Motor speed control device

Details Motor speed control device Motor speed control device

1994-11-21

1996-04-23

Ip, Paul

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

318270, 388809, 388813, H02P 540, G03B 1700

Patent

active

055106838

ABSTRACT:
A motor speed control device, preferably for use in a camera, controls a motor to rotate at a constant speed in accordance with a pulsed signal output from a motor speed detector, such as a photointerrupter. To overcome the control problems that occur when the motor abnormally stops rotating, preventing generation of pulsed, the motor speed control device includes a timer that measures elapsed time from a most recent pulse. When the elapsed time exceeds a predetermined value, the motor speed control device accelerates the motor so that control of the motor at a constant speed can continue.

REFERENCES:
patent: 5023648 (1991-06-01), Meguro et al.

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