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

Journal Article · Mon Mar 12 00:00:00 EDT 2018 · IEEE Transactions on Industry Applications

DOI:https://doi.org/10.1109/TIA.2018.2814979· OSTI ID:1431049

Husain, Tausif ^[1]; Hasan, Iftekhar ^[1]; Sozer, Yilmaz ^[1]; Husain, Iqbal ^[2]; Muljadi, Eduard ^[3]

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1. Univ. of Akron, OH (United States)
2. North Carolina State Univ., Raleigh, NC (United States)
3. National Renewable Energy Lab. (NREL), Golden, CO (United States)

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.

• Research Organization: National Renewable Energy Lab. (NREL), Golden, CO (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• Grant/Contract Number: AC36-08GO28308
• OSTI ID: 1431049
• Report Number(s): NREL/JA-5D00-71233
• Journal Information: IEEE Transactions on Industry Applications, Vol. 54, Issue 4; ISSN 0093-9994
• Publisher: IEEE
• Country of Publication: United States
• Language: English

Related Subjects

17 WIND ENERGY
24 POWER TRANSMISSION AND DISTRIBUTION
transverse flux machine
permanent magnet machine
design of electric machine
pole number selection
pole shaping
design ratio
wind generator
high torque density