Patents by Inventor Jeffrey L. Kohler

Jeffrey L. Kohler 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).

  • Patent number: 5270640
    Abstract: An improved method for detecting an incipient failure in a multiphase electric motor includes the following steps: periodically measuring or continuously monitoring voltage and current values at each input to the motor; determining negative sequence voltage and current values for each periodic measured input voltage and current value; calculating an effective negative sequence impedance phasor value angle from each of the determined negative sequence voltages and current values; and comparing the calculated negative sequence impedance phasor angles and/or real and imaginary components over a plurality of periodic measurements to detect a change therein, which change is indicative of an incipient failure mode.
    Type: Grant
    Filed: April 23, 1992
    Date of Patent: December 14, 1993
    Assignee: The Penn State Research Foundation
    Inventors: Jeffrey L. Kohler, Joseph Sottile, Jr.