EDDY CURRENTS IN FERROMAGNETIC SHEETS TAKING MAGNETIC HYSTERESIS NONLINEARITIES INTO ACCOUNT

The paper deals with the numerical solution of the diffusion problem getting for the time varying electromagnetic field in ferromagnetic and conductive media. It presents a method based on the scalar Preisach model describing local magnetic behaviour of material (the static hysteresis characteristic) and on the pseudo-transient method for integration of the partial differential equation system formulated by finite difference. It enables simulation of dynamic operation demanding experimental data obtained by static measurements only. Numerical results are presented for different frequencies and wave forms of the source field applied at the surface of a ferromagnetic sheet