Improved High-Frequency Modeling of PMSM Using 3-D Finite Element Analysis

Abstract

In this paper, A detailed high-frequency lumped parameter circuit model of Permanent Magnet Synchronous Motor (PMSM) is proposed for using in conducted Electromagnetic Interference (EMI) studies at the frequency range of 100 Hz to 10 MHz. Parameters of the proposed model are determined using the measured Common-Mode (CM) and Differential-Mode (DM) impedance characteristics of the PMSM and physics-based 3-D Finite Element Analysis (FEA) eddy-currents simulation of the iron-core. Winding resistances, parasitic capacitances, leakage inductances and inter-turn effects of the stator winding are determined from the measurement data. However, the measurement data is not enough to determine the unknown parameters which represent the high-frequency behavior of the iron-core. Using 3-D FEA gives the ability to model the complex mid-frequency behavior of the motor by including the core-loss and eddy-currents effects of the iron-core. Results show a good agreement for both CM and DM impedance characteristics modeled by the proposed method and the measurement data for the desired frequency of conducted EMI studies.