The problem of sensor runout in magnetic bearing systems has been largely overlooked due to similarities with mass unbalance in creating periodic disturbances. While the effect of mass unbalance can be significantly reduced, if not eliminated, through rotor balancing, sensor runout disturbance is unavoidable since it originates from physical nonconcentricity between rotor and stator. Sensor runout is also caused by nonuniform electrical and magnetic properties around the sensing surface. To improve performance of magnetic bearings, we present an adaptive algorithm for sensor runout compensation. It guarantees asymptotic stability of the rotor geometric center and on-line feedforward cancellation of runout disturbances using persistent excitation. Some of the advantages of our algorithm include simplicity of design and implementation, stability, and robustness to plant parameter uncertainties. The stability and robustness properties are derived from passivity of the closed-loop system. Numerical simulations are presented to demonstrate efficacy of the algorithm and experimental results confirm stability and robustness for large variation in plant parameters.
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June 2001
Technical Papers
Adaptive Compensation of Sensor Runout for Magnetic Bearings With Uncertain Parameters: Theory and Experiments
Joga D. Setiawan, Graduate Student,
Joga D. Setiawan, Graduate Student
Department of Mechanical Engineering, 2555 Engineering Building, Michigan State University, East Lansing, MI 48824-1226
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Ranjan Mukherjee, Associate Professor,
Ranjan Mukherjee, Associate Professor
Department of Mechanical Engineering, 2555 Engineering Building, Michigan State University, East Lansing, MI 48824-1226
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Eric H. Maslen, Associate Professor
Eric H. Maslen, Associate Professor
Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA 22903
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Joga D. Setiawan, Graduate Student
Department of Mechanical Engineering, 2555 Engineering Building, Michigan State University, East Lansing, MI 48824-1226
Ranjan Mukherjee, Associate Professor
Department of Mechanical Engineering, 2555 Engineering Building, Michigan State University, East Lansing, MI 48824-1226
Eric H. Maslen, Associate Professor
Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA 22903
Contributed by the Dynamic Systems and Control Division for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received by the Dynamic Systems and Control Division September 27, 1999. Associate Editor: P. Voulgaris.
J. Dyn. Sys., Meas., Control. Jun 2001, 123(2): 211-218 (8 pages)
Published Online: September 27, 1999
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Received:
September 27, 1999
Citation
Setiawan, J. D., Mukherjee, R., and Maslen, E. H. (September 27, 1999). "Adaptive Compensation of Sensor Runout for Magnetic Bearings With Uncertain Parameters: Theory and Experiments ." ASME. J. Dyn. Sys., Meas., Control. June 2001; 123(2): 211–218. https://doi.org/10.1115/1.1369362
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