Question

what is the component used in fan regulator to regulate the speed of fan

Answer 1

 The parameters which can be used for speed control of fan are mainly

Frequency of supply : Fan speed is directly proportional to frequency. But it is not practical as the frequency of our home supply is fixed( 50 or 60 Hz). It is used rarely in industries where variable frequency supply systems are available.

Number of poles inside motor  : Think of it as the number of electromagnets inside the motor if you are unfamiliar with the term poles. No. of poles can be changed by changing the winding connections which is also not practical for our domestic fan control.

Voltage Control : This is the most popular method of speed control of induction motor driven fans. As the name suggests it controls the voltage appearing across  the fan terminals. Theoretically fan torque is proportional to square of voltage applied.  Popular three methods of voltage control are listed.

Answer 2

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TRIAC: TRIACs are the components used in controlling the AC signals. They are used in multiple applications where high-power switching is required in AC waveforms. TRIACs are generally used in AC dimmer circuits and come in very handy when trying to control the speed of a fan or as a dimmer to the LED bulb.

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