The purpose of this study is to propose a frequency-domain finite element method (FEM) coupled with a dynamic hysteresis model to improve the simulation accuracy of magnetic fields and iron losses of amorphous transformer cores.
The loss separation theory, the inverse Preisach model and the eddy current equations accounting for the skin effect are applied to generate the dynamic hysteresis model. The fixed-point technique is implemented to improve the nonlinear convergence. A filter method with relaxed reluctivity is proposed to avoid the precision loss of the Fourier transform when integrating hysteresis loops into the frequency-domain FEM.
The simulation results are validated by comparing them to the measurement results of a voltage-driven amorphous transformer under the excitation with a broadband frequency range. Comparison results of the proposed method and the conventional FEM using magnetization curves are discussed in the simulation of loss and exciting currents.
A nonlinear frequency-domain FEM coupled with a dynamic hysteresis model considering the skin effect is proposed and applied on the simulation of amorphous core under a broadband frequency range. The issues and possible solutions when integrating hysteresis model into frequency-domain FEM are discussed in detail.
