Stepping motor for timekeeping mechanism

Details Stepping motor for timekeeping mechanism Stepping motor for timekeeping mechanism

1977-02-18

1978-05-09

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310163, H02K 3700

Patent

active

040889092

ABSTRACT:
A stepping motor includes a rotor formed of ferromagnetic material having a plurality of circumferentially alternately arranged poles of opposite polarities and a stator having main poles which are polarized in opposite polarities by successive drive pulses of opposite senses. An auxiliary stator pole is provided between adjacent main stator poles to give rise to a thrust that causes the rotor to rotate a small angle in the direction of rotation during the interval between successive drive pulses so that upon polarization of the stator by a subsequent drive pulse the rotor is easily caused to rotate in the same direction of rotation.

REFERENCES:
patent: 2122374 (1938-06-01), Kohlhagen
patent: 2864018 (1958-12-01), Aeschmann
patent: 3435311 (1969-03-01), Matsuzawa et al.
patent: 3597915 (1971-08-01), Aizawa et al.
patent: 3626263 (1971-12-01), McBride
patent: 3818690 (1974-06-01), Schwarzschild
patent: 3949251 (1976-04-01), Takatsuki
patent: 3989967 (1976-11-01), Kikuyama et al.

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