辅助永磁体磁化方式对单畴GdBCO超导块材捕获磁场分布及其磁悬浮力的影响

马俊; 杨万民; 王妙; 陈森林; 冯忠岭

doi:10.7498/aps.62.227401

摘要

通过对方形永磁体和方形辅助永磁体在液氮温度下对GdBCO超导体磁化后超导磁悬浮力的测量, 研究了两种组态中方形辅助永磁体对超导体的磁化方式对单畴GdBCO超导块材磁场分布及其磁悬浮力的影响. 结果发现, 方形辅助永磁体的下表面和超导体上表面保持在同一个水平面上, 磁化进程中方形辅助永磁体在GdBCO超导体上表面水平面内沿直径方向的位置x从–15 mm增加到+15 mm时, 超导磁悬浮力大小与超导体的磁化方式有着密切关系(以Z=0.1 mm为例): 1) 当方形辅助永磁体N极垂直向上且场冷后去掉辅助永磁体时, 超导体最大磁悬浮力先从16.7 N增大到23.1 N, 再减小到16.6 N; 2) 当方形辅助永磁体N极垂直向下且场冷后去掉辅助永磁体时, 超导体最大磁悬浮力先从17.7 N减小到7 N, 再增加到17.6 N; 3) 两种组态中最大磁悬浮力不相等, 而且与零场冷下的最大磁悬浮力(17.1 N)也不同. 这些结果说明: 只有通过科学合理地设计超导体和永磁体的组合方式, 才能获得较高的磁场强度, 有效地提高超导体的磁悬浮力特性, 该结果对促进超导体的应用具有重要的指导意义.

关键词:

Abstract

It has been investigated that the interaction force between a cubic permanent magnet PM1 and a GdBCO bulk (HTSC) superconducting permanent magnet (SCPM) magnetized by a cubic permanent magnet PM2 under different configurations at 77 K. Two configurations were used for the magnetization of the GdBCO bulk, one is that the North pole of the PM2 is in upward direction, the other is in downward direction, so that the North pole of the SCPM is in two states SCPM↑ and SCPM↓; the vertical distance between the bottom surface of PM1 and the top surface of SCPM is kept as a constant value, but the PM2 can be fixed at any positions (x) along a diameter of the GdBCO bulk during the magnetization process. It is found that: for the PM1↓-SCPM↑ configuration, the maximum levitation force is increasing from 16.7 N to 23.1 N when x increases from –15 mm to 0, and then decreases to 16.6 N when x further increases to 15 mm; but for the PM1↓-SCPM↓ configuration, the maximum levitation force is decreasing from 17.7 N to 7 N when x increases from –15 mm to 0, and then increases to 17.6 N when x further increases to 15 mm. These results are not only much different in the two configurations, but also much different from the maximum levitation force 17.1 N of the sample under zero field cooled condition, which is closely related with the trapped field distribution of the SCPM at different x values. These results indicate that the levitation force of high temperature bulk superconductors can be effectively improved by introducing additional permanent magnet based on scientific and reasonable designing of the system configurations, which is very important during the practical design and applications of superconducting magnetic levitation systems.

Keywords:

作者及机构信息

1.
青海师范大学物理系, 西宁 810008;

2.
陕西师范大学物理学与信息技术学院, 西安 710062

基金项目: 国家自然科学基金(批准号: 51167016, 50872079)、教育部科学技术研究重大项目(批准号: 311033)和中央高校基本科研业务费专项资金(批准号: GK201101001, GK201305014)资助的课题.

Authors and contacts

1.
Department of Physics Qinghai Normal University, Xining 810008, China;

2.
College of Physics and Information Technology, Shaanxi Normal University, Xi’an 710062, China

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 51167016, 50872079), the Key Grant Project of Chinese Ministry of Education (Grant No. 311033), and the Fundamental Research Funds for the Central Universities, China (Grant Nos. GK201101001, GK201305014).

参考文献

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[25]	Zhang X Y, Zhou J, Zhou Y H 2009 Supercond. Sci. Technol. 22 1
[26]	Deng Z, Zheng J, Song H 2007 IEEE Trans. Appl. Supercond. 17 2071
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[30]	Yang W M, Chao X X, Shu Z B 2006 Physica C 445–448 347

施引文献

[1]	John R H, Shaul H, Tomotake M 2005 Supercond. Sci. Technol. 18 S1
[2]	Werfel F N, Floegel-Delor U, Rothfeld R 2005 Supercond. Sci. Technol. 18 S19
[3]	Koshizuka N 2006 Physica C 1103 445
[4]	Miyagawa Y, Kameno H, Takahata R 1999 IEEE. Trans. Appl. Supercond. 9 996
[5]	Nuria D V, Alvaro S, Carles N 2008 Appl. Phys. Lett. 92 042505
[6]	Wang J S, Wang S Y 2002 Physica C 378–381 809
[7]	Ewoud V W, Yamamoto A, Toshiro H 2009 Precision Engineer. 33 217
[8]	Yang W M, Zhou L, Feng Y, Zhang P X, Zhang C P 2002 Cryogenics 42 589
[9]	Koblischka A V, Mcklich F, Koblischka M R 2002 Cryst. Engineer. 5 411
[10]	Chan W C 2003 Physica C: Superconductivity 390 27
[11]	Zhu M, Ren Z Y, Wang S Y 2002 Chin. J. Low Temperature Phys. 24 213 (in Chinese) [朱敏, 任仲友, 王素玉 2002 低温 24 213]
[12]	He G L, He Y W, Zhao Z G, Liu M 2006 Acta Phys. Sin. 55 839 (in Chinese) 55 839 [何国良, 贺延文, 赵志刚, 刘楣 2006 55 839]
[13]	Zhou J, Zhang X Y, Zhou Y H 2009 Physica C: Superconductivity 469 207
[14]	Cheng T L, Shih C L 2006 J. Magnet. Magnet. Mater. 304 454
[15]	Zhang F Y, Huang S L, Cao X W 1989 Acta Phys. Sin. 38 830 (in Chinese) [张凤英, 黄孙利, 曹效文 1989 38 830]
[16]	Nuria D V, Alvaro S, Enric P 2007 Appl. Phys. Lett. 90 042503
[17]	Wang F, Sun G Q, Kong X M 2001 Acta Phys. Sin. 50 1590 (in Chinese) [王峰, 孙国庆, 孔祥木 2001 50 1590]
[18]	Yang W M, Chao X X, Ma J, Li G Z 2010 J. Supercond. Nov. Magn. 23 1007
[19]	Wang M, Yang W M, Ma J, Tang Y N 2012 Sci. Sin. Phys. Mech. Astron. 42 346 (in Chinese) [王妙, 杨万民, 马俊, 唐艳妮 2012 中国科学: 物理学, 力学, 天文学 42 346]
[20]	Wang M, Yang W M, Zhang X J, Tang Y N 2012 Acta Phys. Sin. 61 196102 (in Chinese) [王妙, 杨万民, 张晓菊, 唐艳妮 2012 61 196102]
[21]	Ma J, Yang W M, Li G Z 2011 Acta Phys. Sin. 60 027401 (in Chinese) [马俊, 杨万民, 李国政 2011 60 027401]
[22]	Ma J, Yang W M 2011 Acta Phys. Sin. 60 077401 (in Chinese) [马俊, 杨万民 2011 60 077401]
[23]	Ma J, Yang W M, Li J W 2012 Acta Phys. Sin. 61 137401 (in Chinese) [马俊, 杨万民, 李佳伟 2012 61 137401]
[24]	Yang W M, Zhou L, Feng Y, Zhang P X 2003 Physica C: Superconductivity 398 141
[25]	Zhang X Y, Zhou J, Zhou Y H 2009 Supercond. Sci. Technol. 22 1
[26]	Deng Z, Zheng J, Song H 2007 IEEE Trans. Appl. Supercond. 17 2071
[27]	He Q Y, Wang J S, Wang S Y 2009 Physica C 469 91
[28]	Tsuda M, Kawasaki T, Yagai T 2008 J. Phys. 97 1
[29]	Cheng X F, Yang W M, Li G Z 2010 Chin. J. Low Temperature Phys. 32 150 (in Chinese) [程晓芳, 杨万民, 李国政 2010 低温 32 150]
[30]	Yang W M, Chao X X, Shu Z B 2006 Physica C 445–448 347

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