The fan has an AC motor. Now, when a capacitor is added to the additional auxiliary winding of the stator, a field is created which goes 90 degrees to the main winding field, so we get two fields that are 90 degrees to each other, resulting in a spin field that is responsible for starting the main winding field Fan motor is responsible.
In a nutshell, a capacitor acts like another phase for the single-phase motor, including those in your fan. It divides the current into different phases so that a sufficient phase difference can be present to generate a magnetic torque.
Why is a capacitor used in a fan?
Main Reason is, Single-phase motors do not start by themselves, so the fan does not turn. The capacitor has leading PF. That is +90 degrees before the phase voltage. Due to the capacitor, the single phase is divided into two phases. This phase difference is used to make the fan rotate
In fact, when an induction motor is powered single-phase. The amount of torque produced is finite, but the total is zero. The fan has two windings, one starts winding, the other one is winding. Thus, two torques are generated with one of the torques trying to move the fan in the forward direction and the other trying to rotate the fan in the reverse direction, and since both torques are the same, they cancel out the effect of the other.
To solve this problem, we use a concept called a phase split. Which means that a capacitor is connected between both windings, i. H. Start and running windings. So think, if a capacitor is connected between them, the flux they generate will have a phase difference that will certainly produce a torque. This is the main reason.
The magnetic field generated by the single-phase supply is unable to produce a non-zero net torque in a single-phase induction motor, so that using a capacitor, a phase separation occurs from a non-zero net torque.