics, Southwest University, Chongqing 400715, China ' China Chang'an Automotive Engineering Institute, Chongqing 401120, China ' State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing 400044, China ' China Chang'an Automotive Engineering Institute, Chongqing 401120, China
Abstract: The prediction of conducted interference in the motor drive system is an important part of the automotive electromagnetic compatibility (EMC) analysis. The accuracy of motor electromagnetic interference (EMI) model directly affects the accuracy of conducted interference prediction. For this purpose, based on the measured data, this paper proposes a broadband equivalent circuit model for three-phase AC motors. The motor is regarded as a single-port network, and its common mode and differential mode impedances are measured. Combining the measured data, a rational function expression is established by the vector fitting method. The influence of different fitting orders is analysed under different parameters, and then an equivalent circuit model of the three-phase AC motor is established. The comparison between simulation and experiment shows that the modelling method is simple, accurate, and highly applicable.
Keywords: EMI model; measurement data; vector fitting method; AC motor.
International Journal of Electric and Hybrid Vehicles, 2019 Vol.11 No.1, pp.12 - 22
Received: 22 Aug 2018
Accepted: 30 Sep 2018
Published online: 25 Mar 2019 *