High-Frequency Modelling of Electrical Machine Windings Using Numerical Methods

This paper presents a method for predicting high-frequency behavior of rotating electrical machines. An approach using the Finite Elements (FE) method coupled with a circuit simulator is utilized to obtain the machine common-mode and differential-mode impedances over the frequency range of interest. The machine geometry, winding configuration and material characteristics are the input for the proposed process. 2D electrostatic FE simulation is used to obtain the capacitive couplings while a magnetodynamic FE approach is used to obtain the frequency-dependent resistances and inductances. These parameters are used in an equivalent circuit that represents the machine stator winding layout. A Permanent Magnet Synchronous Machine (PMSM) is used as a case study machine to implement the method. The agreement between the simulated model and experimental results is presented assessing the accuracy of the method.