Evaluation of AMB Turbomachinery Auxiliary Bearings

[+] Author and Article Information
R. G. Kirk

Mechanical Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0238

J. Vib. Acoust 121(2), 156-161 (Apr 01, 1999) (6 pages) doi:10.1115/1.2893958 History: Received September 01, 1998; Online February 26, 2008


The use of active magnetic bearings (AMB) for turbomachinery has experienced substantial growth during the past two decades. The advantages for many applications make AMB’s a very attractive solution for potentially low loss and efficient support for both radial and thrust loads. New machinery must be shop tested prior to shipment to the field for installation on-line. For AMB turbomachinery, one additional test is the operation of the auxiliary drop or overload bearings. A major concern is ability of the selected auxiliary bearing to withstand the contact forces following an at speed rotor drop. The proper design of AMB machinery requires the calculation of the anticipated loading for the auxiliary bearings. Analytical techniques to predict the rotor transient response are reviewed. Results of transient response evaluation of a full-size compressor rotor are presented to illustrate some of the important parameters in the design for rotor drop.

Copyright © 1999 by The American Society of Mechanical Engineers
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