Controlled levitation of bulk superconductors

被引：19

作者：

Nagashima, K ^{[1
]}

Iwasa, Y

Sawa, K

Murakami, M

机构：

[1] Railway Tech Res Inst, Tokyo 1858540, Japan

[2] MIT, Francis Bitter Magnet Lab, Cambridge, MA 02193 USA

[3] Keio Univ, Dept Elect Engn, Kohoku Ku, Yokohama, Kanagawa 2238522, Japan

[4] Superconduct Res Lab, Minato Ku, Tokyo 1050023, Japan

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2000年 / 10卷 / 03期

关键词：

Bi-Sr-Ca-Cu-O electromagnet; magnetic energy; magnetic levitation; Y-Ba-Cu-O bulk;

D O I：

10.1109/77.892145

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 [电气工程]; 0809 [电子科学与技术];

摘要：

Levitation of bulk Y-Ba-Cu-O superconductors could successfully be controlled using a Bi-Sr-Ca-Cu-O superconducting electromagnet. It was found that stable Levitation without tilting was obtained only when the sample trapped a certain amount of field, the minimum of which depended on the external field and the sample dimensions. We also employed the novel analysis method for levitation based on the total energy balance, which is much simpler than the force method and could be applied to the understanding of general levitation behavior. Numerical analyzes thus developed suggested that stable levitation of superconductors with large dimensions can only be achieved when the induced currents can flow with three dimensional freedom.

引用

页码：1642 / 1648

页数：7

共 12 条

[1]

Earnshaw S., 1842, Transactions of the Cambridge Philosophical Society, V7, P97

[2]

Cryotank with superconducting, magnetic suspension of the interior tank [J].

Gauss, S ;

Albering, JH ;

Bock, J ;

Kesten, M ;

Fieseler, H ;

Canders, WR ;

May, H ;

Freyhardt, HC ;

Ullrich, M .

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 1999, 9 (02) :1004-1007

[3]

HULL J, 1997, IEEE SPECTRUM JUL, P20

[4]

'Electromaglev'-magnetic levitation of a superconducting disc with a DC field generated by electromagnets: Part 1. Theoretical and experimental results on operating modes, lift-to-weight ratio, and suspension stiffness [J].

Iwasa, Y ;

Lee, HG .

CRYOGENICS, 1997, 37 (12) :807-816

[5]

IWASA Y, 1998, ISTEC MRS, P125

[6]

Ma K. B., 1992, Proceedings of the 1992 TCSUH Workshop HTS Materials, Bulk Processing, Bulk Applications, P425

[7]

CONSTRUCTION AND PERFORMANCE-TEST OF A MAGNETICALLY LEVITATED TRANSPORT-SYSTEM IN VACUUM USING HIGH-T-C SUPERCONDUCTORS [J].

MINAMI, H ;

YUYAMA, J .

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 1995, 34 (01) :346-349

[8]

Moon F. C., 1994, Superconducting Levitation-Applications to Bearing and Magnetic Transportation

[9]

Murakami M, 1991, MELT PROCESSED HIGH

[10]

NAGASHIMA K, 1999, ADV SUPERCONDUCTIVIT, V11, P1011

← 1 2 →