Managing eddy current losses and ferromagnetic material nonlinearities in distorting regimes

The paper is based on an advanced time-domain modeling technique of eddy currents and their power losses in ferromagnetic cores for inductors, transformers or any electric machine, working in strongly distorted regimes, including switching regimes, as in drive systems. Thus, the eddy currents´ parasitic magnetic field and the nonlinearity given by the manufacturer of the ferromagnetic material are rigorously considered. The main principle is the well-known modeling of a magnetic circuit through electric lumped circuits, based on the formal similarity between the magnetic field and electric field laws. The model is suitable to be included in a time-domain circuit simulator, like SPICE, as well as in a Simulink-based modeling, in order to simulate the whole circuit that includes the magnetic core. The simulation accuracy is accomplished both in steady-states and transient regimes.