考虑颗粒属性的软磁复合材料磁特性预测方法  

Prediction of Magnetic Properties of Soft Magnetic Composites with Considering of Particle Properties

作　　者：赵轩哲 张殿海[1] 史凯萌 任自艳[1] 张艳丽[1] Zhao Xuanzhe;Zhang Dianhai;Shi Kaimeng;Ren Ziyan;Zhang Yanli(Key Laboratory of Special Motors and High-voltage Electrical Apparatus Ministry of Education Shenyang University of Technology,Shenyang 110870 China)

机构地区：[1]教育部特种电机与高压电器重点实验室(沈阳工业大学),沈阳110870

出　　处：《电工技术学报》2024年第23期7309-7318,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51707125);辽宁省教育厅科学研究项目(LJKZ0125)资助。

摘　　要：针对目前软磁复合材料(SMC)制造前磁特性预测无法计及颗粒属性和制备参数而导致磁导率和涡流损耗等磁特性评估结果存在偏差的问题,该文提出将离散元(DE)与有限元(FE)相结合的新型SMC材料磁特性预测方法。基于三维DEM研究了颗粒形状、粒径及其分布对SMC样品微观结构的影响,给出DEM模型中最适颗粒参数。为解决所建立的微观尺度SMC材料FE模型求解带来的计算量大的问题,提出一种均质化等效几何模型构建方法。以相对密度为桥梁构建SMC均质化等效FE模型,进而实现对磁导率和涡流损耗的预测评估。最后,利用直流磁化法和环样法分别测量了SMC试样的磁导率和损耗,通过实验与预测结果进行对比分析,验证所提出的磁特性预测方法的可靠性。The development of modern electric equipment towards high quality and differentiation has led to an increase in the demand for the uniqueness of physical parameters of electric materials.Soft magnetic composites(SMC)is a novel type of soft magnetic material with isotropic magnetic properties that is prepared by the powder metallurgy process.In comparison to metal soft magnetic alloys,it exhibits higher resistivity and three-dimensional molding capabilities.In contrast to ferrite materials,it has a higher saturation magnetic induction strength.Consequently,SMC offer a unique combination of high flux density and low loss for electrical equipment,a characteristic that is challenging to achieve with soft magnetic alloys and ferrites.At present,the prediction of magnetic properties of SMC prior to fabrication does not take into account the particle properties,preparation process parameters,and microstructural parameters,which results in biased evaluation results.In order to address these issues,a novel method for predicting the magnetic properties of SMC materials combining the discrete element method(DEM)and the finite element method(FEM)is proposed.This method is of great significance in facilitating the accelerated development of SMC and in optimizing the design of the global structure of electrotechnical equipment.A simulation of the preparation of SMC was conducted using DEM.Firstly,the SMC particle properties-including shape,size,and particle size distribution-were analyzed according to scanning electron microscopy.Secondly,the particle properties were simulated using DEM with spherical(single ball),rectangular(two ball stacked fit),and trigonal(three ball stacked fit)shapes.The particle size distributions were homogeneous,isotropic,and normal.Finally,DEM was used to simulate the SMC preparation process,which involved powder filling and pressure pressing.The magnetic properties of SMC were evaluated using FEM.To address the computational challenges associated with the established FE model of micro-scale SMC,a me

关 键 词：软磁复合材料 颗粒属性 离散元 磁特性 

分 类 号：TM272[一般工业技术—材料科学与工程]