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. 24, 2005
Filed:
Mar. 26, 2001
C. Theodore Peachee, St. Louis, MO (US);
Donald J. Williams, Pierron, IL (US);
James A. Wafer, Belleville, IL (US);
Marielle Piron, Harrogate, GB;
Steven P. Randall, Leeds, GB;
Richard S. Wallace, Jr., Ferguson, MO (US);
Michael L. Mcclelland, Leeds, GB;
C. Theodore Peachee, St. Louis, MO (US);
Donald J. Williams, Pierron, IL (US);
James A. Wafer, Belleville, IL (US);
Marielle Piron, Harrogate, GB;
Steven P. Randall, Leeds, GB;
Richard S. Wallace, Jr., Ferguson, MO (US);
Michael L. McClelland, Leeds, GB;
Emerson Electric Co., St. Louis, MO (US);
Abstract
A sensorless switched reluctance machine includes a stator with a plurality of circumferentially-spaced stator segment assemblies that include salient stator poles and inter-polar stator slots. Each of the stator segment assemblies includes a stack of stator plates forming a stator segment core, an end cap assembly, and winding wire wound around the stator segment core and the end cap assembly. The rotor defines a plurality of rotor poles. The rotor tends to rotate relative to the stator to a rotational position that maximizes the inductance of an energized winding. A sensorless drive circuit derives rotor position and energizes the winding wire around the stator segment assemblies based on the derived rotor position. Each stator plate includes a first radially outer rim section and a tooth section that extends radially inwardly from a first center portion of the first radially outer rim section.