A DC Motor Driver is a device that drives motor, typically as a speed controller of motor. This DC Motor Driver circuit uses a 741 operational amplifier operating as a voltage follower where its non inverting input is connected to the speed and rotation direction of a potentiometer. When the potentiometer is turned towards the positive supply side, the output will go positive voltage and NPN transistor will supply the current to the motor and PNP transistor will be OFF. When the potentiometer is turned to the negative supply side, the op-amp output switches to the negative voltage and NPN Transistor will turn OFF and PNP Transistor ON which reverses the rotation of the motor's direction. It has been design along with Op-Amp to drive the motor. The fabrication results of DC Motor Driver provide very good results. The total cost of fabricated our dc motor driver using Op-Amp is comparatively cheaper than the traditional dc Motor Driver available in market price. A DC Motor specification is taken and corresponding parameters are found out from derived design approach. Ultimately simulation is done for model with and without filter used after reference speed and a comparative study has been done on response of both cases. Further it is purposed that in industrial environment these controllers are better than others controllers as Op-Amp controllers are easy and cheap.
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