Patents by Inventor Wivina A. A. De Doncker

Wivina A. A. De Doncker 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).

  • Universal field-oriented controller
    Patent number: 4968925
    Abstract: A universal field-oriented controller (UFO) for an induction machine drive is capable of decoupling flux and torque in an arbitrary flux reference frame. Transitions between reference frames, including rotor flux, stator flux and air gap flux, are made by changing the effective stator-to-rotor turns ratio. The UFO is capable of operating in a direct field-orientation mode and an indirect field-orientation mode without requiring additional hardware or software.
    Type: Grant
    Filed: August 7, 1989
    Date of Patent: November 6, 1990
    Assignee: General Electric Company
    Inventor: Wivina A. A. De Doncker