Completion of analytical model of active magnetic thrust bearings including asymmetric air gap field between mixed materials

The electrodynamics of magnetic thrust bearings are characterized by an above-average dependency on the bearing materials. Axially directed fields render laminated stators and rotors ineffective. High induced voltages inside the magnetic core evoke eddy currents and opposing fields, which are compen...

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Autores principales:	Robert SEIFERT, Wilfried HOFMANN
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2017
Materias:	active magnetic thrust bearings fractional order systems eddy currents magnetic levitation control soft magnetic composites analytical modeling Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/689b7c0ee5924ac68493b344f80430d7
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spelling	oai:doaj.org-article:689b7c0ee5924ac68493b344f80430d72021-11-26T07:11:27ZCompletion of analytical model of active magnetic thrust bearings including asymmetric air gap field between mixed materials2187-974510.1299/mej.16-00696https://doaj.org/article/689b7c0ee5924ac68493b344f80430d72017-08-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/4/5/4_16-00696/_pdf/-char/enhttps://doaj.org/toc/2187-9745The electrodynamics of magnetic thrust bearings are characterized by an above-average dependency on the bearing materials. Axially directed fields render laminated stators and rotors ineffective. High induced voltages inside the magnetic core evoke eddy currents and opposing fields, which are compensated by an additional magnetizing current causing a significant delay between the measurable coil current and the force-related magnetic flux. The control dynamics are hampered and even though this effect can be reduced by the use of Soft Magnetic Composites (SMC) for non-rotating parts, the thrust disk is usually made out of steel due to its superior tensile strength and saturation flux density. The analytical modeling of mixed-material magnetic thrust bearings reveals new challenges arising from asymmetries and low permeable magnetic core sections, both of which are addressed in this article. In case the air gap is bounded by core sections made of different materials the established analytical models are not applicable and require the presented asymmetrical air gap wave propagation constant. Furthermore the consideration of the stator corner reluctances for SMC cores compensates the stationary error of 6% of the total effective reluctance present in previous works.Robert SEIFERTWilfried HOFMANNThe Japan Society of Mechanical Engineersarticleactive magnetic thrust bearingsfractional order systemseddy currentsmagnetic levitation controlsoft magnetic compositesanalytical modelingMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 4, Iss 5, Pp 16-00696-16-00696 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	active magnetic thrust bearings fractional order systems eddy currents magnetic levitation control soft magnetic composites analytical modeling Mechanical engineering and machinery TJ1-1570
spellingShingle	active magnetic thrust bearings fractional order systems eddy currents magnetic levitation control soft magnetic composites analytical modeling Mechanical engineering and machinery TJ1-1570 Robert SEIFERT Wilfried HOFMANN Completion of analytical model of active magnetic thrust bearings including asymmetric air gap field between mixed materials
description	The electrodynamics of magnetic thrust bearings are characterized by an above-average dependency on the bearing materials. Axially directed fields render laminated stators and rotors ineffective. High induced voltages inside the magnetic core evoke eddy currents and opposing fields, which are compensated by an additional magnetizing current causing a significant delay between the measurable coil current and the force-related magnetic flux. The control dynamics are hampered and even though this effect can be reduced by the use of Soft Magnetic Composites (SMC) for non-rotating parts, the thrust disk is usually made out of steel due to its superior tensile strength and saturation flux density. The analytical modeling of mixed-material magnetic thrust bearings reveals new challenges arising from asymmetries and low permeable magnetic core sections, both of which are addressed in this article. In case the air gap is bounded by core sections made of different materials the established analytical models are not applicable and require the presented asymmetrical air gap wave propagation constant. Furthermore the consideration of the stator corner reluctances for SMC cores compensates the stationary error of 6% of the total effective reluctance present in previous works.
format	article
author	Robert SEIFERT Wilfried HOFMANN
author_facet	Robert SEIFERT Wilfried HOFMANN
author_sort	Robert SEIFERT
title	Completion of analytical model of active magnetic thrust bearings including asymmetric air gap field between mixed materials
title_short	Completion of analytical model of active magnetic thrust bearings including asymmetric air gap field between mixed materials
title_full	Completion of analytical model of active magnetic thrust bearings including asymmetric air gap field between mixed materials
title_fullStr	Completion of analytical model of active magnetic thrust bearings including asymmetric air gap field between mixed materials
title_full_unstemmed	Completion of analytical model of active magnetic thrust bearings including asymmetric air gap field between mixed materials
title_sort	completion of analytical model of active magnetic thrust bearings including asymmetric air gap field between mixed materials
publisher	The Japan Society of Mechanical Engineers
publishDate	2017
url	https://doaj.org/article/689b7c0ee5924ac68493b344f80430d7
work_keys_str_mv	AT robertseifert completionofanalyticalmodelofactivemagneticthrustbearingsincludingasymmetricairgapfieldbetweenmixedmaterials AT wilfriedhofmann completionofanalyticalmodelofactivemagneticthrustbearingsincludingasymmetricairgapfieldbetweenmixedmaterials
_version_	1718409722318553088

Completion of analytical model of active magnetic thrust bearings including asymmetric air gap field between mixed materials

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