Patents by Inventor Christopher John Spruce

Christopher John Spruce has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for damping edgewise oscillations in one or more blades of a wind turbine, an active stall controlled wind turbine and use hereof
    Patent number: 8070437
    Abstract: A method for damping edgewise oscillations in one or more blades of a wind turbine includes the steps of detecting if one or more of the blades oscillates edgewise during operation of the wind turbine, and substantially cyclically generating a pitch angle difference between at least two of the blades. Further provided is an active stall controlled wind turbine and use hereof.
    Type: Grant
    Filed: June 8, 2009
    Date of Patent: December 6, 2011
    Assignee: Vestas Wind Systems A/S
    Inventors: Thomas Steiniche Bjertrup Nielsen, Bo Juul Pedersen, Christopher John Spruce
  • Method for damping tower oscillations, an active stall controlled wind turbine and use hereof
    Patent number: 7919880
    Abstract: The invention relates to a method for damping tower oscillations in the tower of an active stall controlled wind turbine. The method comprises the steps of operating two or more blades of the wind turbine in a stall condition, detecting if the tower oscillates beyond a predefined level, and establishing different stall conditions between at least two of the blades, wherein the different stall conditions are established by offsetting the pitch angle of at least a first blade in relation to the pitch angle of one further blade. The invention further relates to an active stall controlled wind turbine and use hereof.
    Type: Grant
    Filed: April 24, 2009
    Date of Patent: April 5, 2011
    Assignee: Vestas Wind Systems A/S
    Inventors: Thomas Steiniche Bjertrup Nielsen, Bo Juul Pedersen, Christopher John Spruce
  • Wind turbine, a method for damping edgewise oscillations in one or more blades of a wind turbine by changing the blade pitch and use hereof
    Patent number: 7854589
    Abstract: The invention relates to a wind turbine comprising a rotor including one or more pitchable blades, and detection means for detecting edgewise oscillations in one or more of said blades. The wind turbine is characterized in that the wind turbine comprises control means for changing the pitch angle of one or more of the blades if the detection means detects edgewise oscillations in one or more of the blades, hereby damping or eliminating the edgewise oscillations. The invention further relates to a method for damping edgewise oscillations in one or more blades of a wind turbine and use hereof.
    Type: Grant
    Filed: April 2, 2009
    Date of Patent: December 21, 2010
    Assignee: Vestas Wind Systems A/S
    Inventors: Thomas Steiniche Bjertrup Nielsen, Christopher John Spruce
  • Method For Damping Edgewise Oscillations In One Or More Blades Of A Wind Turbine, An Active Stall Controlled Wind Turbine And Use Hereof
    Publication number: 20090246020
    Abstract: A method for damping edgewise oscillations in one or more blades of a wind turbine includes the steps of detecting if one or more of the blades oscillates edgewise during operation of the wind turbine, and substantially cyclically generating a pitch angle difference between at least two of the blades. Further provided is an active stall controlled wind turbine and use hereof.
    Type: Application
    Filed: June 8, 2009
    Publication date: October 1, 2009
    Inventors: Thomas Steiniche Bjertrup Nielsen, Bo Juul Pedersen, Christopher John Spruce
  • Method For Damping Tower Oscillations, An Active Stall Controlled Wind Turbine And Use Hereof
    Publication number: 20090200804
    Abstract: The invention relates to a method for damping tower oscillations in the tower of an active stall controlled wind turbine. The method comprises the steps of operating two or more blades of the wind turbine in a stall condition, detecting if the tower oscillates beyond a predefined level, and establishing different stall conditions between at least two of the blades, wherein the different stall conditions are established by offsetting the pitch angle of at least a first blade in relation to the pitch angle of one further blade. The invention further relates to an active stall controlled wind turbine and use hereof.
    Type: Application
    Filed: April 24, 2009
    Publication date: August 13, 2009
    Inventors: Thomas Steiniche Bjertrup Nielsen, Bo Juul Pedersen, Christopher John Spruce
  • Wind Turbine, A Method For Damping Edgewise Oscillations In One Or More Blades Of A Wind Turbine By Changing The Blade Pitch And Use Hereof
    Publication number: 20090185901
    Abstract: The invention relates to a wind turbine comprising a rotor including one or more pitchable blades, and detection means for detecting edgewise oscillations in one or more of said blades. The wind turbine is characterized in that the wind turbine comprises control means for changing the pitch angle of one or more of the blades if the detection means detects edgewise oscillations in one or more of the blades, hereby damping or eliminating the edgewise oscillations. The invention further relates to a method for damping edgewise oscillations in one or more blades of a wind turbine and use hereof.
    Type: Application
    Filed: April 2, 2009
    Publication date: July 23, 2009
    Inventors: Thomas Steiniche Bjertrup Nielsen, Christopher John Spruce