The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 2022
Filed:
Mar. 15, 2013
Applicant:
Joy Global Underground Mining Llc, Warrendale, PA (US);
Inventors:
Peter M. Dalton, New South Wales, AU;
Michael Jordan, Cranberry, PA (US);
Assignee:
Joy Global Underground Mining LLC, Warrendale, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 27/04 (2016.01); H02H 3/17 (2006.01); H02H 3/16 (2006.01);
U.S. Cl.
CPC ...
H02P 27/04 (2013.01); H02H 3/162 (2013.01); H02H 3/17 (2013.01); H02H 3/165 (2013.01);
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.