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Lightweight ironless-stator PM generators for direct-drive wind turbines

Lookup NU author(s): Dr Chris French


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A permanent-magnet electrical machine that employs lightweight spoked structures for both rotor and stator is described. The stator is ironless so that there is no direct magnetic attraction between rotor and stator. The lightweight structures are sufficient to carry the small forces due to the interaction of the permanent magnet field with the stator winding current. Despite the absence of stator iron and a large airgap, rare-earth magnets are able to create a working flux density of about 0.25T at the winding. This is sufficient for an effective generator design because the lightweight structures offer the opportunity to build generators of unprecedented diameter. The outcome is a generator that has a mass typically 20-30% of equivalent designs based on iron-cored magnetic circuits, and with efficiency greater than 90%. © IEE, 2004.

Publication metadata

Author(s): Spooner E, Gordon P, Bumby JR, French CD

Publication type: Article

Publication status: Published

Journal: IEE Proceedings: Electric Power Applications

Year: 2005

Volume: 152

Issue: 1

Pages: 17-26

ISSN (print): 1350-2352

ISSN (electronic): 1751-8679

Publisher: IEEE


DOI: 10.1049/ip-epa:20041084


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