Micro stepping motor

Details Micro stepping motor Micro stepping motor

1977-01-21

1980-05-27

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 40MM, 310112, H02K 3700

Patent

active

042052440

ABSTRACT:
A micro stepping motor for use in compact watches and the like comprises a magnetic core, a coil winding wound on the magnetic core, and a stator formed as one rigid body and connected to the magnetic core to define therewith a closed magnetic flux path. The stator has a necked portion along its length and a hole extends through the stator at the center portion 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 position is determined by either a protrusion on the stator extending into the air gap forming a region of minimum reluctance or a recess in the stator opening into the air gap forming a region of maximum reluctance for the rotor flux.

REFERENCES:
patent: 1913179 (1933-06-01), Warren
patent: 2001914 (1935-05-01), Lenchan
patent: 3142774 (1964-07-01), Lundin
patent: 3370189 (1968-02-01), Haydon et al.
patent: 3818690 (1974-06-01), Schwarzschild
patent: 3979616 (1976-09-01), Stechmann
patent: 4041336 (1977-08-01), Sudler et al.

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