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:
May. 17, 2011
Filed:
Jul. 31, 2008
Applicants:
Jingbo Liu, Grafton, WI (US);
Thomas Nondahl, Wauwatosa, WI (US);
Peter Schmidt, Franklin, WI (US);
Semyon Royak, Beachwood, OH (US);
Mark Harbaugh, Richfield, OH (US);
Inventors:
Jingbo Liu, Grafton, WI (US);
Thomas Nondahl, Wauwatosa, WI (US);
Peter Schmidt, Franklin, WI (US);
Semyon Royak, Beachwood, OH (US);
Mark Harbaugh, Richfield, OH (US);
Assignee:
Rockwell Automation Technologies, Inc., Mayfield Heights, OH (US);
Primary Examiner:
Int. Cl.
CPC ...
H02P 1/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method and apparatus for determining rotor position in a stationary rotor of a sensor-less permanent magnet synchronous machine that employs a rotating magnetic field to identify a magnetic axis of the stator without a magnetic direction and then determines magnetic direction by applying pulses along the magnet axis in two polarities.