Basic magnetization curve fitting function based on spectral analysis

The current fitting function of the basic magnetization curve does not provide the exact fit necessary for the simulation modeling of electromechanical devices containing conductive materials, including polymers. Therefore, an odd polynomial fitting function based on the spectral analysis of the fitting results of the basic magnetization curve under sinusoidal excitation is proposed, and the effect of the odd polynomial fitting is studied by comparative analysis. The results show that the odd polynomial provides a better fit and has a simple expression, and the method of obtaining the fitting function based on the spectral analysis provides a new idea for the selection of the basic magnetization curve fitting function.