高温超导永磁体脉冲磁化过程中的电磁行为  

ELECTROMAGNETIC DIFFUSION IN HTS PERMANENT MAGNET DURING PULSED EXCITATION

作　　者：丘明[1] 韩朔[1] 林良真[1] 

机构地区：[1]中国科学院电工研究所

出　　处：《电工电能新技术》1997年第1期6-10,共5页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然科学基金;国家超导技术联合中心资助

摘　　要：本文数值分析了在脉冲场中永磁体内部的电磁扩散过程，结果表明其内部的电磁场分布及其伴随的能耗依赖于α、μ数值的变化，随着脉冲磁场幅值的增加内部的电场、电流和能耗将经历一个极大值后逐渐地减小；恒场时的能耗明显高于相应的变场过程，对体系的温升起了决定作用；在中温、中场区域α１，体系表现出强烈地非线性行为；变场速率的差异对所产生的磁热效应和最终的磁化效果影响较小，而在高温下，一定的变场速率范围内可以采用线性近似粗略地描述ＨＴＳ永磁体的实验现象。In this paper peculiarities of electromagnetic diffusion in HTS permanent magnet with an exponential current voltage characteristic have been studied. The transient process occuring in the magnet placed in a pulsed magnetic field is analysed. It is shown that the internal electromagnetic distribution and dissipation depends strongly on α、μ. The peak effect of voltage and dissipation power happens with increasing magnetic fields. The dissipation in the unchangable field mainly contributes to the rise of the temperature. In the collecting pinning zone one has strong nonlinearity. Conversely, the problem reduces to that of linear response in high temperature and small field zones.

关 键 词：高温超导 永磁体 脉冲磁化 电磁扩散 磁性材料 

分 类 号：TM273.013[一般工业技术—材料科学与工程]