Eur. Phys. J. Appl. Phys. 49, 31101 (2010)
https://doi.org/10.1051/epjap/2010003

Eddy-current formulation for constructing transmission-line models for machine windings ^*,**

¹ Katholieke Universiteit Leuven, Faculty of Science, Belgium
² Technische Universität Darmstadt, Institut für Theorie Elektromagnetischer Felder, Germany
³ Technische Universität Darmstadt, Institut für Elektrische Energiewandlung, Germany

Corresponding author: herbert.degersem@kuleuven-kortrijk.be

Received: 12 December 2008
Accepted: 19 November 2009
Published online: 3 February 2010

Abstract

In this paper, an eddy-current formulation is used to determine the transmission-line parameters of a machine winding. It is shown that this formulation covers a broader frequency range than the commonly used low-frequency magnetostatic and high-frequency magnetodynamic approximations. The eddy-current formulation, however, suffers from large computation times and may lead to severe inaccuracies if the finite-element mesh does not resolve the skin depth, a modelling concern that does not exist for the traditional formulations. The three finite-element models are compared according to the accuracy of the resulting transmission-line model applied to the winding of a permanent-magnet synchronous machine.