Axial flux, modular, permanent-magnet generator with a toroidal winding for wind turbine applications

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Description

Permanent-magnet generators have been used for wind turbines for many years. Many small wind turbine manufacturers use direct-drive permanent-magnet generators. For wind turbine generators, the design philosophy must cover the following characteristics: low cost, light weight, low speed, high torque, and variable speed generation. The generator is easy to manufacture and the design can be scaled up for a larger size without major retooling. A modular permanent-magnet generator with axial flux direction was chosen. The permanent magnet used is NdFeB or ferrite magnet with flux guide to focus flux density in the air gap. Each unit module of the generator ... continued below

Physical Description

6 pages

Creation Information

Muljadi, E.; Butterfield, C. P. & Wan, Y. H. July 1998.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 90 times , with 14 in the last month . More information about this article can be viewed below.

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  • Wind Energy Program (U.S.)
    Publisher Info: National Renewable Energy Lab., National Wind Technology Center, Golden, CO (United States)
    Place of Publication: Golden, Colorado

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Description

Permanent-magnet generators have been used for wind turbines for many years. Many small wind turbine manufacturers use direct-drive permanent-magnet generators. For wind turbine generators, the design philosophy must cover the following characteristics: low cost, light weight, low speed, high torque, and variable speed generation. The generator is easy to manufacture and the design can be scaled up for a larger size without major retooling. A modular permanent-magnet generator with axial flux direction was chosen. The permanent magnet used is NdFeB or ferrite magnet with flux guide to focus flux density in the air gap. Each unit module of the generator may consist of one, two, or more phases. Each generator can be expanded to two or more unit modules. Each unit module is built from simple modular poles. The stator winding is formed like a torus. Thus, the assembly process is simplified and the winding insertion in the slot is less tedious. The authors built a prototype of one unit module and performed preliminary tests in the laboratory. Follow up tests will be conducted in the lab to improve the design.

Physical Description

6 pages

Notes

OSTI as DE98007235

Source

  • Institute of Electric and Electronic Engineers (IEEE)/Industry Applications Society (IAS) conference, St. Louis, MO (US), 11/05/1998--11/08/1998; Other Information: Supercedes report DE98007235; PBD: Jul 1998

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  • Other: DE98007235
  • Report No.: NREL/CP--500-24996
  • Report No.: CONF-981114--
  • Grant Number: AC36-83CH10093
  • Office of Scientific & Technical Information Report Number: 663610
  • Archival Resource Key: ark:/67531/metadc702475

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Creation Date

  • July 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • March 25, 2016, 12:26 p.m.

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Muljadi, E.; Butterfield, C. P. & Wan, Y. H. Axial flux, modular, permanent-magnet generator with a toroidal winding for wind turbine applications, article, July 1998; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc702475/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.