Micro stepping motor for electronic watches

Details Micro stepping motor for electronic watches Micro stepping motor for electronic watches

1980-02-08

1982-11-30

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310162, 310193, H02K 3700

Patent

active

043617727

ABSTRACT:
A micro stepping motor for driving the hands of an analog electronic watch comprises a coil wound on a magnetic core, a magnetic stator connected to the core to define therewith a magnetic flux path, and a magnetized rotor rotatably disposed in an opening of the stator. The magnetic core has a higher saturated magnetic flux density and a smaller size than that of the magnetic stator thereby enabling construction of motors of smaller size and higher electric power efficiency than would otherwise be possible if the magnetic core and stator had the same value of saturated magnetic flux density.

REFERENCES:
patent: 2709762 (1955-05-01), Naul
patent: 2909685 (1959-10-01), Szabo
patent: 3142774 (1964-07-01), Lundin
patent: 4041336 (1977-08-01), Sudler et al.
patent: 4262223 (1981-04-01), Cleusix
patent: 4277704 (1981-07-01), Giger et al.

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