Touchdown Bearing Development for a Magnetic Bearing System Used in a High Temperature Gas Turbine PUBLIC ACCESS

[+] Author Affiliations
Francis P. Marchand, Jr.

The Charles Stark Draper Laboratory, Inc., Cambridge, MA

Paper No. 97-GT-104, pp. V004T14A020; 6 pages
  • ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award
  • Orlando, Florida, USA, June 2–5, 1997
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7871-2
  • Copyright © 1997 by ASME


This papers describes the design and development of a touchdown bearing system. The touchdown bearing is one of the important elements in any high speed magnetic bearing system. The touchdown bearing functions to fully off-load or load share with the magnetic bearing and prevent catastrophic system failures. The proper design of this component is a critical step in the design of the total system and was not treated as a stand-alone sub-component. The impact loads which these bearings have to endure is a challenge to the designer. The high temperature environment on this bearing adds additional constraints to the design options which the designer has to work with. A design was produced, which will function under these conditions. The use of silicon nitride balls with sliver coated CPM Rex 20 races will be described. The bearing is mounted on a replaceable journal, which in turn is mounted on the magnetic bearing. Design and test data for use of these bearing materials in a high temperature gas turbine application is included in this paper.

Copyright © 1997 by ASME
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