Author(s)

S. Williamson, M.A. Mueller, C.I. McClay & D.R. Gersh

Abstract

A finite element based method for calculating cage induction motor rotor impedances S. Williamson/ M.A. Mueller," C.I. McClay,* D.R. Gersh* "Department of Engineering, University of Cambridge, Cambridge, UK * Brook Hanson, St. Thomas' Road, Huddersfield, West Yorkshire, 1 Introduction The per-phase equivalent circuit of the induction motor is employed univer- sally by industrial motor designers. Design programs routinely calculate the equivalent circuit parameters, and estimate performance using equivalent- circuit calculations. A corollary of this is that designers tend to think of design changes in terms of the effect that they will have on the equivalent cir- cuit components with their effect on performance being consequential. The accurate calculation of those circuit components therefore assumes some importance. The components themselves are highly non-linear, varying due to both iron saturation and skin effect in the embedded conductors. Their calculation can be facilitated by

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