Accurate and Broadband Three-Phase Motor Modeling Methodology Based on Vector Fitting

An accurate and broadband modeling methodology for a typical permanent magnet synchronous motor (PMSM) in a vehicular three-phase braking system is proposed for the first time to improve the accuracy of induced electromagnetic interference (EMI) in three-phase motor systems. The proposed model is verified by measurement from dc to 120 MHz both in common- and differential-mode current measurement of the three-phase motor under study. The proposed model can be used in analysis and prediction of the electromagnetic noise of the motor-drive braking system. The model can also be incorporated into frequency- and time-domain simulations. The modeling approach is based on the vector fitting technique of measured three-phase motor impedance andS-parameter, where the three-phase PMSM is modeled as a multiport device. In addition, the proposed modeling method for the PMSM can be used for different types of three-phase motors for EMI simulations and analysis.