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. 01, 2017
Filed:
Apr. 01, 2015
Applicant:
Canrig Drilling Technology Ltd., Houston, TX (US);
Inventor:
Gary Pace, Cypress, TX (US);
Assignee:
CANRIG DRILLING TECHNOLOGY LTD., Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 21/18 (2016.01); H02P 21/14 (2016.01); H02P 6/08 (2016.01); H02P 21/22 (2016.01);
U.S. Cl.
CPC ...
H02P 21/148 (2013.01); H02P 6/08 (2013.01); H02P 21/18 (2016.02); H02P 21/22 (2016.02);
Abstract
A method for limiting the torque of a permanent magnet AC motor includes a torque limit controller. The torque limit controller at least in part bases the torque limit on a selected direct voltage limit. The selected direct voltage limit may be used in combination with other torque limit conditions to generate the torque demand for the AC motor.