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. 19, 2018
Filed:
May. 19, 2016
Applicant:
Canrig Drilling Technology Ltd., Houston, TX (US);
Inventors:
Gary Pace, Cypress, TX (US);
Kevin R. Williams, Cypress, TX (US);
James Garaghty, Houston, TX (US);
Brian Ellis, Houston, TX (US);
Assignee:
NABORS DRILLING TECHNOLOGIES USA, INC., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 19/084 (2006.01); H02K 1/27 (2006.01); H02K 1/30 (2006.01); B66D 1/12 (2006.01); E21B 19/00 (2006.01); E21B 19/09 (2006.01); H02K 1/32 (2006.01); E21B 15/02 (2006.01);
U.S. Cl.
CPC ...
H02K 1/30 (2013.01); B66D 1/12 (2013.01); E21B 19/006 (2013.01); E21B 19/008 (2013.01); E21B 19/084 (2013.01); E21B 19/09 (2013.01); H02K 1/2706 (2013.01); H02K 1/278 (2013.01); E21B 15/02 (2013.01); H02K 1/32 (2013.01);
Abstract
A low inertia permanent magnet motor includes a stator and rotor. The rotor includes a generally tubular and hollow rotor body coupled to the shaft of the motor by one or more spokes and/or webs. The permanent magnets of the rotor are coupled to the rotor body. In some embodiments, the low inertia permanent magnet motor may be used to power a drawworks. In some embodiments, the drawworks may be controlled by an active heave compensation controller.