Reluctance Force Magnetic Suspension Characteristics and Control for Cylindrical Rotor Bearingless Motors
Author(s)Zhou, Lei; Trumper, David L
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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.
DepartmentMassachusetts Institute of Technology. Department of Mechanical Engineering
Journal of Dynamic Systems, Measurement, and Control
Zhou, Lei, and David L. Trumper. “Reluctance Force Magnetic Suspension Characteristics and Control for Cylindrical Rotor Bearingless Motors.” Journal of Dynamic Systems, Measurement, and Control 139, 3 (January 2017): 031003 © 2017 ASME
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