Why Capacitor is used in a Fan?

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  • 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,230V 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, 230V 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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