Permanent magnet step motor with a shiftable rotor

Details Permanent magnet step motor with a shiftable rotor Permanent magnet step motor with a shiftable rotor

1979-07-20

1981-04-07

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Rotary

308 10, 310 90, 310156, 310157, 310191, 310254, H02K 3700

Patent

active

042609151

ABSTRACT:
A step motor for an electronic wristwatch is provided wherein the load on the rotor is reduced. The reduction in the load on the rotor is provided by the configuration of a rotor pinion supporting the rotor and the manner in which same is supported by the rotor support assembly. The rotor pinion includes first and second trunions respectively disposed in first and second bearings. The rotor pinion includes first and second shoulders axially recessed from the ends of the trunions by a predetermined distance so as to define a clearance between the respective shoulders and the respective bearings for each rotary position of the rotor.

REFERENCES:
patent: 3539845 (1970-11-01), Stcherbatcheff
patent: 3873865 (1975-03-01), Preiser et al.
patent: 4079274 (1978-03-01), Richmond
patent: 4126796 (1978-11-01), Ito

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