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Dual-rotor, radial-flux, toroidally-wound, permanent-magnet machine

United States Patent

August 2, 2005
View the Complete Patent at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
The present invention provides a novel dual-rotor, radial-flux, toroidally-wound, permanent-magnet machine. The present invention improves electrical machine torque density and efficiency. At least one concentric surface-mounted permanent magnet dual-rotor is located inside and outside of a torus-shaped stator with back-to-back windings, respectively. The machine substantially improves machine efficiency by reducing the end windings and boosts the torque density by at least doubling the air gap and optimizing the machine aspect ratio.
Qu; Ronghai (Clifton Park, NY), Lipo; Thomas A. (Middleton, WI)
Wisconsin Alumni Research Foundation (Madison, WI)
10/ 449,338
May 30, 2003
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with United States Government support awarded by the Department of Energy (DOE), Grant No. DE-AC36-99-GO10337. The United States Government has certain rights in this invention.