Speed Control Of Dc Motor Using Pwm Using 555 Timer
Consider a simple circuit as shown in figure below.
Speed control of dc motor using pwm using 555 timer. Building projects using small permanent magnet dc motor for cars robots quads requires a speed controllers to make them work flawlessly. A simple dc motor controller circuit using ne555 is shown here. The dc motor speed control circuit is primarily a 555 ic based pwm pulse width modulation circuit developed to get variable voltage over constant voltage. So now using the potentiometer we are able to control the speed of the dc motor or the pwm signal produces by the 555 timer ic.
In addition to controlling the motors speed its direction of rotation can be also changed using this circuit. Components required 555 timer ic 12v dc motor 1n5819 x 2 1n4007 100nf 100pf 10kω resistor. A more efficient way to proceed is by using pulse width modulation technique to control the speed of our dc motor. Circuit diagram of pwm based dc motor speed control.
I hope you enjoyed this tutorial and learned something new. This circuit uses similar pwm technique to control motor speed and uses ic 555 to generate pwm signals. Basic pwm motor speed control using 555 timer ics. A pwm circuit based on timer ne555 is the heart of this circuit.
This is the first part of supposed to be a two part instructable about speed control of a dc motor using 555 timer ics meant to cater those who are still starting to make electronics a hobby and beginners like me in a way. The speed of the dc motor is directly proportional to the voltage applied across its terminals. This project is designed to control the speed of a dc motor using pwm control using 555 ic. The method of pwm is explained here.
Hence if the voltage across the motor terminal is varied then the speed can also be varied. Here we are going to see how to control the speed of the small dc motor using 555 timer. In this part i will talk. For those who are not aware pwm or pulse width modulation is a modulation technique in where the width of the output pulse varies with with respect to time.
Also read the related post stepper motor controller using at89c51 microcontroller.