高温超导块脉冲磁化实验研究与理论模拟  

EXPERIMENTAL AND THEORETIC RESEARCH ON PULSE FIELD MAGNETIZATION OF HTS BULK

作　　者：霍海宽[1] 丘明[1] 夏东[1] 徐哲[1] 林良真[1] 

机构地区：[1]中科院电工研究所,北京100080

出　　处：《低温物理学报》2004年第4期288-294,共7页Low Temperature Physical Letters

基　　金：国家自然科学基金 (No .5 0 10 70 10 )资助项目

摘　　要：通过磁化熔融织构超导块材俘获远高于常规永磁体的磁场 ,可以用于磁分离、制作电机等 ,如何磁化是其中关键技术问题之一 .脉冲磁化目前被认为是最有前景的超导块材的磁化方式之一 .我们通过霍尔元件测量脉冲磁化过程中超导块材表面磁场的变化 ,并运用磁通蠕动流动模型和幂指数模型分别描述脉冲磁化过程 ,理论与实验相比较 ,结果表明磁通蠕动流动模型能够更好地描述脉冲磁化 ,热量的产生、局域的温升直接关系到俘获磁场的大小 。The trapped field of HTS bulk is higher than that of the conventional magnetic material at low temperature, so we can use this bulk to design the electrical motor. In practice the magnetization of HTS bulk is the key problem and the pulse field magnetization is considered to be one of the most useful methods. The magnetization process is simulated by using the flux flow-creep model and power law model, respectively. The experiment is also carried out to measure the magnetic field through three Hall sensors mounted in the surface of HTS bulk. It seems that the flux flow-creep model is better than power law model in describing the pulsed field magnetization. Through further analysis we get that the use of ferrite yoke and multi-pulse technical can improve the result of pulse magnetization.

关 键 词：磁通蠕动 高温超导 磁化 铁轭 熔融织构 永磁体 温升 俘获 磁场 脉冲 

分 类 号：O511[理学—低温物理]