Patents by Inventor Hans-Josef Mennen

Hans-Josef Mennen 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 and system for stopping elevators using AC motors driven by static frequency converters
    Patent number: 7775327
    Abstract: The invention relates to methods for stopping elevators especially when using at least one three-phase motor operated by a static frequency converter. According to the invention, a brake relay controls the brake of the motor such that releasing of the brake relay causes the motor to be decelerated while the brake relay is coupled to a protective circuit in such a way that the control pulses required for generating the driving motor field are safely blocked when the brake relay is released.
    Type: Grant
    Filed: January 25, 2005
    Date of Patent: August 17, 2010
    Assignee: Danfoss A/S
    Inventors: Detlev Abraham, Hans-Josef Mennen
  • Method and system for stopping elevators
    Publication number: 20070187185
    Abstract: The invention relates to methods for stopping elevators especially when using at least one three-phase motor operated by a static frequency converter. According to the invention, a brake relay controls the brake of the motor such that releasing of the brake relay causes the motor to be decelerated while the brake relay is coupled to a protective circuit in such a way that the control pulses required for generating the driving motor field are safely blocked when the brake relay is released.
    Type: Application
    Filed: January 25, 2005
    Publication date: August 16, 2007
    Applicant: Danfoss Drives A/S
    Inventors: Detlev Abraham, Hans-Josef Mennen