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TECHNICAL PAPERS

Optimized Realization of Fault-Tolerant Heteropolar Magnetic Bearings

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

Texas A&M University, Mechanical Engineering, College Station, Texas 77843-3123

J. Vib. Acoust 122(3), 209-221 (Jan 01, 2000) (13 pages) doi:10.1115/1.1303072 History: Received September 01, 1999; Revised January 01, 2000
Copyright © 2000 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, pp. 449–454.
Fedigan, S. J., Williams, R. D., Shen, D., and Ross, R. A., 1996, “Design and Implementation of a Fault Tolerant Magnetic Bearings Controller,” Proceedings of the Fifth International Symposium on Magnetic Bearings, Kanazawa, Japan, pp. 307–312.
Maslen,  E. H., and Meeker,  D. C., 1995, “Fault Tolerance of Magnetic Bearings by Generalized Bias Current Linearization,” IEEE Trans. Magn., 31, No. 3, pp. 2304–2314.
Maslen, E. H., Sortore, C. K., Gillies, G. T., Williams, R. D., Fedigan, S. J., and Aimone, R. J., 1997, “A Fault Tolerant Magnetic Bearing System,” Proceedings of MAG’97, Industrial Conference and Exibition on Magnetic Bearings, pp. 231–240.
Maslen,  E. H., Hermann,  P., Scott,  M., and Humphris,  R. R., 1989, “Practical Limits to the Performance of Magnetic Bearings: Peak Force, Slew Rate, and Displacement Sensitivity,” J. Tribol., 111, pp. 331–336.
Bornstein,  K. R., 1991, “Dynamic Load Capabilities of Active Electromagnetic Bearings,” J. Tribol., 113, pp. 598–603.
Rao,  D. K., Brown,  G. V., Lewis,  P., and Hurley,  J., 1992, “Stiffness of Magnetic Bearings Subjected to Combined Static and Dynamic Loads,” J. Tribol., 114, pp. 785–789.
Meeker, D. C., 1996, “Optimal Solutions to the Inverse Problem in Quadratic Magnetic Actuators,” Ph.D. Dissertation, Univ. of Virginia, Mechanical Engineering.
Palazzolo, A. B., 1981, “Vibrations of Locally Modified Mechanical and Structural Systems,” Dissertation, Mechanical Engineering, University of Virginia.
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.
Vance, J. M., 1988, Rotordynamics of Turbomachinery, Wiley Interscience.

Figures

Grahic Jump Location
Static deflection of the rotor for the 5-6-7-8th coils failed magnetic bearing
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Finite element model of the flexible rotor
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Fault-tolerant control scheme
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Current inputs for normal operation to the 5-6-7-8th poles failed operation
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Flux densities for normal operation to the 5-6-7-8th poles failed operation
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Load capacity of the fault tolerant magnetic bearing for 6-7-8th coil failed(Upper Left), 4-6-7-8th coil failed (upper right), 5-6-7-8th coil failed (bottom left), and 2-4-6-7-8th coil failed (bottom right)
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Orbit plot for normal operation to the 5-6-7-8th poles failed operation
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Orbit plot for normal operation to the 2-4-6-7-8th poles failed operation
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Current inputs for normal operation to the 2-4-6-7-8th poles failed operation
Grahic Jump Location
Flux densities for normal operation to the 2-4-6-7-8th poles failed operation
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Steady state rotor whirling for the 2-4-6-7-8th coil failed operation
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Eight pole heteropolar equivalent magnetic circuit

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