Steinmetz law for ac magnetized iron-phenolformaldehyde resin soft magnetic composites

摘要

The validity of the Steinmetz law, describing the total energy losses as a function of maximum induction from 0.1 to 1.2 T has been verified in the frequency range from 100 Hz to 1.2 kHz for iron-based soft magnetic composites (SMCs), with the aim to determine the coefficients in Steinmetz law. The Bertotti's statistical model was used to modify the Steinmetz law, for the hysteresis energy loss W_(dc) of SMCs magnetized in dc magnetic field, to the model for total energy losses W_t when an ac magnetic field is applied. In this case the total energy losses W_t consist of hysteresis losses to which the dynamic energy losses W_d, consisting of interparticle eddy current losses W_c~(int er), intraparticle eddy current losses W_c~(int ra) and excess losses W_e, were added. The validity of this model was experimentally proven for the investigated Fe-based SMCs at maximum inductions B_m ranging from 0.1 to 1.2 T.