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Wind turbine/generator set and method of making same

United States Patent

June 4, 2013
View the Complete Patent at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
A wind turbine comprising an electrical generator that includes a rotor assembly. A wind rotor that includes a wind rotor hub is directly coupled to the rotor assembly via a simplified connection. The wind rotor and generator rotor assembly are rotatably mounted on a central spindle via a bearing assembly. The wind rotor hub includes an opening having a diameter larger than the outside diameter of the central spindle adjacent the bearing assembly so as to allow access to the bearing assembly from a cavity inside the wind rotor hub. The spindle is attached to a turret supported by a tower. Each of the spindle, turret and tower has an interior cavity that permits personnel to traverse therethrough to the cavity of the wind rotor hub. The wind turbine further includes a frictional braking system for slowing, stopping or keeping stopped the rotation of the wind rotor and rotor assembly.
Bevington; Christopher M. (Waitsfield, VT), Bywaters; Garrett L. (Waitsfield, VT), Coleman; Clint C. (Warren, VT), Costin; Daniel P. (Montpelier, VT), Danforth; William L. (Rochester, VT), Lynch; Jonathan A. (St. Johnsbury, VT), Rolland; Robert H. (Waitsfield, VT)
Northern Power Systems Utility Scale, Inc. (Barre, VT)
13/ 032,182
February 22, 2011
GOVERNMENT LICENSE RIGHTS The U.S. Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of Subcontract YCX-1-30209-02 awarded by the National Renewable Energy Laboratory.