Analog electronic timepiece

Details Analog electronic timepiece Analog electronic timepiece

1982-05-06

1984-10-16

Miska, Vit W.

Horology: time measuring systems or devices

Electrical time base

Solid state oscillating circuit type

368 76, G04F 500, G04B 1900

Patent

active

044771967

ABSTRACT:
A stepper rotor is driven with a narrow pulse width input which matches the load conditions on the motor. The subsequent position of the rotor is detected as being rotated or non-rotated by application of a detection pulse to the rotor. An additional driving pulse of increased width is applied should the rotor be found in a non-rotated state. A stabilizing pulse prevents intermediate rotor positioning. Position of the stepper motor is detected by passing a current through the rotor cell. The rate of increase in detection current is different when the rotor has rotated and when the rotor does not rotate because coil inductance and magnetic flux directions passing through the saturable portion of the stator are different depending upon the position of the rotor. The width of the driving pulse for normal operation is selected from a range of pulse widths so as to match the load on the motor.

REFERENCES:
patent: 4048548 (1977-09-01), Nakajima et al.
patent: 4055785 (1977-10-01), Nakajima et al.
patent: 4312059 (1982-01-01), Mandai et al.
patent: 4368990 (1983-01-01), Ueda et al.

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