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 journalArticlepeer-review

15 Scopus Citations


This paper presents the design considerations of a double-sided transverse flux machine (TFM) for direct-drive wind turbine applications. The proposed TFM has a modular structure with quasi-U stator cores and toroidal ring windings. The rotor is constructed with ferrite magnets in a flux-concentrating setup to achieve high air gap flux density. Pole number selection is critical in the design process of a TFM as 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 initial 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 (FEA). A proof-of-concept prototype was developed to experimentally validate the FEA results.
Original languageAmerican English
Pages (from-to)3604-3615
Number of pages12
JournalIEEE Transactions on Industry Applications
Issue number4
StatePublished - 2018

NREL Publication Number

  • NREL/JA-5D00-71233


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


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