Experimental test of loss calculations for thin laminations in the presence of normal sinusoidal flux

Recently a variational procedure was developed for calculating losses in thin laminations of any shape in the presence of sinusoidal flux directed normal to the lamination plane. The results for a variety of shapes showed that these losses do not depend on the magnetic characteristics of the lamination material but only on the resistivity. The loss formula is tested experimentally for rectangular shaped laminations for a variety of magnetic and nonmagnetic materials. We obtained good agreement with the prediction both in terms of parameter dependencies and absolute numerical values of the specific losses.