Computation of core losses in electrical machines using improved models for laminated steel

Dan M. Ionel, Mircea Popescu, Malcolm I. McGilp, T. J.E. Miller, Stephen J. Dellinger, Robert J. Heideman

Research output: Contribution to journalArticlepeer-review

221 Scopus citations


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.

Original languageEnglish
Pages (from-to)1554-1564
Number of pages11
JournalIEEE Transactions on Industry Applications
Issue number6
StatePublished - Nov 2007

Bibliographical note

Copyright 2008 Elsevier B.V., All rights reserved.


  • Brushless permanent-magnet (BLPM) motor
  • Cold-rolled motor lamination steel
  • Core loss
  • Electric machine
  • Epstein test
  • Finite-element analysis (FEA)
  • Interior permanent-magnet (IPM) motor
  • Iron loss

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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