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:
Feb. 15, 2000
Filed:
Dec. 08, 1995
Sergei F Kolomeitsev, Sylvania, OH (US);
Dana Corporation, Toledo, OH (US);
Abstract
A variable reluctance electric motor includes a hollow cylindrical stator having a plurality of radially inwardly extending poles. Each of the stator poles is generally rectangular in cross sectional shape and is bifurcated into two stator teeth at its radially innermost end by a central, longitudinally extending slot. The outer circumferential edges of the stator pole teeth are beveled at their respective junctions with the sides of the stator pole. A stator pole gap width is defined between adjacent stator poles. A slot width is defined within each of the stator poles between the adjacent longitudinally extending edges of the slot. The ratio of the stator pole gap width to the stator pole slot width is in the range of from about 1.8 to about 2.3. A cylindrical rotor is co-axially supported within the stator for relative rotational movement. The rotor has a plurality of radially outwardly extending poles formed thereon. Each of the rotor poles is generally rectangular in cross sectional shape. The outer circumferential edges of the rotor poles are beveled at their respective junctions with the sides of the rotor pole to provide a tapered end. Each of the rotor poles defines a width which is measured at the outer circumferential surface thereof, extending between the two beveled edges. The rotor poles also defines a pitch which is measured from one point on a first rotor pole to the same point on the adjacent rotor pole. The ratio of the rotor pole width to the rotor pole pitch is in the range of from about 0.40 to about 0.47. Preferably, a motor having N stator poles will have 2.multidot.N stator pole teeth, and a rotor employed in such a motor 20 will have (2.multidot.N)+2 rotor poles.