Patents by Inventor Helle Wraae

Helle Wraae 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).

  • Control Method
    Publication number: 20090273187
    Abstract: A generator of a wind turbine is at low power conditions operated as a motor by control of a frequency converter to feed electric power from an electric power transmission network to the generator for raising the speed of the wind rotor above a predetermined level for lubricating rotating parts of a drive train of the wind turbine.
    Type: Application
    Filed: March 27, 2009
    Publication date: November 5, 2009
    Inventors: Lars Gertmar, Leif-Erik Wraae, Helle Wraae, Hans C. Christensen, Juhani Mantere, Erik Koldby