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TECHNICAL PAPERS

Tip Clearance Actuation With Magnetic Bearings for High-Speed Compressor Stall Control

[+] Author and Article Information
Z. S. Spakovszky, J. D. Paduano

Gas Turbine Laboratory, Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, MA 02139

R. Larsonneur, A. Traxler

MECOS Traxler AG, Winterthur, CH 8404, Switzerland

M. M. Bright

NASA Glenn Research Center, Cleveland, OH 44135

J. Turbomach 123(3), 464-472 (Feb 01, 2000) (9 pages) doi:10.1115/1.1370163 History: Received February 01, 2000
Copyright © 2001 by ASME
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References

Figures

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Active tip-clearance stall control concept
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Design process for an axial compressor magnetic bearing system
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NASA Glenn high-speed single-stage compressor test facility
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Preliminary magnetic bearing compressor rotor and corresponding lumped parameter model
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Preliminary open loop rotor model eigenvalues and mode shapes
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Transfer function from magnetic bearing force input [N] to blade tip deflection [μm]
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Closed loop magnetic bearing compressor system for stall control
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Spectral analysis of open loop prestall pressure perturbations (experiment by Weigl et al. 2) and of open loop compressor model
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Open loop compressor dynamics (×) and closed loop poles with constant gain control (+)
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Pole configuration and rotor lamination of magnetic bearing servo-actuator
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Campbell diagram of magnetic bearing servo-actuator (forward and backward whirling modes are marked solid and dashed, respectively)
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Current-force characteristic of magnetic bearing servo-actuator and operating locus (left); achievable whirl radii at several shaft locations and amplifier operation limits (right)

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