This article presents the design, dynamic analysis, and control of a flywheel energy storage system. At the heart of the system is a hybrid magnetic bearing. The bearing consists of ring and disk shaped permanent magnets, and a synthetic ruby sphere on a sapphire plate. The bearing is shown to be stable without active control. Equations of motion for the flywheel are derived in a sensor based coordinate system. The resulting equations are non-singular around the nominal operating condition and are feedback linearizable without the need for a coordinate transformation. A method of modeling rotor imbalance as a set of sinusoidal disturbances of magnitudes that do not depend on rotational speed is also presented. To reject large external disturbances active control is applied to the flywheel. Two nonlinear control laws are applied and are shown to improve the initial condition response of the inherently stable system.
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December 1997
Technical Papers
Analysis and Control of a Flywheel Energy Storage System With a Hybrid Magnetic Bearing
J. D. Stienmier,
J. D. Stienmier
Department of Mechanical Engineering, Box 352600, University of Washington, Seattle, WA 98195
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S. C. Thielman,
S. C. Thielman
Department of Mechanical Engineering, Box 352600, University of Washington, Seattle, WA 98195
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B. C. Fabien
B. C. Fabien
Department of Mechanical Engineering, Box 352600, University of Washington, Seattle, WA 98195
Search for other works by this author on:
J. D. Stienmier
Department of Mechanical Engineering, Box 352600, University of Washington, Seattle, WA 98195
S. C. Thielman
Department of Mechanical Engineering, Box 352600, University of Washington, Seattle, WA 98195
B. C. Fabien
Department of Mechanical Engineering, Box 352600, University of Washington, Seattle, WA 98195
J. Dyn. Sys., Meas., Control. Dec 1997, 119(4): 650-656 (7 pages)
Published Online: December 1, 1997
Article history
Received:
August 12, 1996
Online:
December 3, 2007
Citation
Stienmier, J. D., Thielman, S. C., and Fabien, B. C. (December 1, 1997). "Analysis and Control of a Flywheel Energy Storage System With a Hybrid Magnetic Bearing." ASME. J. Dyn. Sys., Meas., Control. December 1997; 119(4): 650–656. https://doi.org/10.1115/1.2802374
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