Power losses calculation in modern solid ferromagnetics throughout the implicit iterative method within 3D fields analysis

Abstract

The prediction and measurement verification of power losses in modern solid ferromagnetic cores operating at medium frequency has been described. The cores are made of nanostructures. After three-dimensional field analysis in the above-mentioned cores, the integral parameters of the field were determined. They differ from the catalog ones. Manufacturers do not provide the values of electrical conductivity and magnetic permeability in a wide range of the flux density values and operating frequencies. Particularly, this applies the electrical conductivities of the solid core, which are necessary for correct determination of eddy current losses. The original implicit iterative algorithm for calculation of the conductivity values under given operating frequencies was developed and presented. The calculated magnetic core losses have been tested for such solid materials as the magnetically soft composite (SMC) called Somaloy and for a ferrite. Good compliance of the calculated hysteresis losses and the eddy current ones with the measured values was obtained.