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US 2024/0402652 A1Published application
Analog electronic timepiece
OwnerNorio MIYAUCHIinventor
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OwnerNorio MIYAUCHIinventor
Estimating the term…
A sweep motion second function is added to an analog electronic timepiece. Angular velocity control of a stepping motor for a seconds hand in which a rotor is provided is executed. A stepping motor model calculates an equation of motion and a circuit equation regarding the stepping motor in real time. Sweep drive is executed with a sweep drive pulse width generated through performing a proportional integral of the difference between angular velocity set to π (radians/second) and angular velocity of the stepping motor model. Correction of the load torque is executed using the rotor angle at the zero crossing of a back electromotive voltage generated across a coil of the stepping motor and the calculated angular velocity. A DC current is applied to coils disposed at bridges of a yoke and the detent torque of the stepping motor is reduced. Time lag is corrected using a GPS time signal.
An analog electronic timepiece that has a step motion second function and a sweep motion second function, and executes step drive and sweep drive of a stepping motor configured from a rotor formed of a permanent magnet with two poles and a stator including a monolithic plate-shaped yoke having a rotor hole that the rotor enters, the yoke being magnetically coupled to the rotor, and a coil fixed to the yoke, wherein
Dependencies are inferred from the claim text.