机械应力下无取向电工钢片磁致伸缩特性研究  

Study on Magnetostrictive Properties of Non-Oriented Electrical Steel Sheet under Mechanical Stress

作　　者：王振 张艳丽[1] 龚园 张殿海[1] 谢德馨[1] Wang Zhen;Zhang Yanli;Gong Yuan;Zhang Dianhai;Xie Dexin(School of Electrical Engineering Shenyang University of Technology,Shenyang 110870 China)

机构地区：[1]沈阳工业大学电气工程学院,沈阳110870

出　　处：《电工技术学报》2023年第21期5682-5690,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(52277015)。

摘　　要：电工钢片的磁致伸缩现象是引起电机、变压器铁心产生振动和噪声的主要原因之一。铁心的裁剪、冲压、装配等加工工艺会在电工钢片中产生残余应力,进而改变电工钢片的磁致伸缩特性,加剧铁心的振动噪声。该文基于三轴应变计方法,研制并开发了应力下电工钢片磁致伸缩特性测量系统,测量并分析了不同应力下无取向电工钢片的磁致伸缩应变,讨论电工钢片三种切割方式对磁致伸缩特性的影响,并分析了退火前后磁致伸缩特性的变化,给出三种切割方式产生的残余应力和测量方法。最后基于上述实验测量得到的应力下磁致伸缩数据,对一台永磁电机定子铁心的磁致伸缩效应进行了仿真计算,分析了残余应力对铁心形变的影响。研究表明,压应力会使电工钢片磁致伸缩效应加剧,激光切割方式会产生更大的残余应力使得电机振动增大,该研究为进一步分析铁心的振动噪声提供了科学依据。The magnetostrictive phenomenon of electrical steel sheet is one of the main causes of vibration and noise of motor and transformer core.The processing technology for the cores,such as cutting,stamping,assembly etc.,will produce residual stress in the electrical steel sheet,then changing the magnetostrictive characteristic of electrical steel sheet and increasing vibration and noise of core.The external stress can affect the magnetostriction of non-oriented electrical steel sheet.In this paper,it is shown that the curves of the principal strain of the elongation of the non-oriented electrical steel sheet with the peak values of the magnetic flux density during the change of the applied stress from-8 MPa to 8 MPa are given.Under the same magnetic flux density,compared with the curve without external stress,the applied pressure will increase the magnetostriction,and the external tension will decrease the magnetostriction.From the perspective of microscopic mechanism,when the tensile stress and compressive stress act on the electrical steel sheet,the mechanical stress will change the structure of the magnetic domain,which will affect the magnetization process,and then affect the magnetostriction.The reasons for this influence are also analyzed in this paper.In addition,under the same applied stress,the magnetostriction will increase with the increase of magnetic induction intensity.Different cutting methods will affect the magnetostrictive characteristics of non-oriented electrical steel sheet.In this paper,the magnetostrictive loops are studied under three cutting methods when the samples are magnetized in the rolling direction.It can be seen that the magnetostrictive peak value of laser cutting sample in the same situation is obviously larger than that of hydraulic shearing machine and line cutting method, its peak value of strain is about 2 times that of hydraulic cutting and line cutting method. When the same compressive stress is applied to the samples of the three cutting methods, the magnetostrictive peak val

关 键 词：磁致伸缩 退火 应力 切割方式 

分 类 号：TM275[一般工业技术—材料科学与工程]