Hello everyone, today I will share with you the circuit principle of the electric fan around us. The following is an explanation with the circuit diagram.

         As can be seen from the figure above, this circuit can be divided into three parts: the 220V AC power supply circuit on the far left, the swing circuit in the middle, and the fan circuit on the far right. The electric fan motor is a single-phase AC motor, which has two windings inside, one is called the running winding (also called the main winding), and the other is called the starting winding (also called the auxiliary winding). The starting circuit is composed of phase-splitting capacitors, so that the main and auxiliary windings are separated by 90° electrical angle in space. The speed control circuit is composed of a reactor speed control switch in series, and the speed control is achieved by adjusting the size of the reactor to change the voltage of the motor. After understanding this circuit diagram, it is enough to repair the electric fan.