Transpermeance amplifier applied to magnetic bearings
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRN |
Texto Completo: | https://repositorio.ufrn.br/handle/123456789/30962 |
Resumo: | The most conventional approach of controlling magnetic forces in active magnetic bearings (AMBs) is through current feedback amplifiers: transconductance. This enables the operation of the AMB to be understood in terms of a relatively simple current-based model as has been widely reported on in the literature. The alternative notion of using transpermeance amplifiers, which approximate the feedback of gap flux rather than current, has been in commercial use in some form for at least thirty years, however is only recently seeing more widespread acceptance as a commercial standard. This study explores how such alternative amplifiers should be modeled and then examines the differences in behavior between AMBs equipped with transconductance and transpermeance amplifiers. The focus of this study is on two aspects. The first is the influence of rotor displacement on AMB force, commonly modeled as a constant negative equivalent mechanical stiffness, and it is shown that either scheme actually leads to a finite bandwidth effect, but that this bandwidth is much lower when transpermeance is employed. The second aspect is the influence of eddy currents. Using a very simple model of eddy currents (a secondary short-circuited coil), it is demonstrated that transpermeance amplifiers can recover significant actuator bandwidth compared with transconductance, but at the cost of needing increased peak current headroom |
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Ferreira, Jossana Maria De SouzaMaslen, EricFittro, Roger2020-12-11T16:03:46Z2020-12-11T16:03:46Z2017-02-15FERREIRA, Jossana; MASLEN, Eric; FITTRO, Roger. Transpermeance Amplifier Applied to Magnetic Bearings. Actuators, [S.L.], v. 6, n. 1, p. 9-9, 15 fev. 2017. Disponível em: https://www.mdpi.com/2076-0825/6/1/9. Acesso em: 16 out. 2020. http://dx.doi.org/10.3390/act6010009.2076-0825https://repositorio.ufrn.br/handle/123456789/3096210.3390/act6010009MDPIAttribution 3.0 Brazilhttp://creativecommons.org/licenses/by/3.0/br/info:eu-repo/semantics/openAccessTranspermeanceFlux feedbackFlux estimationAMB bandwidthActuatorsAmplifiersEddy currentTranspermeance amplifier applied to magnetic bearingsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleThe most conventional approach of controlling magnetic forces in active magnetic bearings (AMBs) is through current feedback amplifiers: transconductance. This enables the operation of the AMB to be understood in terms of a relatively simple current-based model as has been widely reported on in the literature. The alternative notion of using transpermeance amplifiers, which approximate the feedback of gap flux rather than current, has been in commercial use in some form for at least thirty years, however is only recently seeing more widespread acceptance as a commercial standard. This study explores how such alternative amplifiers should be modeled and then examines the differences in behavior between AMBs equipped with transconductance and transpermeance amplifiers. The focus of this study is on two aspects. The first is the influence of rotor displacement on AMB force, commonly modeled as a constant negative equivalent mechanical stiffness, and it is shown that either scheme actually leads to a finite bandwidth effect, but that this bandwidth is much lower when transpermeance is employed. The second aspect is the influence of eddy currents. Using a very simple model of eddy currents (a secondary short-circuited coil), it is demonstrated that transpermeance amplifiers can recover significant actuator bandwidth compared with transconductance, but at the cost of needing increased peak current headroomengreponame:Repositório Institucional da UFRNinstname:Universidade Federal do Rio Grande do Norte (UFRN)instacron:UFRNORIGINALTranspermeanceAmplifier_FERREIRA_2017.pdfTranspermeanceAmplifier_FERREIRA_2017.pdfapplication/pdf2170297https://repositorio.ufrn.br/bitstream/123456789/30962/1/TranspermeanceAmplifier_FERREIRA_2017.pdf0eddbebafb2f3771df8cb38004f68ce6MD51TEXTTranspermeanceAmplifier_FERREIRA_2017.pdf.txtTranspermeanceAmplifier_FERREIRA_2017.pdf.txtExtracted texttext/plain59391https://repositorio.ufrn.br/bitstream/123456789/30962/4/TranspermeanceAmplifier_FERREIRA_2017.pdf.txt4570d49db14a277a345e269805d61426MD54THUMBNAILTranspermeanceAmplifier_FERREIRA_2017.pdf.jpgTranspermeanceAmplifier_FERREIRA_2017.pdf.jpgGenerated Thumbnailimage/jpeg1585https://repositorio.ufrn.br/bitstream/123456789/30962/5/TranspermeanceAmplifier_FERREIRA_2017.pdf.jpg08077d7cbd907dbbbf16915276e7b518MD55CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8914https://repositorio.ufrn.br/bitstream/123456789/30962/2/license_rdf4d2950bda3d176f570a9f8b328dfbbefMD52LICENSElicense.txtlicense.txttext/plain; charset=utf-81484https://repositorio.ufrn.br/bitstream/123456789/30962/3/license.txte9597aa2854d128fd968be5edc8a28d9MD53123456789/309622020-12-13 05:01:22.816oai:https://repositorio.ufrn.br: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Repositório de PublicaçõesPUBhttp://repositorio.ufrn.br/oai/opendoar:2020-12-13T08:01:22Repositório Institucional da UFRN - Universidade Federal do Rio Grande do Norte (UFRN)false |
dc.title.pt_BR.fl_str_mv |
Transpermeance amplifier applied to magnetic bearings |
title |
Transpermeance amplifier applied to magnetic bearings |
spellingShingle |
Transpermeance amplifier applied to magnetic bearings Ferreira, Jossana Maria De Souza Transpermeance Flux feedback Flux estimation AMB bandwidth Actuators Amplifiers Eddy current |
title_short |
Transpermeance amplifier applied to magnetic bearings |
title_full |
Transpermeance amplifier applied to magnetic bearings |
title_fullStr |
Transpermeance amplifier applied to magnetic bearings |
title_full_unstemmed |
Transpermeance amplifier applied to magnetic bearings |
title_sort |
Transpermeance amplifier applied to magnetic bearings |
author |
Ferreira, Jossana Maria De Souza |
author_facet |
Ferreira, Jossana Maria De Souza Maslen, Eric Fittro, Roger |
author_role |
author |
author2 |
Maslen, Eric Fittro, Roger |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Ferreira, Jossana Maria De Souza Maslen, Eric Fittro, Roger |
dc.subject.por.fl_str_mv |
Transpermeance Flux feedback Flux estimation AMB bandwidth Actuators Amplifiers Eddy current |
topic |
Transpermeance Flux feedback Flux estimation AMB bandwidth Actuators Amplifiers Eddy current |
description |
The most conventional approach of controlling magnetic forces in active magnetic bearings (AMBs) is through current feedback amplifiers: transconductance. This enables the operation of the AMB to be understood in terms of a relatively simple current-based model as has been widely reported on in the literature. The alternative notion of using transpermeance amplifiers, which approximate the feedback of gap flux rather than current, has been in commercial use in some form for at least thirty years, however is only recently seeing more widespread acceptance as a commercial standard. This study explores how such alternative amplifiers should be modeled and then examines the differences in behavior between AMBs equipped with transconductance and transpermeance amplifiers. The focus of this study is on two aspects. The first is the influence of rotor displacement on AMB force, commonly modeled as a constant negative equivalent mechanical stiffness, and it is shown that either scheme actually leads to a finite bandwidth effect, but that this bandwidth is much lower when transpermeance is employed. The second aspect is the influence of eddy currents. Using a very simple model of eddy currents (a secondary short-circuited coil), it is demonstrated that transpermeance amplifiers can recover significant actuator bandwidth compared with transconductance, but at the cost of needing increased peak current headroom |
publishDate |
2017 |
dc.date.issued.fl_str_mv |
2017-02-15 |
dc.date.accessioned.fl_str_mv |
2020-12-11T16:03:46Z |
dc.date.available.fl_str_mv |
2020-12-11T16:03:46Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
FERREIRA, Jossana; MASLEN, Eric; FITTRO, Roger. Transpermeance Amplifier Applied to Magnetic Bearings. Actuators, [S.L.], v. 6, n. 1, p. 9-9, 15 fev. 2017. Disponível em: https://www.mdpi.com/2076-0825/6/1/9. Acesso em: 16 out. 2020. http://dx.doi.org/10.3390/act6010009. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufrn.br/handle/123456789/30962 |
dc.identifier.issn.none.fl_str_mv |
2076-0825 |
dc.identifier.doi.none.fl_str_mv |
10.3390/act6010009 |
identifier_str_mv |
FERREIRA, Jossana; MASLEN, Eric; FITTRO, Roger. Transpermeance Amplifier Applied to Magnetic Bearings. Actuators, [S.L.], v. 6, n. 1, p. 9-9, 15 fev. 2017. Disponível em: https://www.mdpi.com/2076-0825/6/1/9. Acesso em: 16 out. 2020. http://dx.doi.org/10.3390/act6010009. 2076-0825 10.3390/act6010009 |
url |
https://repositorio.ufrn.br/handle/123456789/30962 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
Attribution 3.0 Brazil http://creativecommons.org/licenses/by/3.0/br/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Attribution 3.0 Brazil http://creativecommons.org/licenses/by/3.0/br/ |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
MDPI |
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MDPI |
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UFRN |
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UFRN |
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Repositório Institucional da UFRN |
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