Speed Control of DC Motor using Microcontroller
- 1. Speed Control ofDC MotorUsingMicrocontroller Oral Presentation on Prepared By- 1. Snehasis Bhar (25301613072) 2. Soumya De (25301613076) 3. Sudip Mondal (25301613087) Sir J. C. Bose School of Engineering (Supreme knowledge Foundation group of Institutions) Mankundu ,Hooghly
- 2. INTRODUCTION The aim of developing this project is to control the speed of DC motor. The main advantage in using a DC motor is that the Speed- Torque relationship can be varied to almost any useful form. To achieve the speed control an electronic technique called Pulse Width Modulation is used which generates High and Low pulses. These pulses vary the speed in the motor. For the generation of these pulses a microcontroller (ATmega8) is used to set the speed ranges as per the requirement.
- 4. The electric and electromechanical methods are less adaptive so electronic techniques are used for speed control. One such technique is Pulse Width Modulation. We can easily apply this technique in Microcontroller using Aurdino. It is easy to compile program with this language.
- 10. • H – Bridge Circuit Diagram S1 __ S1 S2 __ S2 M + VCC Data S1 S2 00 OFF OFF 01 OFF ON 10 ON OFF 11 ON ON -
- 11. Pulse Width Modulation is a technique for getting analog results with digital means. Digital control is used to create a square wave. This on-off pattern can simulate voltages in between full on and off by changing the portion of the time the signal spends on versus the time that the signal spends off. The duration of "on time" is called the pulse width. To get varying analog values, you change that pulse width. The green lines represent a regular time period. Arduino's PWM frequency at about 500Hz, the green lines would measure 2 milliseconds each. A call to analogWrite() is on a scale of 0 - 255, such that analogWrite(255) requests a 100% duty cycle (always on), and analogWrite(127) is a 50% duty cycle (on half the time).
- 14. Microcontroller needs software like compiler to insert logics as inputs. It cannot interface high power devices directly. It is susceptible to EMI (Electromagnetic Interference), sometimes even produces audible noises. Speed control is little bit slow due to delay of clock pulse.
- 15. We wish to express our sincere gratitude to Ms. Srima Nandi, HOD of HU-Department for giving us such opportunity to do a project. We sincerely thank Mr. Vishwanath Gupta, Asst. Prof. of EE-Department for guidance and encouragement in carrying out this project work.