Timepiece stepping motor drive circuit with stepping failure compensation

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 o...

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Bibliographische Detailangaben
Hauptverfasser:	KANNO, FUMIO
Format:	Patent
Sprache:	eng
Schlagworte:	CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY ELECTROMECHANICAL CLOCKS OR WATCHES GENERATION HOROLOGY PHYSICS
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Beschreibung
Zusammenfassung:	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.