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TECHNICAL PAPERS

Test and Theory Correlation Study for a Flexible Rotor on Fault-Tolerant Magnetic Bearings

[+] Author and Article Information
Uhn Joo Na, Alan B. Palazzolo

Texas A&M University, Mech. Engineering, College Station, TX 77843

Andrew Provenza

NASA Glenn Research Center, Cleveland, OH

J. Vib. Acoust 124(3), 359-366 (Jun 12, 2002) (8 pages) doi:10.1115/1.1467652 History: Received May 01, 2001; Revised January 01, 2002; Online June 12, 2002
Copyright © 2002 by ASME
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References

Lyons, J. P., Preston, M. A., Gurumoorthy, R., and Szczesny, P. M., 1994, “Design and Control of a Fault-Tolerant Active Magnetic Bearing System for Aircraft Engine,” Proceedings of the Fourth International Symposium on Magnetic Bearings, ETH Zurich, 449–454.
Maslen,  E. H., and Meeker,  D. C., 1995, “Fault Tolerance of Magnetic Bearings by Generalized Bias Current Linearization,” IEEE Trans. Magn., 31, pp. 2304–2314.
Meeker, D. C., 1996, “Optimal Solutions to the Inverse Problem in Quadratic Magnetic Actuators,” Ph.D. Dissertation, Mechanical Engineering, University of Virginia.
Maslen,  E. H., Sortore,  C. K., Gillies,  G. T., Williams,  R. D., Fedigan,  S. J., and Aimone,  R. J., 1999, “Fault Tolerant Magnetic Bearings,” ASME J. Eng. Gas Turbines Power, 121, pp. 504–508.
Na,  U. J., and Palazzolo,  A. B., 2000, “Optimized Realization of Fault-Tolerant Heteropolar Magnetic Bearings,” ASME J. Vibr. Acoust., 122, pp. 209–221.
Na,  U. J., and Palazzolo,  A. B., 2000, “Fault-Tolerance of Magnetic Bearings with Material Path Reluctances and Fringing Factors,” IEEE Trans. Magn., 36(6), pp. 3939–3946.
Na,  U. J., and Palazzolo,  A. B., 2001, “The Fault-Tolerant Control of Magnetic Bearings With Reduced Controller Outputs,” ASME J. Dyn. Syst., Meas., Control, 123(2), pp. 219–224.
Matsumura,  F., and Yoshimoto,  T., 1986, “System Modeling and Control of a Horizontal-Shaft Magnetic-Bearing System,” IEEE Trans. Magn., 22, pp. 197–206.
Bornstein,  K. R., 1991, “Dynamic Load Capabilities of Active Electromagnetic Bearings,” ASME J. Tribol., 113, pp. 598–603.
Keith,  F. J., Williams,  R. D., and Allaire,  P. E., 1990, “Digital Control of Magnetic Bearings Supporting a Multimass Flexible Rotor,” STLE Tribol. Trans., 33, pp. 307–314.

Figures

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Schematic of a heteropolar magnetic bearing
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Fault-tolerant magnetic bearing test rig
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Finite element model of the flexible rotor
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Schematic of the fault-tolerant controller
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Rotor whirling response at 20000 RPM
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Transient response of the current inputs to the outboard bearing
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Transient response of the flux densities at the outboard bearing
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Displacement plots (peak-peak) of 3 coils (the 6-7-8th coils) failed operation
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Displacements, TTL signals, and currents for a series of coil failure events
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Currents to the outboard bearing for 3 coils (the 6-7-8th coils) failed operation
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Transient response of the rotor displacements at the outboard bearing

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