Dynamic characteristics of a high‐Tcsuperconducting bearing with a set of alternating‐polarity magnets
作者:
Mochimitsu Komori,
Teruo Matsushita,
Satoru Fukata,
Akira Tsuruta,
Takahiko Ide,
期刊:
Journal of Applied Physics
(AIP Available online 1995)
卷期:
Volume 77,
issue 2
页码: 899-904
ISSN:0021-8979
年代: 1995
DOI:10.1063/1.359016
出版商: AIP
数据来源: AIP
摘要:
Dynamics of a superconducting bearing with a high‐Tcsuperconductor and a set of alternating‐polarity magnets are discussed. The superconductor used is prepared by the quench and melt growth process. The set of magnets levitates over the superconductor which is field cooled in liquid nitrogen. To construct a dynamic model of the superconducting bearing, responses for impulse forces given to the levitating magnets in vertical direction are investigated. Damped free‐vibration curves of the levitating magnets are observed. Dynamic stiffness and viscous damping coefficient can be defined by using the periodical vibration curves. It is also found that the stiffness and the damping coefficient depend on the width of a bar magnet. The resultant energy loss of the superconducting bearing is evaluated by using the force‐displacement relationship and Bean’s critical state model [Phys. Rev. Lett.8, 250 (1962)]. ©1995 American Institute of Physics.
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