The force relaxation in levitating high Tc superconductor

E. Ito; Y. Komano; K. Sawa; M. Murakami; N. Sakai; I. Hirabayashi

doi:10.1063/1.2192429

The force relaxation in levitating high Tc superconductor

E. Ito, Y. Komano, K. Sawa, M. Murakami, N. Sakai, I. Hirabayashi

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

In development of a flywheel energy storage system, electric power loss reduction is expected by using superconducting bearings. However, for realization of superconducting bearing strong levitation force, rotation loss reduction and axial descent reduction are required. It is known with axial descent reduction technology that a preload method is effective, whereas by this method, the levitation force becomes quite small compared with the normal levitation. We confirmed the performance of the preload method by experiment using a YBCO superconducting electromagnet. The preload method is improved and a method, which does not change the rate of the force relaxation and makes the levitation force larger than the existing preload method is proposed.

Original language	English
Title of host publication	ADVANCES IN CRYOGENIC ENGINEERING
Subtitle of host publication	Transactions of the International Cryogenic Materials Conference, ICMC, Volume 52B
Pages	820-827
Number of pages	8
DOIs	https://doi.org/10.1063/1.2192429
Publication status	Published - 2006 Mar 31
Event	ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the International Cryogenic Materials Conference, ICMC - Keystone, CO, United States Duration: 2005 Aug 29 → 2005 Sept 2

Publication series

Name	AIP Conference Proceedings
Volume	824 II
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the International Cryogenic Materials Conference, ICMC
Country/Territory	United States
City	Keystone, CO
Period	05/8/29 → 05/9/2

Keywords

Bulk superconductor
Levitation
Shielding current distribution
Y-Ba-Cu-O

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.2192429

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Ito, E, Komano, Y, Sawa, K, Murakami, M, Sakai, N & Hirabayashi, I 2006, The force relaxation in levitating high Tc superconductor. in ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the International Cryogenic Materials Conference, ICMC, Volume 52B. AIP Conference Proceedings, vol. 824 II, pp. 820-827, ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the International Cryogenic Materials Conference, ICMC, Keystone, CO, United States, 05/8/29. https://doi.org/10.1063/1.2192429

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abstract = "In development of a flywheel energy storage system, electric power loss reduction is expected by using superconducting bearings. However, for realization of superconducting bearing strong levitation force, rotation loss reduction and axial descent reduction are required. It is known with axial descent reduction technology that a preload method is effective, whereas by this method, the levitation force becomes quite small compared with the normal levitation. We confirmed the performance of the preload method by experiment using a YBCO superconducting electromagnet. The preload method is improved and a method, which does not change the rate of the force relaxation and makes the levitation force larger than the existing preload method is proposed.",

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author = "E. Ito and Y. Komano and K. Sawa and M. Murakami and N. Sakai and I. Hirabayashi",

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AU - Ito, E.

AU - Komano, Y.

AU - Sawa, K.

AU - Murakami, M.

AU - Sakai, N.

AU - Hirabayashi, I.

PY - 2006/3/31

Y1 - 2006/3/31

N2 - In development of a flywheel energy storage system, electric power loss reduction is expected by using superconducting bearings. However, for realization of superconducting bearing strong levitation force, rotation loss reduction and axial descent reduction are required. It is known with axial descent reduction technology that a preload method is effective, whereas by this method, the levitation force becomes quite small compared with the normal levitation. We confirmed the performance of the preload method by experiment using a YBCO superconducting electromagnet. The preload method is improved and a method, which does not change the rate of the force relaxation and makes the levitation force larger than the existing preload method is proposed.

AB - In development of a flywheel energy storage system, electric power loss reduction is expected by using superconducting bearings. However, for realization of superconducting bearing strong levitation force, rotation loss reduction and axial descent reduction are required. It is known with axial descent reduction technology that a preload method is effective, whereas by this method, the levitation force becomes quite small compared with the normal levitation. We confirmed the performance of the preload method by experiment using a YBCO superconducting electromagnet. The preload method is improved and a method, which does not change the rate of the force relaxation and makes the levitation force larger than the existing preload method is proposed.

KW - Bulk superconductor

KW - Levitation

KW - Shielding current distribution

KW - Y-Ba-Cu-O

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The force relaxation in levitating high Tc superconductor

Abstract

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Conference

Keywords

ASJC Scopus subject areas

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