Hysteresis modelling of NiZn-Ferrites

The energetic model of ferromagnetic hysteresis (EM) is applied to typical MnZn-ferrite-material. The EM simulates hysteresis loops from the demagnetised state up to saturation, including all sorts of major and minor loops and their dependence on the rate of change with time. Due to the high specific resistivity of ferrites the hysteresis losses dominate the losses of ferrite components, even at high frequencies. The EM is used to directly determine hysteresis losses for small excitations by a Rayleigh-law-approximation. The simulation results are compared to measurements on a typical commercial MnZn-ferrite-torus.