Patents by Inventor George P. Stephan

George P. Stephan 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).

  • Control systems for AC induction motors
    Patent number: 4559485
    Abstract: An AC induction motor control system wherein two pulse trains are generated, one pulse train including a pulse for each increment of rotor movement, and the other pulse train having pulses occurring at a rate proportional to slip. The pulse trains are combined in a counter which controls formation of synthesized winding excitations developed from pre-recorded sine values. The slip pulse train is developed according to pre-recorded slip factors selected as a function of rotor speed and modified in accordance with desired torque.
    Type: Grant
    Filed: August 31, 1981
    Date of Patent: December 17, 1985
    Assignee: Kollmorgen Technologies Corporation
    Inventor: George P. Stephan