Four Quadrant DC Motor Speed Control with Microcontroller


Uploaded on May 02, 2012 by Efxkits

The aim of this project is four quadrant speed control of the DC motor. The motor is operated in four quadrants viz, clockwise; counter clock-wise, instantaneous forward brake and instantaneous reverse brake. The speed of DC motor is directly proportional to the DC voltage applied across its terminals. Hence, if we control the voltage applied across its terminal, we actually can control its speed. Instantaneous brake happens as a result of applying a reverse voltage across the running motor for a brief period.

Here we use microcontroller from 8051 family. Push buttons are used as inputs to control the motor speed, to change direction and also to apply brakes to the motor. PWM is generated at the output by using program burned onto the microcontroller. The program is written in Embedded C. PWM (Pulse Width Modulation) wave can be used to control the speed of the motor. Here the average voltage given or the average current flowing through the motor will change depending on the ON and OFF time of the pulses controlling the speed of the motor i.e., the duty cycle of the wave controls its speed. The motor is interfaced to the microcontroller by a motor driver IC.

The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components.project works, final year project, embedded systems, latest embedded projects, embedded seminar topics, non conventional projects, gsm based projects, microcontroller based projects india, hyderabad ieee projects, embedded seminar topics, robotics projects, 8051 micro controller projects, robotic kits manufacturers, embedded projects, robotics kit, ieee based projects, eee projects

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