The physical hardware of magnetic bearing systems has a very strong impact on the application of sliding mode control to this technology. Finite current slew rates affect the character of achievable reaching conditions; flexible rotors demand the use of state observers which then affect achievable robustness; finite controller throughput and use of switching power amplifiers has substantial impact on how chatter should be addressed. This paper formulates the sliding mode control problem for realistic rotor/magnetic actuator systems considering rotor flexibility and finite amplifier voltages. The structure of the resulting class of controllers is examined for both rigid and for flexible rotors. It is demonstrated that, fundamentally, these controllers are conventional linear state observer-based controllers acting through high-speed switching amplifiers as in conventional magnetic bearing technology.
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October 2001
Technical Papers
Sliding Mode Control of Magnetic Bearings: A Hardware Perspective
E. Maslen,
E. Maslen
Department of Mechanical, Aerospace, and Nuclear Engineering, University of Virginia, Thornton Hall, McCormick Road Charlottesville, VA 22903-2442
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D. Montie
D. Montie
Department of Mechanical, Aerospace, and Nuclear Engineering, University of Virginia, Thornton Hall, McCormick Road Charlottesville, VA 22903-2442
Search for other works by this author on:
E. Maslen
Department of Mechanical, Aerospace, and Nuclear Engineering, University of Virginia, Thornton Hall, McCormick Road Charlottesville, VA 22903-2442
D. Montie
Department of Mechanical, Aerospace, and Nuclear Engineering, University of Virginia, Thornton Hall, McCormick Road Charlottesville, VA 22903-2442
Contributed by the International Gas Turbine Institute (IGTI) 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, Indianapolis, IN, June 7–10, 1999; ASME Paper 99-GT-205. Manuscript received by IGTI, Oct. 1998; final revision received by the ASME Headquarters, Mar. 1999. Associate Editor: D. Wisler.
J. Eng. Gas Turbines Power. Oct 2001, 123(4): 878-885 (8 pages)
Published Online: March 1, 1999
Article history
Received:
October 1, 1998
Revised:
March 1, 1999
Citation
Maslen , E., and Montie, D. (March 1, 1999). "Sliding Mode Control of Magnetic Bearings: A Hardware Perspective ." ASME. J. Eng. Gas Turbines Power. October 2001; 123(4): 878–885. https://doi.org/10.1115/1.1383771
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