Driving device of stepping motor

Details Driving device of stepping motor Driving device of stepping motor

1981-12-03

1985-05-21

Witkowski, Stanley J.

Electricity: motive power systems

Open-loop stepping motor control systems

368 86, 368218, G04B 1900, G04C 300, G05B 1940

Patent

active

045189064

ABSTRACT:
A driving device of a stepping motor comprises a driver/detector circuit for detecting whether a rotor has rotated or not by comparing a voltage induced across a driving coil by the free oscillation of the rotor with a reference voltage after a driving pulse is cut off and a control circuit automatically varies the pulse width of the driving pulse in response to an output of the driver/detector circuit. The control circuit includes circuitry for lowering the reference voltage when the pulse width of the driving pulse is lengthened thereby enabling use of a wider range of driving pulse widths than would otherwise be possible.

REFERENCES:
patent: 4219999 (1980-09-01), Ichikawa
patent: 4283783 (1981-08-01), Nakajima
patent: 4321521 (1982-03-01), Ueda
patent: 4326278 (1982-04-01), Shida

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