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Type: Journal article
Title: Nonlinear Dynamics of Magnetic Bearing Systems
Author: Ji, J.
Hansen, C.
Zander, A.
Citation: Journal of Intelligent Material Systems and Structures, 2008; 19(12):1471-1491
Publisher: Technomic Publ Co Inc
Issue Date: 2008
ISSN: 1045-389X
Statement of
J.C. Ji, Colin H. Hansen and Anthony C. Zander
Abstract: Magnetic bearings use magnetic forces to support various machine components. Because of the non-contact nature of this type of suspension, magnetic bearing technology offers a number of significant advantages over conventional bearings, such as rolling element and fluid film bearings. An active magnetic bearing basically consists of an electromagnetic actuator, position sensors, power amplifiers, and a feedback controller. All of these components are characterized by nonlinear behavior and therefore the entire system is inherently nonlinear. However, in simulations of the dynamic behavior of magnetic bearing systems, the nonlinearities are usually neglected to simplify the analysis and only linear models are used. Moreover, many control techniques currently used in magnetic bearing systems are generally designed by ignoring nonlinear effects. The main reason for simplification is the intractability of the complexity of the actual model. In fact, the inherent nonlinear properties of magnetic bearing systems can lead to dynamic behavior of a magnetically suspended rotor that is distinctly different from that predicted using a simple linearized model. Therefore, the nonlinearities should be taken into account. This literature review is focused on the nonlinear dynamics of magnetic bearing systems and it provides background information on analytical methods, nonlinear vibrations resulting from a rotor contacting auxiliary bearings, and other active topics of research involving the nonlinear properties of magnetic bearing systems, such as nonlinear self-sensing magnetic bearings and nonlinear control of magnetic bearings. The review concludes with a brief discussion on current and possible future directions for research on the nonlinear dynamics of magnetic bearing systems.
Keywords: magnetic bearing systems; nonlinear vibrations; stability; bifurcations; periodic motion; chaotic motion; time delays; nonlinear rotor-dynamics; nonlinear dynamic behavior
Description: Copyright © 2008 by SAGE Publications
RMID: 0020084049
DOI: 10.1177/1045389X08088666
Appears in Collections:Mechanical Engineering publications
Environment Institute publications

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