Irreversible permeability and DC losses relationship for selected soft magnetic materials

The paper presents the relations for the irreversible permeability at initial magnetization curve, derived and verified for selected soft magnetic materials (FeSi and NiFe steel sheets, compacted and sintered NiFe powder, non-sintered warm compacted Fe powder and Fe-phenolphormaldehyde resin composites). The derivation was based on the Steinmetz law for DC energy losses. Verification of the relations was performed by the comparison of experimental and calculated dependences of the irreversible permeability versus magnetic induction, where the empirical functions in the relations were found. For NiFe steel sheet and all composites the functions were allowed to be taken as constants with a good accuracy. The relations were so proposed for each of the selected soft magnetic materials within the induction ranges covering the ranges of validity of the Steinmetz law.