Question

Why Capacitor is used in a Fan?

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Solution

Capacitor:A capacitor is a device for storing electrical energy that consists of two insulated conductors in close proximity. The parallel-plate capacitor is a simple example of such a storage device.Use of capacitor in Fan:The electrical fan's circuitry consists of one switch, one beginning winding and one running winding and stator, one capacitor serially coupled with the starting winding and one rotor.Below is a circuital arrangement of a non-capacitor electrical fan. When the switch is closed,$230\mathrm{V}$ A.C. enters the circuit, and the same phase enters the starting and running windings. There is no magnetic rotation when two windings have the same phase. As a result, the rotor will not revolve in this fan configuration without a capacitor.To generate magnetic rotation, we must provide two separate phases for each winding; but, because most houses only have a single phase connection, we cannot provide two phases.As a result, a capacitor is employed to solve this problem. In the circuitry of an electrical fan, a capacitor is serially coupled with the beginning winding.When the switch is turned off, $230\mathrm{V}$ AC enters the circuit.The same phase enters the running winding and capacitor. However, because the capacitor adjusts the phase of the current, a shifted phase AC exits the capacitor and travels to the starting winding, while the applied phase AC remains in the starting winding.Magnetic rotation is generated by the two distinct phases in each winding, and therefore the rotor begins to rotate.As a result, a capacitor is employed in a fan to generate a phase difference in the current of the two windings, which produces a magnetic flux and causes the fan's rotor to move.

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