TEXTURE DEPENDENCE OF POWER LOSSES IN NONORIENTED SIFE ELECTRICAL STEELS

Epstein-frame loss measurements were performed on 3.2% Si-Fe nonorient ed strips cut along and transverse to the rolling direction, in the fr equency range 10-100 Hz and at various peak inductions between 0.3 and 1.6 T. The behavior of hysteresis loss P(h) and excess loss P(e) vs p eak induction B and frequency f was worked out and analyzed. The B dep endence exhibits a rich structure, as a consequence of the coupling be tween magnetic domains and the grain structure. The f dependence follo ws the law P(e) proportional-to f3/2, in agreement with previous exper iments. These results are interpreted in the frame of a generalized Pr eisach model recently proposed. It is shown that the excess loss depen dence on B is in direct relation with that of the permeability B/H alo ng the virgin magnetization curve. The results of numerical calculatio ns of model predictions are presented and discussed in comparison with experimental data.