Modeling of Magnetic Characteristics of Electrical Steel Sheet under Stress Considering the Thermodynamic Hysteresis and Magnetic Domain Energy

The magnetic characteristics of electrical steel sheet are very important for the optimal design of motors and transformers. The change of magnetic characteristics is essentially due to the change of magnetic domain magnetization state. During the magnetic domain movement and moment rotation, magnetic hysteresis will occur due to the pinning effect in ferromagnetic material. In this paper, the magnetic characteristics of electrical steel sheet under stress is observed by a magneto-optic Kerr microscope and modeled using an improved assembled domain structure model (ADSM). The pinning field caused by the pinning effect is calculated with the eigenvalues extracted from the magnetic domain patterns based on a thermodynamic model.