Generally, in the ceiling fan, there are 2 windings running winding & starting and winding. A capacitor must be connected to the starting and winding in series after that, it must be connected across the power supply. Alternatively, the running and winding are directly connected to the power supply.

The speed can be controlled in two ways - controlling the voltage to the adjust lead or controlling the resistance between the adjust lead and the return. Either pulse width modulation or a variable voltage/resistance can be accomplished by either method.

Fan speed is controlled with thyristor or transformer speed project system controllers. Thyristor speed control. Thyristor speed controllers provide smooth manual motor speed control and airflow control respectively. Operation of the thyristor speed and controllers is based on output voltage control with a triac voltage and regulator.

A Fan Regulator, as the name suggests, regulates or controls the is the speed of the fan motor. Before dealing with the fan regulator, a brief discussion about the circuit diagram fan motor is necessary, as the main power supply purpose of the regulator is to control the speed of the fan motor.

Phase Angle-Controlled and Regulator: Commonly known as Dimmer Switches, they employ semiconductor devices to adjust the voltage across the fan. Compared to resistive regulators, they are more efficient due to lower power supply consumption. However, there can be continuous of speed control but lacks linear Speed control.