Horology: time measuring systems or devices – Regulating means – For compensation
Patent
1978-04-20
1980-05-27
Truhe, J. V.
Horology: time measuring systems or devices
Regulating means
For compensation
368155, G04C 300
Patent
active
042043972
ABSTRACT:
An electronic timepiece reduces power consumption by normally driving the stepping motor with a short pulse and driving the motor with a wide pulse under heavy load conditions by sensing the rotor position. A detection circuit senses the voltage drop across a detection element in series with the motor coil for driving a first detection pulse and senses again for driving a second detection pulse. If the second voltage drop is larger, then the rotor is not rotating whereupon the wide pulse is used to drive the motor.
REFERENCES:
patent: 4150536 (1979-04-01), Nakajima
Asano Kazuhiro
Mandai Masaaki
Satoh Katsuhiko
Shida Masaharu
Torisawa Akira
Adams Bruce L.
Burns Robert E.
Kabushiki Kaisha Daini Seikosha
Lobato Emmanuel J.
Pojunas, Jr. Leonard W.
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