Motor for electronic watch

Details Motor for electronic watch Motor for electronic watch

1978-12-04

1981-07-07

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310162, 368 76, H02K 3700

Patent

active

042777046

ABSTRACT:
A stepping motor particularly intended for electronic watches comprises two poles connected to a core bearing an elongated coil. The poles are joined at nose portions thereof by interposed elements of a material having a magnetic permeability as close as possible to 1. The one-piece stator may be formed by blanking from a composite band, thus considerably simplifying the problem of positioning the poles of the stator relative to the plate of the watch movement and to the rotor. A method of fabricating the one-piece stators efficiently consists in rolling together two strips of ferromagnetic metal and an interposed fillet of non-magnetic metal, these elements being joined at their edges to form a composite band from which the stators are blanked.

REFERENCES:
patent: 2121699 (1938-06-01), Janzen
patent: 2804680 (1957-09-01), Flagg, Jr.
patent: 3142774 (1964-07-01), Lundin
patent: 3949251 (1976-04-01), Takatsuki
patent: 4066947 (1978-01-01), Nakajima et al.

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