Application of Jiles-Atherton model in description of temperature characteristics of magnetic core.

Abstract

The Jiles-Atherton (J-A) model is widely used in magnetic characteristic modeling in alternating field. A dynamic J-A model, which is applied under high-frequency condition, is established. A pointwise iterative calculation method is used, and an approximate calculation method of the anhysteretic magnetization intensity and its derivative is proposed. The solving procedure of the J-A model is optimized. The platform for the magnetization and temperature characteristic test is designed and constructed. The hysteresis curves of ferrite cores at different temperatures are measured. The variation of parameters of magnetic properties with temperature is analyzed, including maximum magnetic flux density, remanence, coercivity, and core loss. Based on the particle swarm optimization combined with natural selection, optimized parameters of the J-A model are obtained. Their variation is analyzed, and their fitted curves with temperature are obtained. It is found that J-A model's modification in temperature can be used to guide the modeling analysis of electrical equipment containing magnetic cores working in high-temperature environment and to predict magnetic properties at high temperatures.