Analytical formulation to estimate the dynamic energy loss in electrical steels: Effectiveness and limitations

This article aims to investigate the accuracy in modeling and characterization of the dynamic energy loss of modern laminated electrical steels in use for power electronics applications. Measurements by an Epstein Frame are performed in case of sinusoidal and non-sinusoidal waveform of the magnetic induction, at different frequencies and peak values. The Steinmetz and the time domain statistical loss theory, either in frequency domain are used, and the related parameters are fitted experimentally. The dynamic energy loss is also modeled and estimated by means of a finite element method (FEM) formulation in time domain, coupled with a vector Preisach model to represent the constitutive law of the magnetic material. The series of the results reported indicates effectiveness and limitations of the modeling approaches considered. Some considerations about the excess loss are also given.