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:
Jun. 28, 2016
Filed:
Nov. 11, 2014
Applicant:
Canrig Drilling Technologiy Ltd., Houston, TX (US);
Inventor:
Gary Pace, Cypress, TX (US);
Assignee:
CANRIG DRILLING TECHNOLOGY, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P 6/08 (2006.01); H02P 23/14 (2006.01); H02P 21/00 (2016.01);
U.S. Cl.
CPC ...
H02P 21/0089 (2013.01);
Abstract
A method for field weakening control of a three phase permanent magnet AC motor in a VFD drive. The VFD drive calculates the three phase voltages to be supplied to the AC motor via a three phase inverter using feedback and feed-forward calculations of quadrature and direct demand currents.