Zhang, W., Li, G.-J. orcid.org/0000-0002-5956-4033, Ren, B. et al. (2 more authors) (2023) Investigation of ferrofluid cooling for high power density permanent magnet machines. IEEE Transactions on Magnetics, 59 (1). 4600211. ISSN 0018-9464
Abstract
This paper investigates an advanced thermal management method adopting ferrofluid for improving the end-winding cooling of permanent magnet (PM) machines. An oil-based liquid with nano-sized ferromagnetic particles (which is known as ferrofluid) is used to fill in the cavity around the end-windings. This is to establish an effective heat flux path between the end-winding that is often regarded as hot spot in electrical machines and the external cooling system, i.e., water jacket, to improve the cooling performance of the PM machines. This improvement does not only result from the higher thermal conductivity and thermal expansion of the nanofluid with metal particles, but also from strong thermomagnetic convection generated by the magnetic body force of the ferromagnetic particles within the ferrofluid. Multiphysics models considering the interaction between the electromagnetic field, the heat transfer and the fluid dynamics have been built to study the thermal performances a PM machine under different load conditions. Several factors affecting the thermomagnetic convection such as the temperature dependent magnetization curve of the ferrofluid, the concentration and different ferromagnetic materials as well as different current densities have been investigated to analyze their influences on cooling performance. One major finding is that, compared with other coolant without magnetic body force, the ferrofluid can significantly reduce machine peak temperature, e.g., by around 36.4 °C when the current density is 22.1 A/mm 2 .
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | Ferrofluid cooling; magnetic body force; nanofluid; PM machines; thermomagnetic convection |
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 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/T017988/1 MOTOR DESIGN LTD UNSPECIFIED |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 29 Nov 2022 14:06 |
Last Modified: | 26 Sep 2024 10:18 |
Status: | Published |
Publisher: | Institute of Electrical and Electronics Engineers |
Refereed: | Yes |
Identification Number: | 10.1109/TMAG.2022.3224787 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:193666 |