Patents by Inventor David J. Cisler

David J. Cisler 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 for stabilizing AC induction motor having an open loop inverter
    Patent number: 5977741
    Abstract: A method and apparatus for minimizing motor instability under no load conditions, the method including identifying instability by comparing consecutive current half cycle periods and, where the difference between half cycle periods is sufficiently large, determining that instability exists and modifying controller modulating waveforms by reducing waveform magnitude until stability is achieved. Preferably the apparatus for achieving stability includes only a single current zero crossing sensor to minimize hardware costs.
    Type: Grant
    Filed: November 17, 1998
    Date of Patent: November 2, 1999
    Assignee: Allen-Bradley Company, LLC
    Inventors: Robert J. DeLange, David J. Cisler