Micro stepping motor

Details Micro stepping motor Micro stepping motor

1979-06-13

1983-08-09

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310162, H02K 3700

Patent

active

043981070

ABSTRACT:
A micro stepping motor for use in compact electronic watches comprises a magnetic core, a coil winding wound on the magnetic core, and a one-piece stator connected to the magnetic core to define therewith a closed magnetic flux path. The stator has a necked portion defining a region of reduced cross-sectional area along its length, and a hole extends through the stator at the center of the necked portion. A rotor having at least one pair of magnetic poles is rotatably disposed within the stator hole with an air gap therebetween. The rotor rest positions are determined by either a pair of protrusions extending into the air gap at diametrically opposed sites about the stator hole, or a pair of recesses opening into the air gap at diametrically opposed sites about the stator hole.

REFERENCES:
patent: 3142774 (1964-07-01), Lundin
patent: 3626263 (1971-12-01), McBride
patent: 4103191 (1978-07-01), Kawamura et al.

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