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Insight - How Fan Regulators work

Table of Contents:

Written By: 

Arpit Jain


Fan regulators have an important place in the electrical switch boards. Fan regulators are very similar to light dimmers.Their function is to regulate/control the speed of the fan and provide a convenient environment for the residents. 
The traditional regulators which are bulky use a resistance having taps and connected in series with the fan. When we move the knob different amount of resistance gets inserted in the circuit. Although cheap the biggest problem with such a regulator is that a considerable amount of energy is lost in form of heat through the resistance. When the fan is operating at low speed the power loss is significant.
The technologically superior electronic regulators overcome these problems by using electronic components to control the speed of the fan.
Some of the advantages of electronic fan regulators are:
1.      They provide a continuous speed control.
2.      Power saving at all the speeds.
3.      Smaller size and weight.
The heart of the electronic fan regulator is TRIAC. TRIAC is a semiconductor device belonging to the family of thyristors. 
Fan Regulator

The above images show the front and back images of an electronic fan regulator. Once again it is available is a variety of shape, size, color depending on manufacturer to manufacturer.


thank you 


i want the circuit diagram of regulator

i want circuit diagrame of fan regulater using Traic

please give circuit diagram.


Hey i want Ckt diagram & also some explanation


Though advantages about electronic fan controllers are listed, I find that the speed variation between max(5) position and the next (Position 4) is very significant. Positions 3-2 show no change to 4. In Position 1 fan does not work at all. what is this functionality? How to make a perfect regulator?. Please explain

Nice question! 

Even I have observed the same behavior with smaller regulators (single module; the one shown in the pic). If you buy the double-module regulator then you'll find the speed increments to be smoother. Moreover, I was told by the dealer that these small regulators do not really save any energy. Bigger ones do. I have to check his claim though, with a power meter.





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