Patents by Inventor Thomas Gerard Habetler

Thomas Gerard Habetler 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 and apparatus for turn fault detection in multi-phase AC motors
    Patent number: 6236227
    Abstract: A method for turn fault detection in a multi-phase alternating current machine includes obtaining instantaneous line-to-neutral voltages from each phase of the machine, calculating the sum of the line-to-neutral voltages, and using the sum to determine whether a turn fault exists. The line-to-neutral voltages can be filtered to reduce harmonics. In one embodiment, deviations in a time-averaged function of the sum are examined. The time-averaged function can be exponentially weighted. Each of the line-to-neutral voltages can be calibrated to remove inherent machine phase impedance imbalance prior to calculating the sum of the line-to-neutral voltages.
    Type: Grant
    Filed: July 24, 1998
    Date of Patent: May 22, 2001
    Assignee: General Electric Company
    Inventors: Gerald Burt Kliman, Thomas Gerard Habetler, Marcus Alex Cash
  • Method and apparatus for turn fault detection in multi-phase AC motors
    Patent number: 6043664
    Abstract: A method for turn fault detection in a multi-phase alternating current machine includes obtaining instantaneous line-to-neutral voltages from each phase of the machine, calculating the sum of the line-to-neutral voltages, and using the sum to determine whether a turn fault exists. The line-to-neutral voltages can be filtered to reduce harmonics. In one embodiment, deviations in a time-averaged function of the sum are examined. The time-averaged function can be exponentially weighted. Each of the line-to-neutral voltages can be calibrated to remove inherent machine phase impedance imbalance prior to calculating the sum of the line-to-neutral voltages.
    Type: Grant
    Filed: October 27, 1997
    Date of Patent: March 28, 2000
    Assignee: General Electric Company
    Inventors: Gerald Burt Kliman, Thomas Gerard Habetler, Marcus Alex Cash