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:
Apr. 12, 2016
Filed:
Feb. 25, 2014
Applicant:
Nidec SR Drives Ltd., North Yorkshire, GB;
Inventors:
Steven Paul Randall, Leeds, GB;
Mark John Cherney, Potosi, WI (US);
Assignee:
NIDEC SR DRIVES, LTD, Harrogate, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 6/14 (2006.01); H02P 23/00 (2006.01); H02P 7/298 (2006.01);
U.S. Cl.
CPC ...
H02P 23/004 (2013.01); H02P 7/298 (2013.01); H02P 23/0036 (2013.01);
Abstract
A brushless electrical machine has at least one phase winding which produces torque to drive a load. The control system for the machine is able to vary the flux and current supplied to a phase so as to vary the torque output as a function of the rotor position. The energization is reduced at particular angles to produce a dip in the torque profile, thus ensuring that, if the drive stalls, it does so at a predetermined position, for example where the losses in the drive are minimized.