Transpermeance amplifier applied to magnetic bearings

Ferreira, Jossana Maria De Souza; Maslen, Eric; Fittro, Roger

Transpermeance amplifier applied to magnetic bearings

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dc.contributor.author	Ferreira, Jossana Maria De Souza
dc.contributor.author	Maslen, Eric
dc.contributor.author	Fittro, Roger
dc.date.accessioned	2020-12-11T16:03:46Z
dc.date.available	2020-12-11T16:03:46Z
dc.date.issued	2017-02-15
dc.description.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	pt_BR
dc.identifier.citation	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.	pt_BR
dc.identifier.doi	10.3390/act6010009
dc.identifier.issn	2076-0825
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/30962
dc.language	en	pt_BR
dc.publisher	MDPI	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Transpermeance	pt_BR
dc.subject	Flux feedback	pt_BR
dc.subject	Flux estimation	pt_BR
dc.subject	AMB bandwidth	pt_BR
dc.subject	Actuators	pt_BR
dc.subject	Amplifiers	pt_BR
dc.subject	Eddy current	pt_BR
dc.title	Transpermeance amplifier applied to magnetic bearings	pt_BR
dc.type	article	pt_BR