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Power losses in magnetic laminations with hysteresis: Finite element modeling and experimental validation

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7 Author(s)
Basso, V. ; IEN Galileo Ferraris, INFM and GNSM, C. so Massimo d’Azeglio 42, 1025 Torino, Italy ; Bertotti, G. ; Bottauscio, O. ; Fiorillo, F.
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Dynamic hysteresis loop shapes and magnetic power losses are studied in nonoriented Fe-Si laminations exhibiting significant excess losses. Measurements are carried out under controlled sinusoidal induction in the frequency range from 1 Hz to 1.6 kHz, at various peak inductions from 0.25 to 1.5 T. Excess losses are found to obey a f3/2 law up to frequencies of 200–400 Hz, depending on peak induction. Beyond this limit, definite deviations are observed, due to eddy current shielding. Detailed information on the flux and field distribution in this high frequency regime is obtained by finite element solutions of Maxwell equations employing the dynamic Preisach model to describe quasi-static hysteresis and dynamic wall processes. The agreement between theoretical predictions and measurements is discussed. © 1997 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:81 ,  Issue: 8 )