Timepiece stepping motor drive circuit with stepping failure com

Details Timepiece stepping motor drive circuit with stepping failure com Timepiece stepping motor drive circuit with stepping failure com

1981-04-30

1984-07-17

Roskoski, Bernard

Horology: time measuring systems or devices

Electrical time base

Solid state oscillating circuit type

368160, 318696, G04F 500

Patent

active

044602820

ABSTRACT:
In an electronic timepiece utilizing a stepping motor, voltage induced in the electromagnetic coil of the motor due to free oscillation of a rotor thereof is detected in a plurality of successive detection periods after application of a driving force to the motor is completed, and it is determined on the basis of such induced voltage for the respective detection periods whether the rotor failed to step or not. If the stepping failure is determined in at least one detection period, a compensation pulse is fed to the stepping motor to compensate for the stepping failure of the rotor and thereafter driving energy supplied to the electromagnetic coil of the motor is increased.

REFERENCES:
patent: 4321520 (1982-03-01), Ueda et al.
patent: 4326278 (1982-04-01), Shida et al.
patent: 4340946 (1982-07-01), Kanno et al.

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