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:
Aug. 09, 2016
Filed:
Jul. 28, 2014
Applicant:
Electronic Power Design, Inc., Houston, TX (US);
Inventor:
Charles Sutherland, Houston, TX (US);
Assignee:
Electronic Power Design, Inc., North Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P 27/04 (2016.01); B66C 13/18 (2006.01); B66C 13/22 (2006.01); H02P 3/12 (2006.01); G05B 15/02 (2006.01); B66C 13/14 (2006.01); B66C 23/16 (2006.01); B66C 23/88 (2006.01);
U.S. Cl.
CPC ...
B66C 13/18 (2013.01); B66C 13/14 (2013.01); B66C 13/22 (2013.01); B66C 23/16 (2013.01); B66C 23/88 (2013.01); G05B 15/02 (2013.01); H02P 3/12 (2013.01);
Abstract
A method and apparatus are disclosed for lowering a load on a direct current hoist motor during an electrical power interruption, the method including but not limited to determining in a crane processor that the electrical power interruption has occurred; and providing a brake assist current to shunt field on the direct current hoist motor to produce a counter torque in the hoist motor.