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

Spooner, E. and Gordon, P. and Bumby, J. R. and French, C. D. (2005) 'Lightweight ironless-stator PM generators for direct-drive wind turbines.', IEE proceedings : electric power applications., 152 (1). pp. 17-26.


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 0.25 T 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%.

Item Type:Article
Additional Information:This paper is a postprint of a paper submitted to and accepted for publication in [IEE proceedings : electric power applications] and is subject to Institution of Electrical Engineers Copyright. The copy of record is available at IET Digital Library.
Keywords:Permanent magnet generators.
Full text:Full text not available from this repository.
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Record Created:23 Apr 2008
Last Modified:08 Apr 2009 16:21

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