21
Lothar L Pohl: Wind-turbines. May 29, 1979: US04156580 (53 worldwide citation)

The invention relates to an energy conversion system for converting kinetic energy possessed by the wind into mechanical energy, using a particular compact design for vertical axis rotors in combination with a specially adapted tower structure.


22
Amir S Mikhail, Craig L Christenson, Kevin L Cousineau, William L Erdman, William E Holley: Variable speed wind turbine generator. General Electric Company, Blakely Sokoloff Taylor & Zafman, July 29, 2003: US06600240 (53 worldwide citation)

A variable speed system for use in systems, such as, for example, wind turbines, is described. The system comprises a wound rotor induction generator, a torque controller and a proportional, integral derivative (PID) pitch controller. The torque controller controls generator torque using field orien ...


23
William K Watson: Space frame wind turbine. Seed and Berry, April 5, 1988: US04735552 (51 worldwide citation)

A new design for large wind turbines permitting a substantial reduction in weight and cost. Lightweight airfoils comprising the turbine blades are supported within an extensive space frame system which eliminates the large bending moments to which the blades of a conventional wind turbine are subjec ...


24
Orla W Larsen: In situ balancing of wind turbines. Dynamic Rotor Balancing, Christie Parker & Hale, August 25, 1992: US05140856 (51 worldwide citation)

A slowly turning rotating mass, such as a wind turbine rotor, is balanced in situ by measuring the magnitude of a phenomenon, such as acceleration, created by rotor unbalance at a location on a mass support shaft which is close to the mass. The measurement of the phenomenon is made along a line sele ...


25
Shashikanth Suryanarayanan, Aaron Avagliano, Corneliu Barbu: Vibration damping system and method for variable speed wind turbines. General Electric Company, Fletcher Yoder, December 18, 2007: US07309930 (49 worldwide citation)

A vibration damping technique for a wind turbine system is described. The wind turbine system includes a vibration damper, which provides a variable signal to control torque produced by a generator of the wind turbine system. The variable signal is based on generator speed and has a first local peak ...


26
Sheila E Widnall, William S Widnall, William E Gorgen, Jeffrey T Evernham: Flexible tailored elastic airfoil section. Flex Foil Technology, Jerry Cohen, Harvey Kaye, January 26, 1993: US05181678 (48 worldwide citation)

A flexible airfoil section for a wing or a blade comprising a streamlined shape and an elastic structure whose stiffness distribution along its chord and span is tailored to provide a desirable cambered shape with proportional increases in camber with increases in lift, mounted to a supporting struc ...


27
Manuel Torres Martinez: Wind turbines for electrical power generation. Dennis G LaPointe, Mason Law PA, July 6, 2004: US06759758 (46 worldwide citation)

Improvements to wind turbines for electrical power generation, incorporating a blade (


28
John Douglas D Atre, Anthony Michael Klodowski, Allen Michael Ritter, David Smith, Robert Gregory Wagoner, Luis Jose Garces, Henning Luetze: System and method for power control in wind turbines. General Electric Company, James E McGinness Esq, Armstrong Teasdale, July 3, 2007: US07239036 (45 worldwide citation)

A system and method for power control in wind turbines are provided. The method includes switching a plurality of switching devices in a power conversion component of the wind turbine system in a normal switching mode to provide power flow through the power conversion component. The method further i ...


29
Robert S Krolick, James S Storey, Robin E LeFever: Helicoidal structures, useful as wind turbines. Wind Production Company, David Pressman, November 24, 1987: US04708592 (42 worldwide citation)

A collapsible structure comprising a non-rigid helicoidal sheet braced by light-weight members according to one of several methods. The structure is used in the construction of a wind turbine, wherein a flexible fabric sheet (21) is reinforced by wires (42) sewn into its edges, and may be further re ...


30
Allan P Henderson: Tilt-up and telescopic support tower for large structures. Z Tek, Jacobson Holman PLLC, August 31, 2004: US06782667 (42 worldwide citation)

A support tower for large structures such as wind turbines generators, microwave structures, high voltage transmission lines or the like, constructed of telescopic sections with the lowermost section having an edge portion pivotally connected to a foundation to enable the tower sections to be transp ...



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