Rotational decay torques of superconducting magnetic bearing

Author

Takahata, Ryoichi ; Yotsuya, Tsutom

Author_Institution

Koyo Seiko Co. Ltd., Osaka, Japan

Volume

27

Issue

2

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

2423

Lastpage

2426

Abstract

A superconducting magnetic bearing is proposed as one of the applications of a high-critical-temperature (T_c) oxide superconducting material. New models of bearings with a free rotation axis were assembled. In these models, the superconductor, YBa ₂Cu₃O_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 YBa₂Cu₃O_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

Keywords

barium compounds; flux pinning; high-temperature superconductors; magnetic levitation; superconducting devices; yttrium compounds; QMG method; YBa₂Cu₃O_x; damping; flux pinning; free rotation axis; high temperature superconductors; high-critical-temperature; lateral force; levitation force; magnetic flux; models; oxide superconducting material; permanent magnet; pinning force; quench/melt growth method; rotational decay torques; rotor; superconducting magnetic bearing; Assembly; Damping; Flux pinning; Magnetic flux; Magnetic forces; Magnetic levitation; Nitrogen; Permanent magnets; Superconducting magnets; Superconducting materials;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.133707

Filename

133707