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

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 Epstei...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2006-05, Vol.42 (3), p.658-667
Main Authors: Ionel, D.M., Popescu, M., Dellinger, S.J., Miller, T.J.E., Heideman, R.J., McGilp, M.I.
Format: Article
Language:English
Subjects:
Brushless permanent-magnet (PM) motor
Core loss
Eddy current testing
electric machine
Electric machines
Electric motors
Epstein test
Finite element methods
finite-element analysis (FEA)
Flux
Flux density
Frequency estimation
Hysteresis
Hysteresis motors
induction motor
Induction motors
iron loss
laminated steel
Mathematical models
Steel
Testing
Virtual manufacturing
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Summary: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.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2006.872941