Self-sensing magnetic levitation using a LC resonant circuit

A self-sensing magnetic levitation system utilizing a LC resonant circuit is proposed by using the characteristic that the inductance of the magnetic system is varied with respect to the air gap displacement. An external capacitor is added into the electric system to make the levitation system stati...

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Bibliographic Details
Published in:Sensors and actuators. A. Physical. 1999, Vol.72 (2), p.169-177
Main Authors: Choi, Changhwan, Park, Kyihwan
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Electrical engineering. Electrical power engineering
Exact sciences and technology
Magnetic levitation
Magnetic levitation, propulsion and control devices
Materials science
Miscellaneous
Physics
Positive position feedback
Self-sensing
Sensorless
Specific materials
Specific materials: fabrication, treatment, testing and analysis
Various equipment and components
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Summary:A self-sensing magnetic levitation system utilizing a LC resonant circuit is proposed by using the characteristic that the inductance of the magnetic system is varied with respect to the air gap displacement. An external capacitor is added into the electric system to make the levitation system statically stable, which much relieves the control effort required to stabilize the magnetic levitation system of having an intrinsic unstable nature. For the realization of the self-sensing magnetically levitated system, an amplitude modulation/demodulation method is used with a positive position feedback controller. Experimental results are presented to validate the proposed method.
ISSN:0924-4247
1873-3069
DOI:10.1016/S0924-4247(98)00230-1