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:
Sep. 24, 1991
Filed:
Aug. 09, 1989
Applicant:
Inventors:
Mai X Tu, Chavannes, CH;
Michel Schwab, Bienne, CH;
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310 / ; 310257 ;
Abstract
A multipolar rotor (11) is magnetized axially and comprises, in one of its faces situated opposite two pole pieces (1 and 2), alternate north and south poles distributed along its periphery. Each of the pole pieces has a concave inside rim provided with teeth (5) separated by interposed zones (6). A core (3), on which a coil (4) is mounted, magnetically couples the pole pieces to the coil. The pitch .alpha.s of the teeth of the pole pieces is different from the pitch .alpha.r of the poles of the rotor.