High-Frequency Modelling of Electrical Machine Windings Using Numerical Methods

Abstract

This paper presents a method for predicting highfrequency 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.

Sensitivity Analysis of a Numerical High-Frequency Impedance Model for Rotating Electrical Machines

“…A general script interfaces the FEM obtained parameters with the SPICE software and extracts the input impedance of the circuit. Further details about the modelling method are presented in [14]- [16].…”

“…In [14] a model exclusively utilizing the machine crosssection, conductor distribution and material characteristics was presented and validated. The latter model allows the early-stage broadband impedance estimation with no need of experimental tuning.…”

“…This work analyzes the impact of early-stage design decisions on the high-frequency impedance response for the two main propagation modes. The adopted methodology is described in [14]. The sensitivity analysis is performed to test the model capabilities and to provide a better understanding of its application.…”

High-Frequency Modelling of Electrical Machines for EMC Analysis

“…FEM machine models have previously been proposed for the design stage [17][18][19][20][21][22][23][24][25][26]. These models are mainly based on 2D FEM simulations, which model all the strands of the coils but require high computational capabilities and long simulation durations.…”

Impedance Modeling Oriented Toward the Early Prediction of High-Frequency Response for Permanent Magnet Synchronous Machines

“…Results about the extraction of the different multiconductor transmission line parameters were not presented and discussed in this work. In [24] a completely numerical methodology to predict both CM and DM impedances was introduced for a case study PMSM. However, the impedance measurement did not cover the resonant frequency band.…”