FREQUENCY MAGNETIC-BEHAVIOR OF SIFE SHEETS IN A ROTATIONAL FIELD

The frequency dependence of losses and the magnetic field has been inv estigated for different kinds of sheets at 1 T, circular B and in the range 10-400 Hz. The loss behaviour is discussed according to the rota tional loss prediction developed by Fiorillo and Bertotti. As the freq uency increases, the locus H-y(H-x) rotates exhibiting an increasing a rea. Analysis of the H modulus and phase shows the anisotropy and hyst eresis effects. For thick samples, the contribution of the eddy curren t is considerable. A homogenization effect is observed which leads to isotropic behaviour.