Simulation of wave propagation effects in machine windings

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Abstract
Purpose – The purpose of this paper is to offer a simulation method for predicting the impedance of machine windings at higher frequencies. Design/methodology/approach – A transmission-line model (TLM) is developed based on parameters calculated on the basis of electroquasistatic and magnetoquasistatic finite-element (FE) model of the winding cross-section. Findings – The FE formulations for the low- and high-frequency limits give acceptable results for the respective frequency ranges. An eddy-current formulation is only accurate on a broader region when the FE mesh is sufficiently fine to resolve the skin depth. Research limitations/implications – The paper is restricted to frequency-domain simulations. Practical implications – The results of the paper improve the understanding of higher-frequency parasitic effects in electrical drives with long windings. Originality/value – The paper shows the limitations of the FE methods used for determining the parameters of the TLMs and remedies to avoid these.

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