Digital dc motor speed control circuit

Details Digital dc motor speed control circuit Digital dc motor speed control circuit

H - Electricity

02

P

318/93

H02P 7/28 (2006.01) H02P 7/288 (2006.01) H02P 23/00 (2006.01)

Patent

CA 1171132

Abstract of the Disclosure A speed control circuit for a motor is res- ponsive 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 pro- portionally 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 in- crease in the amount of motor shaft speed. A one shot network is provided for motor stall protection.

347874

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