Step-by-step miniature motor for watch movement

Details Step-by-step miniature motor for watch movement Step-by-step miniature motor for watch movement

1980-09-08

1982-08-03

Miller, J. D.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 40MM, 310156, 310162, H02K 3700

Patent

active

043429300

ABSTRACT:
The present invention concerns a miniature stepping motor 10 for a watch movement comprising a rotor 12 and a stator 11 pierced with a circular opening in which the rotor is located. A reinforcing band 18 surrounds the rotor concentrically and is pressed into the circular opening of the stator. This band 18 consists of a hollow cylindrical part 19 and an annular part 20 which closes at least partially the tubular piece constituting the band 18. A central opening in the annular part 20 provides a housing for the bearing 16 of the rotor axle.
This band ensures a double function: that of making the stator rigid and that of centering the rotor.

REFERENCES:
patent: 3949251 (1976-04-01), Takatsuki
patent: 4006375 (1977-02-01), Lyman et al.
patent: 4185214 (1980-01-01), Gerber et al.
patent: 4201929 (1980-05-01), Sudler et al.
patent: 4206375 (1980-06-01), Sudler

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