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Article

Linearizing Control of a Distributed Actuation Magnetic Bearing for Thin-Walled Rotor Systems

1
Center for Mechatronic Systems and Innovation, Department of Mechanical Engineering, Chiang Mai University, Chiang Mai 50200, Thailand
2
School of Engineering, University of Phayao, Phayao 56000, Thailand
*
Author to whom correspondence should be addressed.
Actuators 2020, 9(4), 99; https://doi.org/10.3390/act9040099
Received: 31 August 2020 / Revised: 28 September 2020 / Accepted: 30 September 2020 / Published: 7 October 2020
(This article belongs to the Special Issue Electromagnetic Levitation Actuators)
This paper describes an exact linearizing control approach for a distributed actuation magnetic bearing (DAMB) supporting a thin-walled rotor. The radial DAMB design incorporates a circular array of compact electromagnetic actuators with multi-coil winding scheme optimized for supporting thin-walled rotors. A distinguishing feature is that both the x and y components of the radial bearing force are coupled with all four of the supplied coil currents and so a closed form solution for the linearizing equations cannot be obtained. To overcome this issue, a gradient-based root-finding algorithm is proposed to solve the linearizing equations numerically in real-time. The proposed method can be applied with any chosen constraints on current values to achieve low RMS values while avoiding zero-current operating points. The approach is implemented and tested experimentally on a rotor system comprising two radial DAMBs and a uniform cylindrical shell rotor. The results show that the method achieves more accurate reproduction of demanded bearing forces, thereby simplifying the rotor suspension control design and providing improved stability and vibration control performance compared with implementations based on operating point linearization. View Full-Text
Keywords: active magnetic bearings; low bias current; vibration control; thin-walled structure; nonlinear modeling active magnetic bearings; low bias current; vibration control; thin-walled structure; nonlinear modeling
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MDPI and ACS Style

Chamroon, C.; Cole, M.O.T.; Fakkaew, W. Linearizing Control of a Distributed Actuation Magnetic Bearing for Thin-Walled Rotor Systems. Actuators 2020, 9, 99. https://doi.org/10.3390/act9040099

AMA Style

Chamroon C, Cole MOT, Fakkaew W. Linearizing Control of a Distributed Actuation Magnetic Bearing for Thin-Walled Rotor Systems. Actuators. 2020; 9(4):99. https://doi.org/10.3390/act9040099

Chicago/Turabian Style

Chamroon, Chakkapong, Matthew O.T. Cole, and Wichaphon Fakkaew. 2020. "Linearizing Control of a Distributed Actuation Magnetic Bearing for Thin-Walled Rotor Systems" Actuators 9, no. 4: 99. https://doi.org/10.3390/act9040099

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