Parametric description of power loss in soft magnetic materials with unbiased, rate-independent hysteresis loops

Abstract

This paper develops a parametric model describing power loss per unit volume, PV, on unbiased minor loops, in the low frequency limit, using the corresponding remanence Br, coercivity Hc, saturated field value BS and power loss per unit volume PVS, from the major loop. In the saturating regime where Hmax>Hc, PV scales as BSHc, and depends on BrHmax/(BSHc), with Hmax the maximum value H on the minor loop. In the intermediate regime where Hmax<Hc, PV scales as μ0μiHc2, and depends on Hmax/Hc. For composite magnetic materials, a major loop may be inaccessible, in which case an expression is obtained for the low field regime, where PV scales as Hmax2, and depends on the initial relative permeability μi. The models are in good agreement with published experimental data. Observed deviations are explained through experimental uncertainties and limitations of the model.