LOW-FRICTION IN MIXED-MU SUPERCONDUCTING BEARINGS

Authors
HULL JR HILTON EF MULCAHY TM YANG ZJ LOCKWOOD A STRASIK M
Citation
Jr. Hull et al., LOW-FRICTION IN MIXED-MU SUPERCONDUCTING BEARINGS, Journal of applied physics, 78(11), 1995, pp. 6833-6838
Citations number
15
Categorie Soggetti
Physics, Applied
Journal title
Journal of applied physics → ACNP
ISSN journal
00218979
Volume
78
Issue
11
Year of publication
1995
Pages
6833 - 6838
Database
ISI
SICI code
0021-8979(1995)78:11<6833:LIMSB>2.0.ZU;2-S
Abstract
Individual magnetic steel rotors were levitated by combining the attra ctive force between permanent magnets and the steel with the repulsive force between high-temperature superconductors and the steel. The fre e spindown of several rotors was observed, and the effective coefficie nt of friction for the bearing was calculated as a function of geometr y. Low-speed coefficients of <10(-8) were observed, and the velocity d ependence of MnZn ferrite rotors suggest that coefficients of <10(-6) are attainable at bearing rim velocities of 100 m/s.