Significance of Anisotropic Thermal Expansion in High Speed Electric Machines Employing NdFeB Permanent Magnets

Many high speed applications employ a surface permanent magnet (PM) machine topology with a retaining sleeve due to its robustness and ability to achieve high overall peripheral speeds as well as efficiencies. One often overlooked feature in the mechanical design of such machines, which has not achi...

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Autores principales:	Ram Kumar, Antonino La Rocca, Gaurang Vakil, David Gerada, Chris Gerada, Baylon G. Fernandes
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	anisotropic thermal expansion high speed NdFeB permanent magnet PMSM retaining sleeve Technology T
Acceso en línea:	https://doaj.org/article/cf8f86a51231416fb9b1ac788f4a5fcb
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spelling	oai:doaj.org-article:cf8f86a51231416fb9b1ac788f4a5fcb2021-11-25T17:26:41ZSignificance of Anisotropic Thermal Expansion in High Speed Electric Machines Employing NdFeB Permanent Magnets10.3390/en142275581996-1073https://doaj.org/article/cf8f86a51231416fb9b1ac788f4a5fcb2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7558https://doaj.org/toc/1996-1073Many high speed applications employ a surface permanent magnet (PM) machine topology with a retaining sleeve due to its robustness and ability to achieve high overall peripheral speeds as well as efficiencies. One often overlooked feature in the mechanical design of such machines, which has not achieved sufficient attention to date is the anisotropic thermal expansion of rare earth magnets, the degree of which varies for different magnet technologies. This paper investigates the effects of the aforementioned on the mechanical design of a high speed PM spindle machine with NdFeB magnets. The maximum allowable interference is found to be limited by the working temperature of the magnets while the minimum required interference is increased due to their anisotropic thermal expansion. Based on this, appropriate conditions are formulated to integrate a Neodymium Iron Boron (NdFeB) PM in high speed rotors. These modifications considering the shaft together with the magnet anisotropic thermal expansion are included in a proposed rotor design and validated using simulations in ANSYS mechanical environment.Ram KumarAntonino La RoccaGaurang VakilDavid GeradaChris GeradaBaylon G. FernandesMDPI AGarticleanisotropic thermal expansionhigh speedNdFeB permanent magnetPMSMretaining sleeveTechnologyTENEnergies, Vol 14, Iss 7558, p 7558 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	anisotropic thermal expansion high speed NdFeB permanent magnet PMSM retaining sleeve Technology T
spellingShingle	anisotropic thermal expansion high speed NdFeB permanent magnet PMSM retaining sleeve Technology T Ram Kumar Antonino La Rocca Gaurang Vakil David Gerada Chris Gerada Baylon G. Fernandes Significance of Anisotropic Thermal Expansion in High Speed Electric Machines Employing NdFeB Permanent Magnets
description	Many high speed applications employ a surface permanent magnet (PM) machine topology with a retaining sleeve due to its robustness and ability to achieve high overall peripheral speeds as well as efficiencies. One often overlooked feature in the mechanical design of such machines, which has not achieved sufficient attention to date is the anisotropic thermal expansion of rare earth magnets, the degree of which varies for different magnet technologies. This paper investigates the effects of the aforementioned on the mechanical design of a high speed PM spindle machine with NdFeB magnets. The maximum allowable interference is found to be limited by the working temperature of the magnets while the minimum required interference is increased due to their anisotropic thermal expansion. Based on this, appropriate conditions are formulated to integrate a Neodymium Iron Boron (NdFeB) PM in high speed rotors. These modifications considering the shaft together with the magnet anisotropic thermal expansion are included in a proposed rotor design and validated using simulations in ANSYS mechanical environment.
format	article
author	Ram Kumar Antonino La Rocca Gaurang Vakil David Gerada Chris Gerada Baylon G. Fernandes
author_facet	Ram Kumar Antonino La Rocca Gaurang Vakil David Gerada Chris Gerada Baylon G. Fernandes
author_sort	Ram Kumar
title	Significance of Anisotropic Thermal Expansion in High Speed Electric Machines Employing NdFeB Permanent Magnets
title_short	Significance of Anisotropic Thermal Expansion in High Speed Electric Machines Employing NdFeB Permanent Magnets
title_full	Significance of Anisotropic Thermal Expansion in High Speed Electric Machines Employing NdFeB Permanent Magnets
title_fullStr	Significance of Anisotropic Thermal Expansion in High Speed Electric Machines Employing NdFeB Permanent Magnets
title_full_unstemmed	Significance of Anisotropic Thermal Expansion in High Speed Electric Machines Employing NdFeB Permanent Magnets
title_sort	significance of anisotropic thermal expansion in high speed electric machines employing ndfeb permanent magnets
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/cf8f86a51231416fb9b1ac788f4a5fcb
work_keys_str_mv	AT ramkumar significanceofanisotropicthermalexpansioninhighspeedelectricmachinesemployingndfebpermanentmagnets AT antoninolarocca significanceofanisotropicthermalexpansioninhighspeedelectricmachinesemployingndfebpermanentmagnets AT gaurangvakil significanceofanisotropicthermalexpansioninhighspeedelectricmachinesemployingndfebpermanentmagnets AT davidgerada significanceofanisotropicthermalexpansioninhighspeedelectricmachinesemployingndfebpermanentmagnets AT chrisgerada significanceofanisotropicthermalexpansioninhighspeedelectricmachinesemployingndfebpermanentmagnets AT baylongfernandes significanceofanisotropicthermalexpansioninhighspeedelectricmachinesemployingndfebpermanentmagnets
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Significance of Anisotropic Thermal Expansion in High Speed Electric Machines Employing NdFeB Permanent Magnets

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