摘要
电工钢等磁性材料是构成电力变压器、中高频变压器等电气设备磁路的关键材料,其磁滞特性决定着设备损耗,磁滞特性的本质体现为磁化过程中电工钢内部磁畴畴壁的移动和磁畴的翻转,而外应力的引入会改变电工钢磁畴结构。该文针对磁场和应力耦合作用下取向电工钢磁滞特性的模拟问题,借助应力磁光克尔显微镜观测了应力影响下磁畴动态磁化规律,揭示电工钢内部磁畴动态演变机理。在此基础上,利用图像处理技术获取了耦合外作用下畴壁移动的位移、速度以及加速度等特征量,并以磁畴能量最小化为理论基础,以畴壁移动加速度作为特征量构建表征模型用以模拟电工钢的磁滞特性。结果表明:提取的特征量可直观地了解电工钢内部磁畴在不同应力下的演变过程,基于畴壁移动加速度特征量的磁滞模型能够有效描述电工钢在不同应力下的磁滞特性。研究成果建立了磁畴磁化特征量与材料宏观磁滞特性的映射关系,为磁性材料改性研究提供一定理论支撑。
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 determine 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 characteristics 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 processing 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.
作者
张艳丽
吴鑫
邱发生
王英
王振
张殿海
ZHANG Yanli;WU Xin;QIU Fasheng;WANG Ying;WANG Zhen;ZHANG Dianhai(Key Laboratory of Special Motors and High-voltage Electrical Apparatus,Ministry of Education,Shenyang University of Technology,Shenyang 110870,China;Key Laboratory of Nondestructive Testing,Ministry of Education,Nanchang Hangkong University,Nanchang 330036,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2024年第10期4429-4439,共11页
High Voltage Engineering
基金
国家自然科学基金(52277015)
江西省自然科学基金青年基金(20224BAB214057)。
关键词
电工钢
应力
磁畴演变
能量最小化
磁滞模型
electrical steel
stress
magnetic domain evolution
energy minimization
hysteresis model
