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Stability Analyses of Magnetic Levitation Tables Using Repulsions of Permanent Magnets  

Choe, Gi-Bong (한국기계연구원 지능형정밀기계연구부 로봇제어그룹)
Jo, Yeong-Geun (미래산업주식회사 미래연구센터)
Tadahiko Shinshi (동경공업대학(일본) 정밀공학연구소)
Akira Shimokohbe (동경공업대학(일본) 정밀공학연구소)
Publication Information
Journal of the Korean Society for Precision Engineering / v.19, no.7, 2002 , pp. 36-42 More about this Journal
Abstract
This paper presents two actuators for levitation using repulsions of permanent magnet and two magnetic levitation tables using the actuators. Here, one actuator for levitation consists of one fixed magnet and one moving magnet, and the other actuator consists of two fixed magnets and one moving magnet. The moving part of the magnetic levitation table contains the moving magnets. repulsive forces caused by the permanent magnets are linearized, and then the equation of motion of the moving part of the table is derived. Using the equation of motion, stability conditions of the moving part are deduced. The stability conditions are analyzed for positional relations of the moving magnets and the minimum number of active control required for stable system. As a result, in the each case of magnetic levitation tables, the requirements for stabilization are expressed by the positional relations and the number of the active controls.
Keywords
Permanent magnet; Repulsion; Virtual spring; Magnetic levitation; Stability condition;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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