Zhang, W., Li, G.-J. orcid.org/0000-0002-5956-4033, Zhu, Z.Q. et al. (3 more authors) (2023) Investigation of ferrofluid cooling in modular permanent magnet machines. IEEE Transactions on Magnetics, 59 (11). 8103305. ISSN 0018-9464
Abstract
Compared with conventional non-modular machines, the flux gaps in alternate stator teeth of the modular machines can increase the winding factor and provide flux focusing effect, and hence can increase the torque/power density. In addition, the flux gaps can also be used as cooling channels to improve the thermal performance. This paper investigates an advanced cooling approach using ferrofluid as coolant to fill in the cavity around end-windings and flux gaps. The multiphysics modelling in this paper has shown that the influence of the flux gaps on machine thermal performances comes from two aspects: (1) the gravitational effect, the flux gaps allow more self-circulating coolant to transfer heat to the housing. This helps to reduce machine temperature by around 5°C for a flux gap width of 2mm; (2) the magnetic body force, i.e., the thermomagnetic effect. This is very effective in non-modular machine cooling. But its efficiency slightly deteriorates in the modular machines. This is because the self-circulation of ferrofluid in the flux gaps due to the gravitational effect has been negatively affected by the thermomagnetic effect.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023 The Authors. Except as otherwise noted, this author-accepted version of a journal article published in IEEE Transactions on Magnetics is made available via the University of Sheffield Research Publications and Copyright Policy under the terms of the Creative Commons Attribution 4.0 International License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ |
Keywords: | Ferrofluid cooling; magnetic body force; permanent magnet machine; thermomagnetic effect |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield) |
Funding Information: | Funder Grant number MOTOR DESIGN LTD UNSPECIFIED ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/T017988/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 12 Jul 2023 14:32 |
Last Modified: | 04 Oct 2024 11:56 |
Status: | Published |
Publisher: | Institute of Electrical and Electronics Engineers |
Refereed: | Yes |
Identification Number: | 10.1109/TMAG.2023.3294790 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:201289 |