Frequency and peak induction dependence of eddy current losses in AlSiFe magnetic laminations
1989; IEEE Magnetics Society; Volume: 25; Issue: 5 Linguagem: Inglês
10.1109/20.42498
ISSN1941-0069
Autores Tópico(s)Microstructure and Mechanical Properties of Steels
ResumoThe 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 mu m<or=s<or=150 mu m) in the frequency range 1 Hz<or=f<or=300 Hz and peak induction range 0.7 T<or=B<or=1.5 T. In agreement with theoretical predictions, the excess loss is found to obey the law P/sup e/=8 square root sigma GSV/sub 0/ (Ff)/sup 3/2/, where sigma is the electrical conductivity, S is the lamination cross-section area, and G=0.1356. The magnetic field V/sub 0/ turns out to be proportional to s, so that P/sub e/ varies as square root s, a result already found in previous investigations of SiFe steels. The behavior and absolute value of the product SV/sub 0/ 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 V/sub 0/ plays a fundamental role in the relationship between microstructure and power losses of nonoriented electrical steels. >
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