预载条件下Y-Ba-Cu-O块材的悬浮力弛豫特性  

Relaxation characteristic of the levitation force of bulk Y-Ba-Cu-O with pre-loading applied

作　　者：王金钗[1,2] 蒋国强[1,2] 许媛媛[1,2] 王楠[1,2] 马光同[1,3] 刘伟[1] 蒋冬辉[1] 林群煦[1] 

机构地区：[1]西南交通大学超导技术研究所,成都610031 [2]西南交通大学电气工程学院,成都610031 [3]西南交通大学牵引动力国家重点实验室,成都610031

出　　处：《低温与超导》2011年第7期47-52,共6页Cryogenics and Superconductivity

基　　金：西南交通大学大学生科研训练计划(100320);西南交通大学博士研究生创新基金和国家自然科学基金(51007076)资助

摘　　要：文中以实验技术为手段,研究了不同工况下预载抑制悬浮力弛豫衰减的作用规律。实验以Halbach永磁轨道和三籽晶方形Y-Ba-Cu-O块材组成的系统为主要研究对象,通过改变块材的场冷方式、工作高度、预载高度等,研究这些因素对块材悬浮力弛豫的影响规律。选取30mm场冷高度、15mm工作高度,改变永磁轨道和块材,研究了轨道磁场分布和材料性能对预载条件下悬浮力弛豫行为的影响规律。研究结果表明,不论工况如何,预载后悬浮力的弛豫衰减均被抑制,并且预载高度越低,悬浮力随时间增长越明显,但另一方面,经过预载后悬浮力均出现了不同程度的下降。Using the experimental apparatus, we studied the influencing law of the pre -loading in reducing the levitation force decay during the relaxation. The main research object consisted of a three - seed rectangular Y - Ba - Cu - O bulk above a magnetic rail derived from Halbaeh structure, and the influencing law of cooling condition, levitation height and pre - loading height was investigated by changing those factors. We further selected the 30 mm field - cooling height and 15 mm levitation height as a typical case, and studied the influence of magnetic field distribution and material property on the levitation force relaxation under the pre - loading in that typical case by changing the magnetic rail and Y - Ba - Cu - O bulk. We found that, after the pre- loading, the levitation force decay during therelaxation was totally suppressed in every working condition considered. And moreover, the time evolution of the levitation force displayed an obvious rise especially for a low pre -loading position. However, the levitation force that Y - Ba - Cu - O bulk could provide was also reduced in varying degrees according to the pre - loading position.

关 键 词：Y—Ba—Cu-O块材 悬浮力 弛豫 预载 永磁轨道 

分 类 号：O521.21[理学—高压高温物理]