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

被引:74
作者
Spooner, E [1 ]
Gordon, P
Bumby, JR
French, CD
机构
[1] Univ Durham, Sch Engn, Evolving Generat Ltd, Durham, England
[2] Univ Newcastle Upon Tyne, Elect Dr & Machines Grp, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
来源
IEE PROCEEDINGS-ELECTRIC POWER APPLICATIONS | 2005年 / 152卷 / 01期
关键词
D O I
10.1049/ip-epa:20041084
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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%.
引用
收藏
页码:17 / 26
页数:10
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