Design Considerations of a Transverse Flux Machine for DirectDrive Wind Turbine Applications
Abstract
This paper presents the design considerations of a doublesided transverse flux machine (TFM) for directdrive wind turbine applications. The TFM has a modular structure with quasiU stator cores and ring windings. The rotor is constructed with ferrite magnets in a fluxconcentrating 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 backemf and inductance is also analyzed. These investigations provide guidance toward the required design of a TFM for directdrive applications. The analyses are carried out using analytical and threedimensional finite element analysis. A prototype is under construction for experimental verification.
 Authors:
 Publication Date:
 Research Org.:
 National Renewable Energy Lab. (NREL), Golden, CO (United States)
 Sponsoring Org.:
 USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE4W)
 OSTI Identifier:
 1351842
 Report Number(s):
 NREL/CP5D0068301
 DOE Contract Number:
 AC3608GO28308
 Resource Type:
 Conference
 Resource Relation:
 Conference: Presented at the 2016 IEEE Energy Conversion Congress and Exposition (ECCE), 1822 September 2016, Milwaukee, Wisconsin
 Country of Publication:
 United States
 Language:
 English
 Subject:
 17 WIND ENERGY; transverse flux machine; permanent magnet machine; design consideration; pole number selection; pole shaping; design ratio; wind generator; high torque density
Citation Formats
Husain, Tausif, Hasan, Iftekhar, Sozer, Yilmaz, Husain, Iqbal, and Muljadi, Eduard. Design Considerations of a Transverse Flux Machine for DirectDrive Wind Turbine Applications. United States: N. p., 2017.
Web. doi:10.1109/ECCE.2016.7855015.
Husain, Tausif, Hasan, Iftekhar, Sozer, Yilmaz, Husain, Iqbal, & Muljadi, Eduard. Design Considerations of a Transverse Flux Machine for DirectDrive Wind Turbine Applications. United States. doi:10.1109/ECCE.2016.7855015.
Husain, Tausif, Hasan, Iftekhar, Sozer, Yilmaz, Husain, Iqbal, and Muljadi, Eduard. Thu .
"Design Considerations of a Transverse Flux Machine for DirectDrive Wind Turbine Applications". United States.
doi:10.1109/ECCE.2016.7855015.
@article{osti_1351842,
title = {Design Considerations of a Transverse Flux Machine for DirectDrive Wind Turbine Applications},
author = {Husain, Tausif and Hasan, Iftekhar and Sozer, Yilmaz and Husain, Iqbal and Muljadi, Eduard},
abstractNote = {This paper presents the design considerations of a doublesided transverse flux machine (TFM) for directdrive wind turbine applications. The TFM has a modular structure with quasiU stator cores and ring windings. The rotor is constructed with ferrite magnets in a fluxconcentrating 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 backemf and inductance is also analyzed. These investigations provide guidance toward the required design of a TFM for directdrive applications. The analyses are carried out using analytical and threedimensional finite element analysis. A prototype is under construction for experimental verification.},
doi = {10.1109/ECCE.2016.7855015},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Feb 16 00:00:00 EST 2017},
month = {Thu Feb 16 00:00:00 EST 2017}
}

This paper presents the design considerations of a doublesided transverse flux machine (TFM) for directdrive wind turbine applications. The TFM has a modular structure with quasiU stator cores and ring windings. The rotor is constructed with ferrite magnets in a fluxconcentrating 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 andmore »

Design Considerations of a Transverse Flux Machine for DirectDrive Wind Turbine Applications
This paper presents the design considerations of a doublesided transverse flux machine (TFM) for directdrive wind turbine applications. The TFM has a modular structure with quasiU stator cores and ring windings. The rotor is constructed with ferrite magnets in a fluxconcentrating 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 andmore » 
Design Considerations of a Transverse Flux Machine for DirectDrive Wind Turbine Applications
This paper presents the design considerations of a doublesided transverse flux machine (TFM) for directdrive wind turbine applications. The proposed TFM has a modular structure with quasiU stator cores and toroidal ring windings. The rotor is constructed with ferrite magnets in a fluxconcentrating 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 backEMF andmore » 
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This paper presents a nonlinear analytical model of a novel doublesided flux concentrating Transverse Flux Machine (TFM) based on the Magnetic Equivalent Circuit (MEC) model. The analytical model uses a seriesparallel combination of flux tubes to predict the flux paths through different parts of the machine including air gaps, permanent magnets, stator, and rotor. The twodimensional MEC model approximates the complex threedimensional flux paths of the TFM and includes the effects of magnetic saturation. The model is capable of adapting to any geometry that makes it a good alternative for evaluating prospective designs of TFM compared to finite element solversmore » 
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This paper presents a nonlinear analytical model of a novel double sided flux concentrating Transverse Flux Machine (TFM) based on the Magnetic Equivalent Circuit (MEC) model. The analytical model uses a seriesparallel combination of flux tubes to predict the flux paths through different parts of the machine including air gaps, permanent magnets (PM), stator, and rotor. The twodimensional MEC model approximates the complex threedimensional flux paths of the TFM and includes the effects of magnetic saturation. The model is capable of adapting to any geometry which makes it a good alternative for evaluating prospective designs of TFM as compared tomore »