DC Motor speed control circuit

Details DC Motor speed control circuit DC Motor speed control circuit

1977-05-25

1978-06-06

Smith, Jr., David

Electricity: motive power systems

Automatic and/or with time-delay means

Motor load, armature or primary or secondary circuit current

361 30, H01H 708

Patent

active

040939014

ABSTRACT:
A DC motor speed control circuit in which the current to the motor is delivered in a series of pulses the width of which is variable in accordance with the setting on a throttle control potentiometer. The pulses are shaped to provide a fast turn on and slow turn off of the control transistor to avoid heat build up and lessen the inductive kickback of the motor. A novel feedback circuit senses excessive current draw and automatically shuts down the circuit and remains latched in that condition until the throttle control potentiometer is reduced to zero whereupon the circuit automatically resets itself. High efficiency is achieved by directing both the power current and the control current through the motor windings thus increasing the battery life.

REFERENCES:
patent: 3383561 (1968-05-01), Thiele
patent: 3778694 (1973-12-01), Hubby et al.
patent: 3914675 (1975-10-01), Konrad
patent: 3931557 (1976-01-01), Osburn

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