Speed Control Of Dc Motor Using Microcontroller And PIC

Abstract

The Microcontroller based adjustable closed-loop DC motor speed controller systems has already become an important drive con guration for many applications across a wide range of powers and speeds . This is due to their simple control, high reliability, low cost and fast response. Control System Design and Analysis technologies are widely suppress and very useful to be applied in real-time development. Some can be solved by hardware technology and by the advance used of software, control system are analyzed easily. Fractional HP DC Motors can be used in various applications and can be used as various sizes and rates. The designed circuit is stimulated using Real peak simulator,PSIM and MP LAB. It is a closed-loop real time control system, where optical encoder (built in this project) is coupled to the motor shaft to provide the feedback speed signal to controller. Pulse Width Modulation (PWM) technique is used where its signal is generated in microcontroller. Microcontroller acts as pro- portional (P) controller with Kp =1 in this project. The PWM signal will send to motor driver to vary the voltage supply to motor to maintain at constant speed. A program in C developed to provide a graphic user interface (GUI) for the user to enter desired speed through push button switches . Besides, it also shows a graph of motor speed versus time to let the user monitor the performance of the system easily. Based on the result, the reading of optical encoder built is quite reliable.