Open loop, experimental force and power measurements of a radial, redundant-axis, magnetic bearing at temperatures to 1000°F (538°C) and rotor speeds to 15,000 rpm along with theoretical temperature and force models are presented in this paper. The experimentally measured force produced by a single C-core circuit using 22A was 600 lb (2.67 kN) at room temperature and 380 lb (1.69 kN) at 538°C. These values were compared with force predictions based on a one-dimensional magnetic circuit analysis and a thermal analysis of gap growth as a function of temperature. The analysis showed that the reduction of force at high temperature is mostly due to an increase in radial gap due to test conditions, rather than to reduced core permeability. Tests under rotating conditions showed that rotor speed has a negligible effect on the bearing’s static force capacity. One C-core required approximately 340 W of power to generate 190 lb (845 N) of magnetic force at 538°C, however the magnetic air gap was much larger than at room temperature. The data presented are after bearing operation for eleven total hours at 538°C and six thermal cycles.
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April 2005
Technical Papers
High Temperature Characterization of a Radial Magnetic Bearing for Turbomachinery
Andrew J. Provenza,
Andrew J. Provenza
NASA Glenn Research Center, Cleveland, OH 44135-3191
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Gerald T. Montague,
Gerald T. Montague
Army Research Lab, NASA Glenn Research Center, Cleveland, OH 44135
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Mark J. Jansen,
Mark J. Jansen
University of Toledo, Toledo, OH
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Alan B. Palazzolo,
Alan B. Palazzolo
Department of Mechanical Engineering, Texas A&M University, College Station, TX
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Ralph H. Jansen
Ralph H. Jansen
University of Toledo, Toledo, OH
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Andrew J. Provenza
NASA Glenn Research Center, Cleveland, OH 44135-3191
Gerald T. Montague
Army Research Lab, NASA Glenn Research Center, Cleveland, OH 44135
Mark J. Jansen
University of Toledo, Toledo, OH
Alan B. Palazzolo
Department of Mechanical Engineering, Texas A&M University, College Station, TX
Ralph H. Jansen
University of Toledo, Toledo, OH
Contributed by the International Gas Turbine Institute (IGTI) of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Paper presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Atlanta, GA, June 16–19, 2003, Paper No. 2003-GT-38870. Manuscript received by IGTI, October 2002, final revision, March 2003. Associate Editor: H. R. Simmons.
J. Eng. Gas Turbines Power. Apr 2005, 127(2): 437-444 (8 pages)
Published Online: April 15, 2005
Article history
Received:
October 1, 2002
Revised:
March 1, 2003
Online:
April 15, 2005
Citation
Provenza, A. J., Montague, G. T., Jansen, M. J., Palazzolo, A. B., and Jansen, R. H. (April 15, 2005). "High Temperature Characterization of a Radial Magnetic Bearing for Turbomachinery ." ASME. J. Eng. Gas Turbines Power. April 2005; 127(2): 437–444. https://doi.org/10.1115/1.1807413
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