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:
Jun. 29, 1999
Filed:
Nov. 20, 1997
Daho Taghezout, Morges, CH;
Eta SA Fabriques d'Ebauches, Grenchen, CH;
Abstract
The motor (1) includes three stator parts (11, 12, 13) and two coaxial rotors (2, 3) each including a multipolar magnet having axial magnetization (4, 5) arranged between the third (13) and the first (11) respectively the second stator poles (12). The latter each comprises two stator poles (15, 16, 22, 23) having a plurality of teeth (19, 20, 26, 27) staggered with respect to one another. In the rest positions of the rotors (2, 3) the magnetic dipoles (6) of their magnets (4, 5) are phase-shifted with respect to the respective teeth (19, 20, 26, 27). Two coils (51, 52) are each coupled to a stator pole (15, 22), a third coil (53) is coupled to the other two stator poles (16, 23). As result of this arrangement, the motor (1) is compact and its rotors (2, 3) are able to rotate in both directions independently of each other.