Abstract: The present invention concerns a micromotor for an indicator device comprising a hand of the type generally used in the instrument panels of motor vehicles. More specifically, the present invention concerns a micromotor of this type comprising a case wherein the thickness of one area is smaller than its maximum thickness, so as to form a free space or recess open on the exterior, in particular on the bottom of the case. This recess can be advantageously used for arranging components necessary for the operation of the instrument panel in which the micromotor is mounted, thereby saving space with respect to devices of the prior art.
Type:
Grant
Filed:
September 1, 2004
Date of Patent:
April 21, 2009
Assignee:
Microcomponents SA
Inventors:
Marc Vuilliomenet, Albert Pages, Gérard Jacob, Andreas Hirt
Abstract: The two phase motor of small size is formed by a stator comprising principal magnetic poles (8, 10, 12) arranged in the same general plane and by a rotor provided with a bipolar permanent magnet (6). The first and second principal poles are connected to the third principal pole by two magnetic cores respectively, each carrying one of two windings (20, 22). The third principal pole (12) defines to adjacent secondary poles (26, 28) separated from one another by a region (30) of high magnetic reluctance. The first and second principal poles (8, 10) and the two secondary poles (26, 28) are distributed in four sectors of a circle of around 90° around the stator aperture (40). The invention also concerns a method of making the stator of a motor of the type described above.