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 22 A 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 1D 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 that 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 is after bearing operation for eleven total hours at 538°C and six thermal cycles.
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ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference
June 16–19, 2003
Atlanta, Georgia, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
0-7918-3687-8
PROCEEDINGS PAPER
High Temperature Characterization of a Radial Magnetic Bearing for Turbomachinery
Andrew J. Provenza,
Andrew J. Provenza
NASA Glenn Research Center, Cleveland, OH
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Gerald T. Montague,
Gerald T. Montague
U.S. Army Research Laboratory – NASA Glenn Research Center, Cleveland, OH
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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
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
Gerald T. Montague
U.S. Army Research Laboratory – NASA Glenn Research Center, Cleveland, OH
Mark J. Jansen
University of Toledo, Toledo, OH
Alan B. Palazzolo
Texas A&M University, College Station, TX
Ralph H. Jansen
University of Toledo, Toledo, OH
Paper No:
GT2003-38870, pp. 633-642; 10 pages
Published Online:
February 4, 2009
Citation
Provenza, AJ, Montague, GT, Jansen, MJ, Palazzolo, AB, & Jansen, RH. "High Temperature Characterization of a Radial Magnetic Bearing for Turbomachinery." Proceedings of the ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. Volume 4: Turbo Expo 2003. Atlanta, Georgia, USA. June 16–19, 2003. pp. 633-642. ASME. https://doi.org/10.1115/GT2003-38870
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