Evaluation of the electrodynamic forces in high-speed permanent magnet machines with rotor eccentricity

In permanent magnet motors, the presence of rotor eccentricities can alter the airgap field distribution. This results in parasitic radial detent forces that can be reduced by connecting the stator phases in parallel. As a consequence, currents are passively induced in the windings when the rotor sp...

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Autores principales:	Corentin DUMONT, Adrien GILSON, Virginie KLUYSKENS, Christophe ESPANET, Bruno DEHEZ
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2017
Materias:	synchronous motor eccentricity force passive electrodynamic model Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/c563ae42db2342a0a0b376476972f7d7
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spelling	oai:doaj.org-article:c563ae42db2342a0a0b376476972f7d72021-11-26T07:11:27ZEvaluation of the electrodynamic forces in high-speed permanent magnet machines with rotor eccentricity2187-974510.1299/mej.17-00072https://doaj.org/article/c563ae42db2342a0a0b376476972f7d72017-06-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/4/5/4_17-00072/_pdf/-char/enhttps://doaj.org/toc/2187-9745In permanent magnet motors, the presence of rotor eccentricities can alter the airgap field distribution. This results in parasitic radial detent forces that can be reduced by connecting the stator phases in parallel. As a consequence, currents are passively induced in the windings when the rotor spins in an off-centered position, yielding balancing electrodynamic forces. Specific models were developed to predict these forces, but their complexity can be prohibitive. Therefore, this paper proposes to study the effect of the rotor off-centering in permanent magnet motors using a simpler model developed for electrodynamic bearings. This model consists in a linear differential equation with only four parameters that depend neither on the spin speed nor on the rotor position. As an illustration, the paper applies this model to the study of a high-speed, slotted permanent magnet motor. To support this, the main hypotheses of the model are validated in this particular case. Then, the centering electrodynamic forces in a staticeccentricity configuration are predicted using the model and compared to finite element simulation results. Finally, a preliminary study showing the impact of the width and permeability of the stator teeth on the centering force is performed.Corentin DUMONTAdrien GILSONVirginie KLUYSKENSChristophe ESPANETBruno DEHEZThe Japan Society of Mechanical EngineersarticlesynchronousmotoreccentricityforcepassiveelectrodynamicmodelMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 4, Iss 5, Pp 17-00072-17-00072 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	synchronous motor eccentricity force passive electrodynamic model Mechanical engineering and machinery TJ1-1570
spellingShingle	synchronous motor eccentricity force passive electrodynamic model Mechanical engineering and machinery TJ1-1570 Corentin DUMONT Adrien GILSON Virginie KLUYSKENS Christophe ESPANET Bruno DEHEZ Evaluation of the electrodynamic forces in high-speed permanent magnet machines with rotor eccentricity
description	In permanent magnet motors, the presence of rotor eccentricities can alter the airgap field distribution. This results in parasitic radial detent forces that can be reduced by connecting the stator phases in parallel. As a consequence, currents are passively induced in the windings when the rotor spins in an off-centered position, yielding balancing electrodynamic forces. Specific models were developed to predict these forces, but their complexity can be prohibitive. Therefore, this paper proposes to study the effect of the rotor off-centering in permanent magnet motors using a simpler model developed for electrodynamic bearings. This model consists in a linear differential equation with only four parameters that depend neither on the spin speed nor on the rotor position. As an illustration, the paper applies this model to the study of a high-speed, slotted permanent magnet motor. To support this, the main hypotheses of the model are validated in this particular case. Then, the centering electrodynamic forces in a staticeccentricity configuration are predicted using the model and compared to finite element simulation results. Finally, a preliminary study showing the impact of the width and permeability of the stator teeth on the centering force is performed.
format	article
author	Corentin DUMONT Adrien GILSON Virginie KLUYSKENS Christophe ESPANET Bruno DEHEZ
author_facet	Corentin DUMONT Adrien GILSON Virginie KLUYSKENS Christophe ESPANET Bruno DEHEZ
author_sort	Corentin DUMONT
title	Evaluation of the electrodynamic forces in high-speed permanent magnet machines with rotor eccentricity
title_short	Evaluation of the electrodynamic forces in high-speed permanent magnet machines with rotor eccentricity
title_full	Evaluation of the electrodynamic forces in high-speed permanent magnet machines with rotor eccentricity
title_fullStr	Evaluation of the electrodynamic forces in high-speed permanent magnet machines with rotor eccentricity
title_full_unstemmed	Evaluation of the electrodynamic forces in high-speed permanent magnet machines with rotor eccentricity
title_sort	evaluation of the electrodynamic forces in high-speed permanent magnet machines with rotor eccentricity
publisher	The Japan Society of Mechanical Engineers
publishDate	2017
url	https://doaj.org/article/c563ae42db2342a0a0b376476972f7d7
work_keys_str_mv	AT corentindumont evaluationoftheelectrodynamicforcesinhighspeedpermanentmagnetmachineswithrotoreccentricity AT adriengilson evaluationoftheelectrodynamicforcesinhighspeedpermanentmagnetmachineswithrotoreccentricity AT virginiekluyskens evaluationoftheelectrodynamicforcesinhighspeedpermanentmagnetmachineswithrotoreccentricity AT christopheespanet evaluationoftheelectrodynamicforcesinhighspeedpermanentmagnetmachineswithrotoreccentricity AT brunodehez evaluationoftheelectrodynamicforcesinhighspeedpermanentmagnetmachineswithrotoreccentricity
_version_	1718409743926558720

Evaluation of the electrodynamic forces in high-speed permanent magnet machines with rotor eccentricity

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