Patents by Inventor Walter C. Davie

Walter C. Davie 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).

  • Dynamic braking for a three phase motor
    Patent number: 3975668
    Abstract: Method and apparatus for dynamically braking a multiphase motor wherein, in a first embodiment, the stator windings of the motor are connected in a six winding delta configuration and direct braking current is applied between two center taps of the configuration. A damping diode is connected across two of the delta center taps to minimize voltage transients in the windings when the direct current is removed.In a second embodiment, the stator windings are connected in a twisted Y--Y configuration, the connections to the neutral points of the two Y's of one phase winding set being interchanged and direct braking current being introduced between the two neutral points. A damping diode is connected between the center points of each Y to minimize voltage transients in the windings when the direct current is removed.
    Type: Grant
    Filed: September 25, 1972
    Date of Patent: August 17, 1976
    Assignee: Xerox Corporation
    Inventor: Walter C. Davie