License and Technology Review
Radial Flux Radial Flux TechnologyTechnology
License StatusLicense Status
To: Small Wind Turbines, LLC (SWT)
◦ Permitted Application: 5kw -99kw small wind ◦ Permitted Territory: Worldwide◦ License Type: Exclusive◦ Right to manufacture or have manufactured◦ Right to sell and distribute◦ Subject to: Product Development & Licensing
Agreement dated January 26, 2009
Radial Flux Technology Radial Flux Technology (RFT)(RFT)
T Flux trials over a decade RFT a derived technology from T
FluxRFT prototype tested by Garrad
HassanSWT designs complete to
prototype
Key FeaturesKey Features
• Light and Compact due to its innovative design.
• Unique Permanent Magnet Technology
• High Efficiency allows use of smaller drive engine
Conventional Generator
Radial Flux Generator
Single stator
Dual stator
Traditional PMGTraditional PMG
vs. RFT PMGvs. RFT PMG
Rotor
Wind Turbine RFT Wind Turbine RFT BenefitsBenefits
A low rpm permanent magnet direct drive replaces gearbox and high rpm generator
Jacobs (US) used for comparison analysis
Generator/Gearbox weight reduced
by 43%Electrical generation efficiency
increased 30%
Wind TurbinesWind TurbinesRFT vs Jacobs Gearbox RFT vs Jacobs Gearbox
TurbineTurbineRFT
G-20-180-AJacobs20kw
Speed (rated RPM) 180 1230
Power (rated Kw) 20 20Weight (Kg) 213 262
Generator Type PMG 3 phase Synchronous Brushless 3 phase
Drive Direct 6-1 Gearbox
Gearbox Weight (Kg) No gearbox 114
Combined Efficiency (%) 96% 67.2%
Productive Operating Wind Speed (m/s)
0-12 7-12
• Conclusions 43% less weight 30% greater power
• Produces usable power from low wind speeds
Jacobs 20kw vs. RFTJacobs 20kw vs. RFT
Gearbox
Generator
RFT based TurbineRFT based Turbine
20kW RFT 20kW RFT Wind Design StatusWind Design Status
FEA completeProduction design
complete
20kW RFT Completed 20kW RFT Completed DesignDesign
20kw RFT Completed 20kw RFT Completed DesignDesign
20kw RFT Prototype Status
• Three prototypes in production• 20 kw now complete, 10 kw by 7-30-10• Machining has begun on 40 kw• All three will be complete by 8-31-10• Testing, modifications and tooling complete for 20 kw unit by 7-1-10
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