Relationship between Residual Loss and Hysteresis Loss of MnZn Ferrites

抄録

  Reduction of losses of Mn-Zn ferrites is of great importance to develop power supplies reduced in size and weight.For this requirement many attempts to study loss characteristics have been carried out, however, all contributions of each loss factor have not been made clear yet. In this study the eddy current losses are assumed to be expressed as a classical formula, proportional to the cross sectional area of the sample, squares of frequency and magnetic flux density and inversely proportional to AC resistivity. On this assumption the eddy current losses contribute less than 10% of total losses at 100kHz and 200mT. Furthermore the residual losses have proved to be in direct proportion to the hysteresis losses and the ratios of two components depend on frequencies and temperatures of measurement and also on grain size of the core samples.