A general model of losses in soft magnetic materials

Abstract A general magnetic loss model is presented which takes account with proper approximations of the spatial and temporal non-homogeneities and stochastic character of the elementary dissipative mechanisms. An expression is obtained in which dynamic losses in a lamination of thickness d are linked to the energy spectrum of the emf measured between two points on the sample surface at a distance d. A good fit is found between calculated and measured losses between about 1 and 100 Hz in G.O. SiFe, and it is shown that, from the obtained link, one can interpret the excess and non-linearity loss anomalies in terms of the stochastic characteristics of the magnetization processes and of their homogeneization with increasing magnetizing frequency.