Isotropic Optimal Control of Active Magnetic Bearing System

[+] Author and Article Information
Cheol-Soon Kim

Samsung Advanced Institute of Technology, P.O. Box Suwon 111, Korea

Chong-Won Lee

Center for Noise and Vibration Control (NOVIC), Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Science Town, Taejon 305-701, Korea

J. Dyn. Sys., Meas., Control 118(4), 721-726 (Dec 01, 1996) (6 pages) doi:10.1115/1.2802348 History: Received October 26, 1994; Online December 03, 2007


As a new rotor control scheme, isotropic control of weakly anisotropic rotor bearing system in complex state space is proposed, which utilizes the concepts on the eigenstructure of the isotropic rotor system. Advantages of the scheme are that the controlled system always retains isotropic eigenstructure, leading to circular whirling due to unbalance and that it is efficient for control of unbalance response. And the system analysis and controller design becomes simple and yet comprehensive since the order of the matrices treated in the complex domain approach is half of that in the real approach. The control scheme is applied to a rigid rotor-active magnetic bearing system which is digitally controlled and the control performance is investigated experimentally in relation to unbalance response and control energy. It is found that the isotropic optimal control method, which essentially eliminates the backward unbalance response component, is more efficient than the conventional optimal control in that it gives smaller major whirl radius and yet it often requires less control effort.

Copyright © 1996 by The American Society of Mechanical Engineers
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