Electromechanical watch movement

Details Electromechanical watch movement Electromechanical watch movement

1975-04-15

1976-12-28

Weldon, Ulysses

Electrical generator or motor structure

Dynamoelectric

Rotary

58 28R, 58116R, 310 36, G04C 300

Patent

active

039993698

ABSTRACT:
A low-cost electromechanical watch movement comprises a step-by-step motor including a multipolar rotor mounted for rotation within an encased stator and carrying driving pallets operatively engaging with a time-display gear train. The stator and rotor each have a like number of alternate pole pieces disposed on arcuate surfaces concentric to the axis of the rotor and separated radially by arcuate air-gaps of constant section. Small circumferential air-gaps separate the pole-pieces of the stator and, possibly, the rotor. The pole pieces of the rotor are permanently magnetized and those of the stator electromagnetically energizable by a winding supplied with periodic electric pulses from a pulse generator to drive the rotor through an angle less than 15.degree. in response to a pulse. A spring lightly biases the rotor to its initial position. In the absence of a current pulse, the total permeance of the air gaps produced by the permanent magnetization remains substantially constant whereby during return of the rotor by the biasing spring no retaining torque is produced by magnetic attraction.

REFERENCES:
patent: 3196603 (1965-07-01), Reich
patent: 3238399 (1966-03-01), Croymans et al.
patent: 3435311 (1969-03-01), Matsuzawa et al.
patent: 3506897 (1970-04-01), Clifford
patent: 3541778 (1970-11-01), Ingenito et al.
patent: 3587223 (1971-06-01), Zatsky
patent: 3604201 (1971-09-01), Dome
patent: 3737746 (1973-06-01), Cielaszyk et al.
patent: 3816779 (1974-06-01), Lundin
patent: 3844104 (1974-10-01), Schlicht

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