Microcontroller Based Closed Loop Speed and Position Control of DC Motor

Abstract — Direct current (DC) motor has become an important drive configuration for many applications across a wide range of powers and speeds, due to its easy control and excellent performance. This project is mainly concerned on design and implementation of bidirectional dc motor speed and position control system by using microcontroller ATMEGA32 and Lab VIEW software. It is a closed-loop real time control system, where optical encoder is coupled to the motor shaft to provide the feedback speed signal and angular position of shaft to the microcontroller. Pulse Width Modulation (PWM) technique is used which is generated using microcontroller Atmega32 the PWM signal generated will drive the motor driver circuit. By varying the duty cycle the voltage across the motor is varied. Lab VIEW software is used to provide a graphic user interface (GUI) for the user to enter desired speed or desired angle. From the hardware results it is observed that the speed of dc motor remains constant irrespective of the load across it. The angular position control was on par with the desired values