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Model of laminated ferromagnetic cores for loss prediction in electrical machines

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6 Author(s)
P. Rasilo ; Department of Electrical Engineering, Aalto University School of Electrical Engineering, P.O. Box 13000, FI-00076 Aalto, Finland ; E. Dlala ; K. Fonteyn ; J. Pippuri
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An iron-loss model for laminated ferromagnetic cores of electrical machines is presented and applied to estimate the core losses of an induction machine with finite-element analysis. Skin effect in the cross section of the core lamination is modelled using a set of sinusoidal basis functions while locally considering both the hysteretic material properties and the excess field caused by domain wall motion. After spatial and time discretisation, a single non-linear equation system is obtained. An accurate vector Preisach model, the differential reluctivity tensor and the Newton-Raphson method guarantee excellent convergence of the iteration procedure. Results from the model correspond well to iron-loss data obtained by measurements.

Published in:

IET Electric Power Applications  (Volume:5 ,  Issue: 7 )