Active Magnetic Bearing With Large Air Gap for Operation With a 3-Phase Power Converter PUBLIC ACCESS

[+] Author Affiliations
Thomas Gempp, Reto Schöb

Sulzer Electronics AG, Winterthur, Switzerland

Christian Redemann

Swiss Federal Institute of Technology, Zurich, Switzerland

Paper No. 99-GT-204, pp. V004T03A024; 6 pages
  • ASME 1999 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; General
  • Indianapolis, Indiana, USA, June 7–10, 1999
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7861-3
  • Copyright © 1999 by ASME


In order to reduce the costs, radial active magnetic bearings have been proposed which consist of only three electromagnets. Unfortunately it is not possible to operate the three coils with a 3-phase power converter, since the sum of the coil currents does not equal zero. Three independent amplifier channels are needed for the control of this arrangement. In this paper a radial magnetic bearing is proposed which can be operated by commercial 3-phase power amplifiers. By the use of an arrangement of permanent magnets it is possible to make the sum of the three phase currents become zero. Some problems related to this bearing arrangement as well as solutions are discussed and shown using the example of two prototype bearings.

Copyright © 1999 by ASME
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