Stepping motor for timepiece

Details Stepping motor for timepiece Stepping motor for timepiece

1991-03-19

1992-06-23

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 40MM, 310162, H02K 3700

Patent

active

051245990

ABSTRACT:
A stepping motor for a timepiece has a coil (12), a single magnetic circuit, two stator pole pieces (10a, 10b), and two rotors in the form of axially magnetized permanent-magnet disks (13, 14). The two rotors are coaxial and disposed one on each side of a plane defined by the stator pole pieces defining gaps of different widths (.delta.1, .delta.2) between adjacent facing surfaces of said respective disks and said stator pole pieces.

REFERENCES:
patent: 3922574 (1975-11-01), Whiteley
patent: 4477759 (1984-10-01), Guerin et al.
patent: 4644207 (1987-02-01), Catterfield et al.
patent: 4713565 (1987-12-01), Grosjean
patent: 4912832 (1990-04-01), Egger et al.

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