Chen, L., Hopkinson, D., Wang, J. et al. (3 more authors) (2015) Reduced Dysprosium Permanent Magnets and Their Applications in Electric Vehicle Traction Motors. IEEE Transactions on Magnetics, 51 (11). 8109004. ISSN 0018-9464
Abstract
Permanent magnet (PM) machines employing rare-earth magnets are receiving increasing interest in electrical vehicle (EV) traction applications. However, a significant drawback of PM machine-based EV tractions is the extremely high cost and volatile supply of rare-earth materials, especially for dysprosium (Dy), whose price is almost 6 times higher than neodymium. This paper describes a new Dy grain boundary-diffusion process for sintered Nd2Fe14B magnets to maximize its effect on coercivity enhancement. The new process gains an 81% reduction in Dy consumption normally required by the conventional Nd2Fe14B magnets for the equivalent performance and 17% higher remanence. The investigation into the application in an interior PM (IPM) machine for a small-sized EV traction shows that compared with the conventional Nd2Fe14B magnets, despite the relatively low coercivity, the low-Dy-content magnets still withstand the thermal and demagnetization challenge over various driving operations. In addition, with the magnet's high remanence and energy product, the machine gains significant torque and energy efficiency improvements. The analysis results are validated by a series of tests carried out on a prototype IPM machine with the new magnets.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2015 IEEE |
Keywords: | Dysprosium (Dy); electric vehicles (EVs); permanent magnet (PM) machines; PMs; rare-earth material |
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) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 18 Jan 2016 15:56 |
Last Modified: | 11 Mar 2016 00:14 |
Published Version: | http://dx.doi.org/10.1109/TMAG.2015.2437373 |
Status: | Published |
Publisher: | Institute of Electrical and Electronics Engineers (IEEE) |
Refereed: | Yes |
Identification Number: | 10.1109/TMAG.2015.2437373 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:92036 |