Control circuit for a stepping motor in battery-operated instrum

Details Control circuit for a stepping motor in battery-operated instrum Control circuit for a stepping motor in battery-operated instrum

1980-11-06

1983-04-26

Smith, Jr., David

Electricity: motive power systems

Open-loop stepping motor control systems

318685, 368157, H02K 3700

Patent

active

043814816

ABSTRACT:
In a circuit for the actuation of a stepping motor for battery-operated instruments, in particular watches, the length of motor drive pulses is altered for the purpose of saving energy. In the process, different loads on the stepping motor and variable battery voltages are taken into consideration. This feature is accomplished by measuring a signal proportional to the current flowing through the field coil of the stepping motor and interrupting the drive pulse to the motor when a predetermined change occurs in the signal. The drive pulses are further limited as to both minimum and maximum length. Advantageously, the stepping motor is actuated and the signal processed by means of a digital circuit technology, in order to provide for complete integration of the circuit.

REFERENCES:
patent: 4192131 (1980-03-01), Hosokawa et al.
patent: 4212156 (1980-07-01), Kawamura et al.
patent: 4312059 (1982-01-01), Mandai et al.
patent: 4326278 (1982-04-01), Shida et al.

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