Suspension of soft magnetic materials using high Tc superconductors

This paper describes a novel suspension technique using high Tc superconductors and magnetic materials. It was found for a field‐cooled superconductor and an adjacent magnetic material that the usual inverse relationship between the attractive magnetic force and gap distance reverts to a direct rela...

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Bibliographic Details
Published inElectrical engineering in Japan Vol. 116; no. 3; pp. 116 - 123
Main Authors Tsutsui, Yukio, Higuchi, Toshiro
Format Journal Article
LanguageEnglish
Published New York Wiley Subscription Services, Inc., A Wiley Company 1996
John Wiley & Sons
Subjects
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
gathering
High Tc superconductor
Magnetic properties
magnetic suspension
permanent magnet
Physics
pinning
Properties of type I and type II superconductors
restoring force
soft magnetic material
Superconductivity
Energy gap
Soft material
High-Tc superconductors
Theoretical study
Magnetic force
Permanent magnets
Magnetic suspension
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ISSN0424-7760
1520-6416
DOI10.1002/eej.4391160311

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Summary:This paper describes a novel suspension technique using high Tc superconductors and magnetic materials. It was found for a field‐cooled superconductor and an adjacent magnetic material that the usual inverse relationship between the attractive magnetic force and gap distance reverts to a direct relationship for small gap length. Thus, stable, noncontact suspension is possible within a certain gap range. This phenomenon was found for even a soft magnetic material possessing minimal coercive force. Since remarkable reversals were observed for magnetic materials with diameters much smaller than that of the pinned area, it is considered that some of the pinned flux is subject to a gathering effect in the magnetic material. Stable, contactless suspension of a 180 g carbon steel weight under a high Tc superconductor was achieved using this technique.
Bibliography:ark:/67375/WNG-0ZGXDXV6-0
ArticleID:EEJ4391160311
istex:06F31493CC2A15F55AF6802AE4B566EFA77B5F3C
M.E. degree in Electrical Engineering from Saga University in March 1990. From 1990 to 1992, he was with the Research Institute of Yasukawa Electric Corporation. Since April 1992, he has been with Kanagawa Academy of Science and Technology. He is currently engaged in magnetic suspension with high temperature superconductors. He is a member of the Cryogenic Engineering Society of Japan.
Ph.D. degree from the University of Tokyo in 1977. He was a Lecturer at the Institute of Industrial Science of the University of Tokyo in 1977 and an Associate Professor in 1978. He is currently a Professor in the Department of Precision Machinery Engineering, Faculty of Engineering, University of Tokyo. Since March 1992, Professor Higuchi has been a leader of “Ultimate Mechanotronics” project of Kanagawa Academy of Science and Technology. He has been engaged in research on mechanotronics. He is a member of the IEEE.
ISSN:0424-7760
1520-6416
DOI:10.1002/eej.4391160311