Dynamic Observation of Magnetic Domains and Modeling of Hysteresis Characteristics of Electrical Steel Under Coupling Effect of Magnetic Field and Stress
Magnetic materials such as electrical steel are key materials that constitute the magnetic circuits of electrical equipment such as power transformers and medium-and high-frequency transformers.Their hysteresis characteristics de-termine equipment losses.The essence of hysteresis characteristics is reflected in the movement of magnetic domain walls and the flipping of magnetic domains inside materials during the magnetization process,and the introduction of external stress will change the magnetic domain structure of electrical steel.This paper aimed to model the hysteresis characteris-tics of grain-oriented silicon steel sheet under the coupling effect of magnetic field and stress.A stress magneto-optical Kerr microscope was used to observe the dynamic magnetization rules of magnetic domains under the influence of stress,revealing the dynamic evolution mechanism of magnetic domains within electrical steel.On this basis,the image pro-cessing technology was used to obtain displacement,velocity,acceleration and other characteristic quantities of domain walls movement under external coupling.Based on the theoretical basis of magnetic domain energy minimization,the domain walls movement acceleration was used as the characteristic quantity to construct a representation model,and the hysteresis characteristic of electrical steel was modeled.The effectiveness of this model was verified by comparison with measured data.The research results are adopted to establish the mapping relationship between the magnetic domains magnetization characteristic quantity and the macroscopic hysteresis characteristics of the material,providing a certain theoretical support for the research on the modification of magnetic materials.
electrical steelstressmagnetic domain evolutionenergy minimizationhysteresis model
万方数据
维普
