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Frequency and peak induction dependence of eddy current losses in AlSiFe magnetic laminations

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2 Author(s)
Ban, G. ; Hungalu Eng. & Dev. Center, Budapest, Hungary ; Bertotti, G.

The authors present loss separation measurements carried out in AlSiFe (1.7 wt.% Al, 1.9 wt.% Si) nonoriented laminations of thickness 0.22 mm and variable grain size s (24 μm⩽s⩽150 μm) in the frequency range 1 Hz⩽f⩽300 Hz and peak induction range 0.7 T⩽B⩽1.5 T. In agreement with theoretical predictions, the excess loss is found to obey the law Pe =8√σGSV0 (Ff)3/2 , where σ is the electrical conductivity, S is the lamination cross-section area, and G=0.1356. The magnetic field V0 turns out to be proportional to s, so that Pe∝√s, a result already found in previous investigations of SiFe steels. The behavior and absolute value of the product SV0 found in the present experiments with AlSiFe steels are essentially the same as those found in previous studies in SiFe steels. This suggests that the field V0 plays a fundamental role in the relationship between microstructure and power losses of nonoriented electrical steels

Published in:

Magnetics, IEEE Transactions on  (Volume:25 ,  Issue: 5 )

Date of Publication:

Sep 1989

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