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Fuzzy bang-bang relay control of a single-axis active magnetic bearing system

Active magnetic bearings (AMB) are presently being utilized in various classes of rotating machinery. Although the rotor-AMB systems are open loop unstable, they are easily stabilized using feedback control schemes of which the PID controller is the most commonly used. The PID controller is however...

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Main Authors: Nagi, F.H., Inayat-Hussain, J.I., Ahmed, S.K.
Format: Article
Language:English
Published: 2017
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spelling my.uniten.dspace-50342017-11-14T07:47:07Z Fuzzy bang-bang relay control of a single-axis active magnetic bearing system Nagi, F.H. Inayat-Hussain, J.I. Ahmed, S.K. Active magnetic bearings (AMB) are presently being utilized in various classes of rotating machinery. Although the rotor-AMB systems are open loop unstable, they are easily stabilized using feedback control schemes of which the PID controller is the most commonly used. The PID controller is however only effective at the vicinity of the rotor's equilibrium position where the dynamics of the rotor-AMB system is linearized. Significant deviation of the rotor's motion from this equilibrium position may occur due to large imbalance forces. In this situation, the nonlinearity in AMBs, which arises from the relationship between the electromagnetic force, coil current and air gap, may render the PID controller ineffective. For the control of nonlinear systems, artificial intelligence techniques such as fuzzy and hybrid techniques are effective. In this paper, a new fuzzy controller is proposed for the control of a single-axis AMB system. This controller is based on the bang-bang scheme, which is an old but effective technique to control nonlinear systems in optimal time. The performance of the proposed integrated fuzzy bang-bang relay controller (FBBRC) was found to be superior to that of the optimized PD controller and the conventional fuzzy logic controller. Comparison of the FBBRC with the fuzzy logic controller cascaded with a hard limiter (FBBC) relay revealed almost equal performance. High frequency chattering was however observed in the steady-state response of the FBBC. Such chattering is known to cause instability and distortion in the amplifiers that are used to supply current to the magnetic bearing actuators. © 2009 Elsevier B.V. All rights reserved. 2017-11-14T03:21:32Z 2017-11-14T03:21:32Z 2009 Article 10.1016/j.simpat.2009.08.006 en Simulation Modelling Practice and Theory Volume 17, Issue 10, November 2009, Pages 1734-1747
institution Universiti Tenaga Nasional
building UNITEN Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Tenaga Nasional
content_source UNITEN Institutional Repository
url_provider http://dspace.uniten.edu.my/
language English
description Active magnetic bearings (AMB) are presently being utilized in various classes of rotating machinery. Although the rotor-AMB systems are open loop unstable, they are easily stabilized using feedback control schemes of which the PID controller is the most commonly used. The PID controller is however only effective at the vicinity of the rotor's equilibrium position where the dynamics of the rotor-AMB system is linearized. Significant deviation of the rotor's motion from this equilibrium position may occur due to large imbalance forces. In this situation, the nonlinearity in AMBs, which arises from the relationship between the electromagnetic force, coil current and air gap, may render the PID controller ineffective. For the control of nonlinear systems, artificial intelligence techniques such as fuzzy and hybrid techniques are effective. In this paper, a new fuzzy controller is proposed for the control of a single-axis AMB system. This controller is based on the bang-bang scheme, which is an old but effective technique to control nonlinear systems in optimal time. The performance of the proposed integrated fuzzy bang-bang relay controller (FBBRC) was found to be superior to that of the optimized PD controller and the conventional fuzzy logic controller. Comparison of the FBBRC with the fuzzy logic controller cascaded with a hard limiter (FBBC) relay revealed almost equal performance. High frequency chattering was however observed in the steady-state response of the FBBC. Such chattering is known to cause instability and distortion in the amplifiers that are used to supply current to the magnetic bearing actuators. © 2009 Elsevier B.V. All rights reserved.
format Article
author Nagi, F.H.
Inayat-Hussain, J.I.
Ahmed, S.K.
spellingShingle Nagi, F.H.
Inayat-Hussain, J.I.
Ahmed, S.K.
Fuzzy bang-bang relay control of a single-axis active magnetic bearing system
author_facet Nagi, F.H.
Inayat-Hussain, J.I.
Ahmed, S.K.
author_sort Nagi, F.H.
title Fuzzy bang-bang relay control of a single-axis active magnetic bearing system
title_short Fuzzy bang-bang relay control of a single-axis active magnetic bearing system
title_full Fuzzy bang-bang relay control of a single-axis active magnetic bearing system
title_fullStr Fuzzy bang-bang relay control of a single-axis active magnetic bearing system
title_full_unstemmed Fuzzy bang-bang relay control of a single-axis active magnetic bearing system
title_sort fuzzy bang-bang relay control of a single-axis active magnetic bearing system
publishDate 2017
_version_ 1644493596085190656
score 13.222552

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