Design Considerations of a Transverse Flux Machine for Direct-Drive Wind Turbine Applications

Eduard Muljadi, Tausif Husain, Iftekhar Hasan, Yilmaz Sozer, Iqbal Husain

Research output: Contribution to conferencePaper

33 Scopus Citations


This paper presents the design considerations of a double-sided transverse flux machine (TFM) for direct-drive wind turbine applications. The TFM has a modular structure with quasi-U stator cores and ring windings. The rotor is constructed with ferrite magnets in a flux-concentrating arrangement to achieve high air gap flux density. The design considerations for this TFM with respect to initial sizing, pole number selection, key design ratios, and pole shaping are presented in this paper. Pole number selection is critical in the design process of a TFM because it affects both the torque density and power factor under fixed magnetic and changing electrical loading. Several key design ratios are introduced to facilitate the design procedure. The effect of pole shaping on back-emf and inductance is also analyzed. These investigations provide guidance toward the required design of a TFM for direct-drive applications. The analyses are carried out using analytical and three-dimensional finite element analysis. A prototype is under construction for experimental verification.
Original languageAmerican English
Number of pages8
StatePublished - 2017
Event2016 IEEE Energy Conversion Congress and Exposition (ECCE) - Milwaukee, Wisconsin
Duration: 18 Sep 201622 Sep 2016


Conference2016 IEEE Energy Conversion Congress and Exposition (ECCE)
CityMilwaukee, Wisconsin

Bibliographical note

See NREL/CP-5D00-66391 for preprint

NREL Publication Number

  • NREL/CP-5D00-68301


  • design consideration
  • design ratio
  • high torque density
  • permanent magnet machine
  • pole number selection
  • pole shaping
  • transverse flux machine
  • wind generator


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