THE APPLICATION OF THE PREISACH MODEL IN MAGNETODYNAMICS - THEORETICAL AND PRACTICAL ASPECTS

In this paper the computation of the magnetodynamic fields in ferromagnetic laminations is discussed. The fields are governed by a diffusion type of equation, modelling the hysteresis and eddy current effects in the lamination. It is shown that the hysteresis effects should be taken into account properly while solving the equation. Using a single-valued approximation for the material characteristic during the computations, and introducing hysteresis post-hoc, allows considerable computational savings, but leads to inaccurate results. Various time-stepping schemes are discussed with regard to the computational effort they require to solve the diffusion equation. Finally, measurements are given that show good agreement with the computations, if the latter are carried out properly.