The paper presents an efficient numerical procedure, which estimates the hysteresis losses in the FeSi materials, for periodic nonsinusoidal magnetic field having the harmonic spectrum revealed by industrial measurements made for transformers supplying various consumers. The used hysteresis model is a scalar classical Preisach model, its statistical distribution function being identified from the symmetrical cycles, measured by an industrial equipment – a single sheet tester (SST). The numerical procedure is adapted to the soft magnetic material, by using a nonuniform meshing of Preisach triangle.

Keywords: Hysteresis losses, Nonsinusoidal regime, Harmonics, Preisach hysteresis model, Single sheet tester