As the width of ic555 output pulse is varied using potentiometer the firing angle of triac. This motor speed control circuit diagram contains few components such as.
The Triac Thyristors Electronics Textbook
Triac motor speed control circuit diagram. This simple triac speed control circuit is suitable for not only ac motor speed control but for lamp dimmers and electrical heater control and in fact is very similar to a triac light dimmer used in many homes. It is used in ac applications such as light dimming motor speed control etc. The motor speed control board also included in this article. This triac based 220v ac motor speed controller circuit is designed for controlling the speed of small household motors like drill machines. The triac is fabricated by integrating two thyristors in an inverse parallel connection. Diac triac phase angle control circuit it applies chopped ac waveform to motor and varies speed of ac motor.
The setting of p1 determines the phase of the trigger pulse that fires the triac. 01 uf 400v capacitor. However a commercial triac dimmer should not be used as a motor speed controller as generally triac light dimmers are intended to be. Ac input and output connector. If one is not familiar with diodes and ac rectification see the following. Triacs can also be used in micro controller power control with a phase synchronization circuit.
The speed of the motor can be controlled by changing the setting of p1. Varying speed of ac motor by means of changing firing angle of any thyristor is very widely used method. One very nice example is fan regulator in which a fan motor is 1 ac motor used and its speed is varied using diac triac method. You can able to access this free pcb layout without any cost. Here is a very simple example of ac motor speed control given by changing firing angle of triac with the help of micro controller 89c2051. So the circuit varies speed of ac motor by changing firing angle of triac by applying pwm generated using ic555 connected in monostable mode.
Gallery of Triac Motor Speed Control Circuit Diagram
