Vector Hysteresis Modeling of Soft Magnetic Composite by the Improved Preisach Model Considering Anisotropic Characteristic.

Abstract

Two dimensional (2-D) magnetic flux exist in rotating electric machines and T-joints of three-phase power transformers and may cause local overheating in these devices. The soft magnetic materials, such as electrical steel sheet and soft magnetic composite (SMC), are usually used in the fabrication process of ferromagnetic core. Therefore, it has been focus of attentions to measure and model 2-D magnetic properties of soft magnetic materials in recent years [1], [2]. Compared with the Stoner-Wohlfarth hysteresis model, the Preisach model has the advantage over parameter identification and numerical implementation, and it has been widely used in modeling 2-D vector hysteretic characteristics. Due to the defects of classical vector Preisach model, simulation cannot agree well with measurement, therefore it is necessary to improve the classical vector model. In this paper, by introducing the function $z$, the classical Preisach model is improved to model the 2-D vector hysteresis of SMC considering the influence of anisotropy, the simulated results by the improved model is coincided with the measured ones. The proposed method is meaningful for exploring the rotating magnetic and loss characteristics of electric motor and power transformer.