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Actuators 2017, 6(1), 4; doi:10.3390/act6010004

Fractional Order PID Control of Rotor Suspension by Active Magnetic Bearings

1
Department of Electrical Engineering, Royal Thai Air Force Academy, 171/1 Phaholyothin Rd., Saimai, Bangkok 10220, Thailand
2
Charles L. Brown Department of Electrical and Computer Engineering, University of Virginia, Charlottesville, VA 22904-4743, USA
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Eric H. Maslen
Received: 30 November 2016 / Revised: 28 December 2016 / Accepted: 3 January 2017 / Published: 13 January 2017
(This article belongs to the Special Issue Active Magnetic Bearing Actuators)

Abstract

One of the key issues in control design for Active Magnetic Bearing (AMB) systems is the tradeoff between the simplicity of the controller structure and the performance of the closed-loop system. To achieve this tradeoff, this paper proposes the design of a fractional order Proportional-Integral-Derivative (FOPID) controller. The FOPID controller consists of only two additional parameters in comparison with a conventional PID controller. The feasibility of FOPID for AMB systems is investigated for rotor suspension in both the radial and axial directions. Tuning methods are developed based on the evolutionary algorithms for searching the optimal values of the controller parameters. The resulting FOPID controllers are then tested and compared with a conventional PID controller, as well as with some advanced controllers such as Linear Quadratic Gausian (LQG) and H controllers. The comparison is made in terms of various stability and robustness specifications, as well as the dimensions of the controllers as implemented. Lastly, to validate the proposed method, experimental testing is carried out on a single-stage centrifugal compressor test rig equipped with magnetic bearings. The results show that, with a proper selection of gains and fractional orders, the performance of the resulting FOPID is similar to those of the advanced controllers. View Full-Text
Keywords: fractional order control; fractional order PID; rotor suspension; Active Magnetic Bearings; centrifugal compressor; evolutionary algorithm fractional order control; fractional order PID; rotor suspension; Active Magnetic Bearings; centrifugal compressor; evolutionary algorithm
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Anantachaisilp, P.; Lin, Z. Fractional Order PID Control of Rotor Suspension by Active Magnetic Bearings. Actuators 2017, 6, 4.

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