On the variation with flux and frequency of the core loss coefficients in electrical machines

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

Research output: Contribution to journalArticlepeer-review

216 Scopus citations


A model of core losses, in which the hysteresis coefficients are variable with the frequency and induction (flux density) and the eddy-current and excess loss coefficients are variable only with the induction, is proposed. A procedure for identifying the model coefficients from multifrequency Epstein tests is described, and examples are provided for three typical grades of non-grain-oriented laminated steel suitable for electric motor manufacturing. Over a wide range of frequencies between 20-400 Hz and inductions from 0.05 to 2 T, the new model yielded much lower errors for the specific core losses than conventional models. The applicability of the model for electric machine analysis is also discussed, and examples from an interior permanent-magnet and an induction motor are included.

Original languageEnglish
Pages (from-to)658-667
Number of pages10
JournalIEEE Transactions on Industry Applications
Issue number3
StatePublished - May 2006


  • Brushless permanent-magnet (PM) motor
  • Core loss
  • Electric machine
  • Epstein test
  • Finite-element analysis (FEA)
  • Induction motor
  • Iron loss
  • Laminated steel

ASJC Scopus subject areas

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


Dive into the research topics of 'On the variation with flux and frequency of the core loss coefficients in electrical machines'. Together they form a unique fingerprint.

Cite this