Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1979-12-04
1982-03-23
Truhe, J. V.
Electricity: motive power systems
Open-loop stepping motor control systems
318647, 368202, 368204, 368 11, G05B 1940
Patent
active
043215211
ABSTRACT:
An electronic timepiece has a stepping motor comprised of a stator, rotor and driving coil. A wave shaping circuit produces normal driving pulses and correction driving pulses having a longer pulse width than the normal driving pulses. A rotor rotation detection device detects rotation and non-rotation of the rotor after normal driving pulses are applied to the driving coil and in response to detection of a non-rotation condition, a correction driving pulse is applied to the driving coil. A magnetic field detection device detects the presence and absence of an external alternating magnetic field and in response to detection of a magnetic field, a driving pulse of longer pulse width than the correction driving pulses is applied to the driving coil to effect rotor rotation. The magnetic field detection device operates before the normal driving pulses are applied to the driving coil so that in the event of detection of a magnetic field, a driving pulse of sufficiently long pulse width will be applied to the driving coil to effect rotor rotation. In response to detection of an external alternating magnetic field by the magnetic field detection device, operation of the rotor rotation detection device is inhibited thereby conserving power and preventing mis-operation of the stepping motor.
REFERENCES:
patent: 3756010 (1973-09-01), Kimura et al.
patent: 3963946 (1976-06-01), Zajac
patent: 4081736 (1978-03-01), Leenhouts
patent: 4158287 (1979-06-01), Nakajima et al.
patent: 4192131 (1980-03-01), Hosokawa et al.
Mandai Masaaki
Otawa Shuji
Sato Katsuhiko
Shida Masaharu
Torisawa Akira
Adams Bruce L.
Burns Robert E.
Indyk Eugene S.
Kabushiki Kaisha Daini Seikosha
Lobato Emmanuel J.
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