Patents by Inventor Daryl Marvin

Daryl Marvin 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).

  • Elevator drive control strategy
    Patent number: 8104584
    Abstract: An elevator drive assembly (30) includes a voltage regulator (40) that selectively introduces current under certain conditions. In one example, the voltage regulator (40) introduces a negative flux current to an electric motor (32) when the motor (32) is operating under conditions corresponding to constant speed movement of an elevator car (22). In one example, the added negative flux current effectively reduces the back-EMF voltage of the motor (32) during the constant velocity portion of an elevator run. A disclosed example includes controlling the added current to maintain control over a motor torque constant, which becomes a function of the added current.
    Type: Grant
    Filed: December 20, 2005
    Date of Patent: January 31, 2012
    Assignee: Otis Elevator Company
    Inventors: Edward Piedra, Ismail Agiman, Daryl Marvin
  • Elevator Drive Control Strategy
    Publication number: 20080277209
    Abstract: An elevator drive assembly (30) includes a voltage regulator (40) that selectively introduces current under certain conditions. In one example, the voltage regulator (40) introduces a negative flux current to an electric motor (32) when the motor (32) is operating under conditions corresponding to constant speed movement of an elevator car (22). In one example, the added negative flux current effectively reduces the back-EMF voltage of the motor (32) during the constant velocity portion of an elevator run. A disclosed example includes controlling the added current to maintain control over a motor torque constant, which becomes a function of the added current.
    Type: Application
    Filed: December 20, 2005
    Publication date: November 13, 2008
    Inventors: Edward Piedra, Ismail Agiman, Daryl Marvin