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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics, and Controls, Diagnostics, and Instrumentation

Three Practical Examples of Magnetic Bearing Control Design Using a Modern Tool

[+] Author and Article Information
M. Spirig, J. Schmied

Delta JS AG, Technoparkstr. 1, Zurich CH-8005, Switzerland

P. Jenckel, U. Kanne

LUST Antriebstechnik, Lahnan D-35633, Germany

J. Eng. Gas Turbines Power 124(4), 1025-1031 (Sep 24, 2002) (7 pages) doi:10.1115/1.1417483 History: Received November 01, 1999; Revised February 01, 2000; Online September 24, 2002
Copyright © 2002 by ASME
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References

Schmied, J., and Betschon, F., 1998, “Engineering for Rotors Supported on Magnetic Bearings,” Proceedings of the 6th International Symposium on Magnetic Bearings, Boston.
Maslen, E., et al., April 1989, “Practical Limits to the Performance of Magnetic Bearings: Peak Force, Slew Rate, and Displacement Sensitivity,” ASME J. Tribol.
Proceedings of MAG ’97, Session 6 & 7, 1997, “Industrial Conference and Exhibition on Magnetic Bearings,” University of Virginia, Technomic, Lancaster, PA.
Lund, J. W., 1974, “Stability and Damped Critical Speeds of a Flexible Rotor in Fluid-Film Bearings,” J. Eng. Ind.
Klement, H. D., 1993, “Berechnung der Eigenfrequenz und Stabilität von Rotoren mit MADYN,” VDI Bericht Nr. 1082.
Nelson, H. D., and Vaugh, J. M., 1976, “The Dynamics of Rotor-Bearing Systems Using Finite Elements,” J. Eng. Ind.
Schoeneck, K. A., and Hustak, J. F., 1987, “Comparison of Analytical and Field Experience for a Centrifugal Compressor Using Active Magnetic Bearings,” IMechE C104/87.
Schmied, J., Nijhuis, A. B. M., and Shultz, R. R., 1999, “Rotordynamic Design Considerations for the 23MW NAM-GLT Compressor with Magnetic Bearings,” IMechE Fluid Machinery Symposium, The Hague.
Franklin, G. F., Powell, J. D., and Workman, M. L., 1994, Digital Control of Dynamic Systems, 2nd Ed., Addison-Wesley, New York.

Figures

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Bearing transfer function of the large centrifugal compressor
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Measured and calculated responses at standstill
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Measured and calculated responses at 300 cps
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Bearing transfer function of the high speed rotor
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Natural frequencies of the modes versus speed for the free and supported rotor
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Bearing transfer function of the TMP
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Natural frequencies of the modes versus bearing stiffness and speed (rigid fixed disk)
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Natural frequencies of the modes versus bearing stiffness and speed (flexible disk)
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DE bearing response to an unbalance G2 (peak-peak amplitude)

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