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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

High Temperature Characterization of a Radial Magnetic Bearing for Turbomachinery

[+] Author and Article Information
Andrew J. Provenza

NASA Glenn Research Center, Cleveland, OH 44135-3191e-mail: andrew.j.provenza@nasa.gov

Gerald T. Montague

Army Research Lab, NASA Glenn Research Center, Cleveland, OH 44135e-mail: gerald.t.montague@nasa.gov

Mark J. Jansen

University of Toledo, Toledo, OHe-mail: mark.j.jansen@nasa.gov

Alan B. Palazzolo

Department of Mechanical Engineering, Texas A&M University, College Station, TXe-mail: a-palazzolo@tamu.edu

Ralph H. Jansen

University of Toledo, Toledo, OHe-mail: ralph.h.jansen@nasa.gov

J. Eng. Gas Turbines Power 127(2), 437-444 (Apr 15, 2005) (8 pages) doi:10.1115/1.1807413 History: Received October 01, 2002; Revised March 01, 2003; Online April 15, 2005
Copyright © 2005 by ASME
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References

Xu, L., Wang, L., and Schweitzer, G., 2000, “Development of Magnetic Bearings for High Temperature Suspension,” Proceedings of the 7th ISMB.
Ohsawa, M., Furuya, E., Marui, E. et al., 1998, “High Temperature Blower for a Molten Carbonate Fuel Cell Supported by Magnetic Bearings,” Proceedings of the 6th ISMB, pp. 32–41.
Mekhiche, M., Nichols, S., Oleksy, J., Young, J., Kiley, J., and Havenhill, D., 2000, “50K RPM, 1100°F Magnetic Bearings for Jet Turbine Engines,” Proceedings of the 7th ISMB.
Mekhiche, M., Nichols, S., Hevenhill, D. et al., 2000, “High-Speed, High-Temperature Magnetic Bearings for Jet Turbine Engine Application,” Proceedings of the International Conference on Electrical Machines (ICEM).
Field, R. J., and Iannello, V., 1998, “A Reliable Magnetic Bearing System for Turbomachinery,” Proceedings of the 6th ISMB, pp. 42–51.
Field, R. J., Sortore, C. K., and Iannello, V., 2000, “A Magnetic Bearing System for More-Electric Engines,” Proceedings of ASME/IGTI Turbo Expo.
Kueser, P. et al., 1967, “Properties of Magnetic Materials for Use in High-Temperature Space Power Systems,” NASA SP-3043.
Kondoleon, A., and Kelleher, W., 2000, “Soft Magnetic Alloys for High Temperature Radial Magnetic Bearings,” Proceedings of the 7th ISMB.
Fingers, R., 1999, “Creep Behavior of Thin Laminations of Iron-Cobalt Alloys for Use in Switched Reluctance Motors and Generators,” AFRL-PR-WP-TR-1999-2053.
Montague, G. T., Jansen, M. J., Provenza, A. P., Jansen, R. H., Ebihara, B., and Palazzolo, A., 2002, “Room Temperature Characterization of a Magnetic Bearing for Turbomachinery,” NASA Tech. Memo-2002-211904.
Minihan, T., Palazzolo, A., Provenza, A., Montague, G. T., and Kascak, A. F., 2002, “Fail Safe, High Temperature Magnetic Bearings,” Proceedings of the ASME/IGTI Turbo Expo.
Jansen, R. H., Ebihara, B. E., Montague, G. T., Provenza, A. J., Jansen, M. J., Palazzolo, A., Tucker, R., Preuss, J., and Hunt, A., 2003, “Design and Fabrication of a High Temperature, Radial Magnetic Bearing for Turbomachinery,” NASA Tech. Memo, 2003-212300.
Knospe, C. R., and Maslen, E. H., 1999, “Introduction to Active Magnetic Bearings,” University of Virginia Short Course.

Figures

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High-temperature magnetic bearing test facility at NASA Glenn Research Center
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Third-generation high-temperature magnetic bearing test rig
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Magnetic bearing at 538°C (1000°F)
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Six load cells supporting the outboard duplex ball bearing
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Maximum load on each magnetic axis is a vector sum of the forces from more than one C-core
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Force capacity for C-core #1 as a function of temperature
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C-core #1 force data plotted on log–log plot
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Force vs current for C-core #2 at 0 rpm
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Force vs current for C-core #2 at 15,000 rpm
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Force versus current and speed at 538°C
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Load measurements at the stator using piezoelectric actuators
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C-core #2 data at 0 rpm plotted on log–log plot
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Force as a function of current and temperature for the #2-3-4 magnetic axes at 0 rpm
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Force as a function of current and temperature for the #2-3-4 magnetic axes at 15,000 rpm
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Power system for one C-core
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Power consumption of C-core #2 at 0 rpm
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Power consumption of magnetic axis #2-3-4 at 0 rpm
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Theoretical gap between stator and rotor as a function of temperature using linear method
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Thermal map (not FEA) of rotor and stator when rig first reaches 538°C
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Thermal map (not FEA) of rotor and stator after rig at 538°C for 2.5 h
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Theoretical force prediction versus actual measured values for C-core #1

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