DocumentCode :
982531
Title :
Computation of Core Losses in Electrical Machines Using Improved Models for Laminated Steel
Author :
Ionel, Dan M. ; Popescu, Mircea ; McGilp, Malcolm I. ; Miller, T.J.E. ; Dellinger, Stephen J. ; Heideman, Robert J.
Author_Institution :
A. O. Smith Corp., Milwaukee
Volume :
43
Issue :
6
fYear :
2007
Firstpage :
1554
Lastpage :
1564
Abstract :
Two new models for specific power losses in cold-rolled motor lamination steel are described together with procedures for coefficient identification from standard multifrequency Epstein or single sheet tests. The eddy-current and hysteresis loss coefficients of the improved models are dependent on induction (flux density) and/or frequency, and the errors are substantially lower than those of conventional models over a very wide range of sinusoidal excitation, from 20 Hz to 2 kHz and from 0.05 up to 2 T. The model that considers the coefficients to be variable, with the exception of the hysteresis loss power coefficient that has a constant value of 2, is superior in terms of applicability and phenomenological support. Also included are a comparative study of the material models on three samples of typical steel, mathematical formulations for the extension from the frequency to the time domain, and examples of validation from electrical machine studies.
Keywords :
eddy current losses; electric motors; laminations; machine theory; magnetic cores; magnetic leakage; steel; cold-rolled motor lamination steel; core losses; eddy-current loss; electrical machines; hysteresis loss; laminated steel; multifrequency Epstein tests; power losses; single sheet tests; Building materials; Core loss; Electric machines; Frequency; Hysteresis motors; Industry Applications Society; Lamination; Mathematical model; Steel; Testing; Brushless permanent-magnet (BLPM) motor; Epstein test; cold-rolled motor lamination steel; core loss; electric machine; finite-element analysis (FEA); interior permanent-magnet (IPM) motor; iron loss;
fLanguage :
English
Journal_Title :
Industry Applications, IEEE Transactions on
Publisher :
ieee
ISSN :
0093-9994
Type :
jour
DOI :
10.1109/TIA.2007.908159
Filename :
4384995
Link To Document :
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