Rotational decay torques of superconducting magnetic bearing

A superconducting magnetic bearing is proposed as one of the applications of a high-critical-temperature (T/sub c/) oxide superconducting material. New models of bearings with a free rotation axis were assembled. In these models, the superconductor, YBa/sub 2/Cu/sub 3/O/sub x/, prepared by the quenc...

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Bibliographic Details
Published in:IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) 1991-03, Vol.27 (2), p.2423-2426
Main Authors: Takahata, R., Yotsuya, T.
Format: Article
Language:English
Subjects:
360204 > Ceramics, Cermets, & Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
Applied sciences
Assembly
BARIUM COMPOUNDS
BARIUM OXIDES
BEARINGS
CHALCOGENIDES
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER COMPOUNDS
COPPER OXIDES
Damping
Electrical engineering. Electrical power engineering
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
Exact sciences and technology
Flux pinning
MAGNETIC BEARINGS
MAGNETIC FLUX
Magnetic forces
Magnetic levitation
MAGNETIC PROPERTIES
MAGNETS
MATERIALS SCIENCE
MATERIALS TESTING
MELTING
Nitrogen
OXIDES
OXYGEN COMPOUNDS
PERMANENT MAGNETS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
QUENCHING
SUPERCONDUCTING DEVICES
SUPERCONDUCTING MAGNETS
Superconducting materials
TESTING
TRANSITION ELEMENT COMPOUNDS
Various equipment and components
YTTRIUM COMPOUNDS 665412 > Superconducting Devices-- (1992-)
YTTRIUM OXIDES
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Summary:A superconducting magnetic bearing is proposed as one of the applications of a high-critical-temperature (T/sub c/) oxide superconducting material. New models of bearings with a free rotation axis were assembled. In these models, the superconductor, YBa/sub 2/Cu/sub 3/O/sub x/, prepared by the quench and melt growth (QMG) method, was applied to the bearing section and a permanent magnet was used for a rotor. This development originated from the knowledge that YBa/sub 2/Cu/sub 3/O/sub x/ prepared by the QMG method has a stronger pinning force for magnetic flux than that of conventional superconductors. A study of the forces and the damping for magnet rotation above the QMG superconductor was also made. It showed that levitation force and lateral force due to flux pinning were extremely large and damping for magnet rotation was small.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.133707