Patents by Inventor Holger Wrede

Holger Wrede 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 of and apparatus for compensation of oscillation effects in the event of mains asymmetry in a double-fed asynchronous machine
    Patent number: 8415818
    Abstract: In a method for the compensation of rotor torque oscillations upon the occurrence of mains asymmetries in relation to a double-fed asynchronous machine (1) it is provided that at least one respective currently prevailing machine parameter is measured and/or derived, the at least one machine parameter is respectively decomposed by calculation into a positive and a negative sequence system component and optionally a DC component, and for the positive sequence system component, the negative sequence system component and optionally for the DC component of the at least one machine parameter, there are respective separate control members for controlling an adjusting value, to which the respective components of the machine parameters are fed as input components and the output values of which are additively superposed. In that case the control members are so adapted for controlling the adjusting value in such a way that the torque oscillations are counteracted.
    Type: Grant
    Filed: August 9, 2008
    Date of Patent: April 9, 2013
    Assignee: Woodward Kempen GmbH
    Inventors: Stephan Engelhardt, Holger Wrede, Andrzej Geniusz
  • METHOD OF AND APPARATUS FOR COMPENSATION OF OSCILLATION EFFECTS IN THE EVENT OF MAINS ASYMMETRY IN A DOUBLE-FED ASYNCHRONOUS MACHINE
    Publication number: 20110153092
    Abstract: In a method for the compensation of rotor torque oscillations upon the occurrence of mains asymmetries in relation to a double-fed asynchronous machine (1) it is provided that at least one respective currently prevailing machine parameter is measured and/or derived, the at least one machine parameter is respectively decomposed by calculation into a positive and a negative sequence system component and optionally a DC component, and for the positive sequence system component, the negative sequence system component and optionally for the DC component of the at least one machine parameter, there are respective separate control members for controlling an adjusting value, to which the respective components of the machine parameters are fed as input components and the output values of which are additively superposed. In that case the control members are so adapted for controlling the adjusting value in such a way that the torque oscillations are counteracted.
    Type: Application
    Filed: August 9, 2008
    Publication date: June 23, 2011
    Applicant: Woodward Seg GMBH & Co.Kg
    Inventors: Stephan Engelhardt, Holger Wrede, Andrzej Geniusz