Energy Loss in Soft Magnetic Materials under Harmonic Excitation and High Induction

In order to achieve accurate prediction of soft magnetic material loss in a wide range of frequencies and flux densities, this paper proposes a calculation method based on the loss separation model that can take into account the skin effect of soft magnetic materials and accurately simulate the material losses under harmonic excitation conditions. First, a nonlinear Preisach model is used to calculate the hysteresis loss by fitting the first-order and the second-order slew curve simultaneously. Then, under low flux density and high frequency, the classical loss is obtained by approximating the material's intrinsic structure relationship as linear; under high flux density and high frequency, the fixed-point finite element technique based on the H-B-M magnetic intrinsic structure relationship is introduced into the harmonic finite element calculation to calculate the classical loss under high flux density. Finally, energy loss in the frequency range of 1 kHz and under different harmonic excitation conditions are calculated. It shows that the method in this paper are in good agreement with experimental measurement results, which verifies the accuracy of the method.