Digital DC motor speed control circuit

Details Digital DC motor speed control circuit Digital DC motor speed control circuit

1979-04-23

1981-07-21

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318327, 318310, 318329, H02P 516

Patent

active

042800820

ABSTRACT:
A speed control circuit for a motor is responsive to variations in motor supply voltage and torque wherein a digital output indication of the actual speed of the motor is generated. The digital output is converted to an analog value and applied to a comparator which also receives the output voltage of a ramp circuit based on the motor supply voltage. The output of the comparator controls the width of the motor voltage pulses applied from a power amplifier to the motor in which the voltage pulses applied have proportionally larger width for a smaller level of motor supply voltages or decrease in the amount of motor shaft speed and proportionally narrow width pulses for increased levels of motor supply voltage or an increase in the amount of motor shaft speed. A one-shot network is provided for motor stall protection.

REFERENCES:
patent: 3355649 (1967-11-01), Boylan et al.
patent: 3409814 (1968-11-01), Azuma et al.
patent: 3596162 (1971-07-01), Takayama
patent: 3836756 (1974-09-01), Yamamoto et al.
patent: 4109184 (1978-08-01), Weber

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