Control of an AMB to zero static force

Some active magnetic bearing (AMB) applications require that the mean, or static force exerted by the AMB is zero. Examples include hybrid fluid film - AMB bearing pairings, rotor midspan dampers, and statically indeterminant systems with stiff rotors and more than two radial AMBs. When the position...

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Autores principales:	Michael CAPLE, Eric MASLEN, Jacquelyn NAGEL, Jacob WILD
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2017
Materias:	periodic control biasing amb damper zero static force bias linearization Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/d0147c3da4f9422e9de65a910c38a593
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spelling	oai:doaj.org-article:d0147c3da4f9422e9de65a910c38a5932021-11-26T07:11:27ZControl of an AMB to zero static force2187-974510.1299/mej.17-00012https://doaj.org/article/d0147c3da4f9422e9de65a910c38a5932017-09-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/4/5/4_17-00012/_pdf/-char/enhttps://doaj.org/toc/2187-9745Some active magnetic bearing (AMB) applications require that the mean, or static force exerted by the AMB is zero. Examples include hybrid fluid film - AMB bearing pairings, rotor midspan dampers, and statically indeterminant systems with stiff rotors and more than two radial AMBs. When the position of the rotor relative to magnetic center is not known precisely, this zero force requirement can be hard to meet. A low frequency periodic biasing scheme is developed which enables a controller to detect non-zero static force by sensing rotor motion at the bias carrier frequency. A theoretical basis establishes feasibility but also the potential for coupling between control signals and the periodic bias. Simulation demonstrates that an ad-hoc bias adaptation scheme can successfully drive the static component to zero while permitting otherwise conventional control. Experimental results on a small, single DOF test rig further demonstrate the ability to drive the AMB static force to zero while adding damping to the system. Identification of the system stability boundary provides insight on the structural requirements (mechanical stiffness versus magnetic negative stiffness) and the limitations on the control gain for the biasing scheme to workMichael CAPLEEric MASLENJacquelyn NAGELJacob WILDThe Japan Society of Mechanical Engineersarticleperiodic controlbiasingamb damperzero static forcebias linearizationMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 4, Iss 5, Pp 17-00012-17-00012 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	periodic control biasing amb damper zero static force bias linearization Mechanical engineering and machinery TJ1-1570
spellingShingle	periodic control biasing amb damper zero static force bias linearization Mechanical engineering and machinery TJ1-1570 Michael CAPLE Eric MASLEN Jacquelyn NAGEL Jacob WILD Control of an AMB to zero static force
description	Some active magnetic bearing (AMB) applications require that the mean, or static force exerted by the AMB is zero. Examples include hybrid fluid film - AMB bearing pairings, rotor midspan dampers, and statically indeterminant systems with stiff rotors and more than two radial AMBs. When the position of the rotor relative to magnetic center is not known precisely, this zero force requirement can be hard to meet. A low frequency periodic biasing scheme is developed which enables a controller to detect non-zero static force by sensing rotor motion at the bias carrier frequency. A theoretical basis establishes feasibility but also the potential for coupling between control signals and the periodic bias. Simulation demonstrates that an ad-hoc bias adaptation scheme can successfully drive the static component to zero while permitting otherwise conventional control. Experimental results on a small, single DOF test rig further demonstrate the ability to drive the AMB static force to zero while adding damping to the system. Identification of the system stability boundary provides insight on the structural requirements (mechanical stiffness versus magnetic negative stiffness) and the limitations on the control gain for the biasing scheme to work
format	article
author	Michael CAPLE Eric MASLEN Jacquelyn NAGEL Jacob WILD
author_facet	Michael CAPLE Eric MASLEN Jacquelyn NAGEL Jacob WILD
author_sort	Michael CAPLE
title	Control of an AMB to zero static force
title_short	Control of an AMB to zero static force
title_full	Control of an AMB to zero static force
title_fullStr	Control of an AMB to zero static force
title_full_unstemmed	Control of an AMB to zero static force
title_sort	control of an amb to zero static force
publisher	The Japan Society of Mechanical Engineers
publishDate	2017
url	https://doaj.org/article/d0147c3da4f9422e9de65a910c38a593
work_keys_str_mv	AT michaelcaple controlofanambtozerostaticforce AT ericmaslen controlofanambtozerostaticforce AT jacquelynnagel controlofanambtozerostaticforce AT jacobwild controlofanambtozerostaticforce
_version_	1718409745499422720

Control of an AMB to zero static force

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