In this paper, the modeling and control of reluctance-force-based magnetic suspension in cylindrical rotor, smooth air-gap bearingless motors are presented. The full suspension system dynamics, including both the destabilizing forces due to the motor field and the active magnetic suspension control forces, are modeled, and a transfer function of the bearingless motor suspension plant is derived. It is shown that the suspension system dynamics in a bearingless motor depend on the motor winding current amplitude. This requires the magnetic suspension controllers to address the changing system dynamics and to stabilize the suspension under different driving conditions. A controller design with its gains changing with the motor winding current amplitude is proposed. The derived model and the proposed controller design are verified by experiments with a hybrid hysteresis–induction type bearingless motor. It is shown that the derived mathematical model provides an effective basis for loop-shaping control design for the reluctance-force-based magnetic suspension systems in bearingless motors, and the proposed controller design can stabilize the rotor's suspension under varying excitation conditions.
Reluctance Force Magnetic Suspension Characteristics and Control for Cylindrical Rotor Bearingless Motors
Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received April 18, 2015; final manuscript received October 11, 2016; published online January 10, 2017. Assoc. Editor: Azim Eskandarian.
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Zhou, L., and Trumper, D. L. (January 10, 2017). "Reluctance Force Magnetic Suspension Characteristics and Control for Cylindrical Rotor Bearingless Motors." ASME. J. Dyn. Sys., Meas., Control. March 2017; 139(3): 031003. https://doi.org/10.1115/1.4035007
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