Drive control system for stepping motor

Details Drive control system for stepping motor Drive control system for stepping motor

1979-11-21

1981-08-11

Miska, Vit W.

Horology: time measuring systems or devices

Chronological

With mechanical or electromechanical driven display

368218, 318696, G04B 1900, G04C 300, G05B 1940

Patent

active

042837839

ABSTRACT:
In an electronic timepiece having a stepping motor which drives time indicating means, a system is provided for detecting an increase in the load torque on the stepping motor above a predetermined level. When such an increase is detected, the conditions for detection of the load on the stepping motor are changed, and thereafter drive pulses of increased power are applied to the stepping motor. When the increased load is removed, this is detected under the new set of detection conditions, and a return to the original detection conditions is executed, with the drive pulse power being returned to the original level. Stability of control is thereby provided, together with immediate response to increased load on the stepping motor.

REFERENCES:
patent: 3812670 (1974-05-01), Nikaido et al.
patent: 4031448 (1977-06-01), Adachi
patent: 4032827 (1977-06-01), Dobkatz
patent: 4204397 (1980-05-01), Asano et al.
patent: 4209971 (1980-07-01), Ueda et al.
patent: 4217751 (1980-08-01), Torisawa et al.

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