Patents by Inventor Hermann Holfeld

Hermann Holfeld 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).

  • Wing energy unit
    Patent number: 7531910
    Abstract: The invention relates to a wind energy unit, connected to an electrical 3-phase AC network, comprising a generator with a rotor, provided with a regulator device, whereby the regulator device comprises a first and a second regulation unit. A network voltage analyzer is connected to the regulator device and the electrical 3-phase AC network, by means of which a network fault can be recognized, said network fault being defined as a deviation of the network voltage sinor representation from a given set interval, whereby the second regulation unit takes over control from the first regulation unit in the case of a recognized fault and the first regulation performs the control for a non-faulty 3-phase AC network.
    Type: Grant
    Filed: March 7, 2005
    Date of Patent: May 12, 2009
    Assignee: Siemens Aktiengesellschaft
    Inventors: Jörg Flottemesch, Hermann Holfeld, Stephan Schaller, Michael Weinhold
  • Wind Energy Unit
    Publication number: 20080157533
    Abstract: The invention relates to a wind energy unit, connected to an electrical 3-phase AC network, comprising a generator with a rotor, provided with a regulator device, whereby the regulator device comprises a first and a second regulation unit. A network voltage analyzer is connected to the regulator device and the electrical 3-phase AC network, by means of which a network fault can be recognized, said network fault being defined as a deviation of the network voltage sinor representation from a given set interval, whereby the second regulation unit takes over control from the first regulation unit in the case of a recognized fault and the first regulation performs the control for a non-faulty 3-phase AC network.
    Type: Application
    Filed: March 7, 2005
    Publication date: July 3, 2008
    Inventors: Jorg Flottemesch, Hermann Holfeld, Stephan Schaller, Michael Weinhold