Separation of the losses in 0.203 to 0.226 mm thick high-permeability steels with and without scribing

Abstract

The loss vs. frequency curves for nominal 0.22 mm thick high-permeability oriented silicon steels in both the annealed and scribed conditions are closely predicted by a mathematical formula describing a stochastic process. The scribing resulted in about an 8 percent reduction in losses, essentially all of which was accounted for by reductions in the nonclassical (domain-wall-related) eddy-current losses. At 1.5 T and below, slight reductions in hysteresis losses may even occur with scribing, although those reductions were a small part of the total loss reduction. The eddy-current loss reduction accompanied a reduction in average static domain-wall spacings of 16 to 20 percent.