高温超导永磁体在交变电磁场中的响应  

THE RESPONES TO LOW AC MAGNETIC FIELDS FORHIGH-Tc SUPERCONDUCTING PERMANENT MAGNETS

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：《低温物理学报》1997年第2期134-141,共8页Low Temperature Physical Letters

基　　金：国家自然科学基金;国家超导技术联合中心资助

摘　　要：高温超导永磁体在交变电磁场中的响应丘明，韩朔，林良真中国科学院电工研究所，北京１０００８０１９９６年６月１３日收到本文测试了４．２Ｋ～７７．３Ｋ温区高温超导永磁体在不同频率的低幅值交变场作用下表面中心钉扎场的变化，并基于所建立感应电路模型，从宏观的角...ln this paper the changes of trapped fields was measured from 4. 2K to 77. 3K when high-Tc superconducting permanent magnets were subject to low AC fields with various frequencies. lt was shown that the decrease in trapped fields depends on the thermomagnetic stability of permanent magnets and the magni- tude of flux-flow resistivity. At low frequencies , the steady decrease in trapped fields is propational to the frequency. Comparatively , the complex function rela- tion between the energy dissipatiOn and the frequency exists at high frequencies . and the redistribution of shield currents inside is affccted seriousely by the demag- ntetic-field effect and the skin effect. Meanwhile . some relevant problems were discussed based on the inductive circuit model.

关 键 词：高TC 超导永磁体 电磁场响应 

分 类 号：TM265[一般工业技术—材料科学与工程]