Electromagnetic micromotor for use in watch movements of small d

Details Electromagnetic micromotor for use in watch movements of small d Electromagnetic micromotor for use in watch movements of small d

1991-02-15

1993-04-27

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 43, 310 89, H02K 710, H02K 502, H02K 504

Patent

active

052065545

ABSTRACT:
The invention concerns an electromagnetic micromotor. Such micromotor includes a rotor constituted by a permanent magnet (52) partially embedded in an overmolding (54) formed from plastic material and which is provided with coupling means to a driven mechanism, a cage (60) including a bottom and a cover and intended to be engaged in the interior of a stator while the rotor is mounted for free rotation in the cage, and rotation guide means for the rotor (50) in the cage (60), such micromotor being characterized in that the rotation guide means are constituted, on the one hand, by two housings (74, 76) coaxially arranged in the overmolding (54), and on the other hand, by two spindles (78, 80) respectively integral with the bottom and the cover of the cage and intended to be accommodated respectively in one of these housings. Such micromotor is intended to equip timepiece movements of very small dimensions, for instance for ladies' watches.

REFERENCES:
patent: 3390289 (1968-06-01), Dijken et al.
patent: 4126933 (1978-11-01), Anderson et al.
patent: 4318017 (1982-03-01), Migeon et al.
patent: 4412144 (1983-10-01), Denison et al.
patent: 4484094 (1984-11-01), Ade et al.
patent: 4931679 (1990-06-01), Fournier

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