Analysis of a Permanent Magnet Levitation Actuator With Electromagnetic Control

[+] Author and Article Information
K. Nagaya

Department of Mechanical Engineering, Gunma University, Kiryu, Gunma 376, Japan

N. Arai

Simazu Production Engineering Co-LTD., Kyoto 604, Japan

J. Dyn. Sys., Meas., Control 113(3), 472-478 (Sep 01, 1991) (7 pages) doi:10.1115/1.2896434 History: Received January 19, 1990; Revised May 01, 1990; Online March 17, 2008


This paper proposes an actuator in the magnetic levitation system using a permanent magnet and an electromagnet. In this system, the gravity force of the masses is supported by a strong permanent magnet in which two identical poles face each other. The vibration due to external disturbances is controlled by use of the electromagnet by changing magnetic fluxes of one of the permanent magnets. The analytical expressions for obtaining the levitation force, spring constant, and the control force versus the electric current in the electromagnet were derived using the equation of the electromagnetic theory. Numerical simulations under the control using the optimal regulator for the magnetically levitated body were carried out. To verify the present theoretical results, experimental results were also obtained.

Copyright © 1991 by The American Society of Mechanical Engineers
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