Patents by Inventor Peter M. Dalton

Peter M. Dalton 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).

  • Ground fault detection methods on variable frequency drive systems
    Patent number: 11329589
    Abstract: A mining machine including a motor, an adjustable speed drive providing a voltage to the motor, the voltage having an excitation component comprising a magnitude and a frequency for operating the motor at a desired speed and including an additional voltage component for use in detecting a ground fault condition, and a ground fault relay for detecting a ground fault current when the ground fault current exceeds a predetermined threshold.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: May 10, 2022
    Assignee: Joy Global Underground Mining LLC
    Inventors: Peter M. Dalton, Michael Jordan
  • Electrical filter for resistively earthed systems
    Patent number: 10925197
    Abstract: Methods and systems of suppressing ground faults. One system includes a power center including a transformer and a ground fault relay. The system also includes a first motor electrically connected to the power center. The system also includes a first variable speed drive connected to the first motor. The first variable speed drive is configured to vary the speed of the first motor. The system also includes a first common mode choke connected in a series-type connection between the power center and the first variable speed drive. The first common mode choke is configured to suppress a ground current induced by the first variable speed drive.
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: February 16, 2021
    Assignee: Joy Global Underground Mining LLC
    Inventor: Peter M. Dalton
  • ELECTRICAL FILTER FOR RESISTIVELY EARTHED SYSTEMS
    Publication number: 20200100404
    Abstract: Methods and systems of suppressing ground faults. One system includes a power center including a transformer and a ground fault relay. The system also includes a first motor electrically connected to the power center. The system also includes a first variable speed drive connected to the first motor. The first variable speed drive is configured to vary the speed of the first motor. The system also includes a first common mode choke connected in a series-type connection between the power center and the first variable speed drive. The first common mode choke is configured to suppress a ground current induced by the first variable speed drive.
    Type: Application
    Filed: September 20, 2019
    Publication date: March 26, 2020
    Inventor: Peter M. Dalton
  • GROUND FAULT DETECTION METHODS ON VARIABLE FREQUENCY DRIVE SYSTEMS
    Publication number: 20130257334
    Abstract: A mining machine including a motor, an adjustable speed drive providing a voltage to the motor, the voltage having an excitation component comprising a magnitude and a frequency for operating the motor at a desired speed and including an additional voltage component for use in detecting a ground fault condition, and a ground fault relay for detecting a ground fault current when the ground fault current exceeds a predetermined threshold.
    Type: Application
    Filed: March 15, 2013
    Publication date: October 3, 2013
    Inventors: Peter M. Dalton, Michael Jordan