旋转超导铌球在磁场中的力矩分析  

Analysis of Torque Acting on the Superconducting Spinning Sphere in the Magnetic Field

作　　者：崔春艳[1,2,3] 王秋良[1,2] 胡新宁[1,2] 赵尚武[1,2,3] 

机构地区：[1]中国科学院应用超导重点实验室,北京100080 [2]中国科学院电工研究所,北京100080 [3]中国科学院研究生院,北京100039

出　　处：《稀有金属材料与工程》2008年第A04期56-59,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(10055001/A050210;50577063)

摘　　要：由金属铌制成的超导球体,利用超导体的迈斯纳效应悬浮在球腔中,在外磁场的影响下会有少量俘获磁通存在,本文引入球谐函数计算磁场,分析了俘获磁通和外磁场相互作用后对超导转子产生的干扰力矩。在磁场中旋转的超导球体也会产生一个与转速成比例的伦敦磁场,与外部磁场相互作用从而产生干扰力矩作用于超导球。本文从旋转超导球体的电磁特性和磁场分布入手,计算和分析了伦敦磁矩对旋转超导球体的干扰力矩及对超导球体运动的影响。Based on the Meissner effect, the superconducting sphere made of niobium is suspended in the spherical housing. Under the influence of external magnetic field, the flux is trapped in the sphere. In this paper we calculate and express the trapped magnetic field in terms of spherical harmonic function, and analyze the disturbing torque generated from the interaction between trapped magnetic field and external field. Meanwhile, the London magnetic dipole moment proportional to spin speed is also generated in the superconducting sphere. Considering the interaction of London moment and applied magnetic field, we calculate and analyze the torque based on the electromagnetic properties and field distribution.

关 键 词：伦敦磁矩 力矩 超导球体 俘获磁通 球谐函数 

分 类 号：O511[理学—低温物理]