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What is the purpose of shading coil in a shaded pole motor?

What is the purpose of shading coil in a shaded pole motor? Correct Answer generating a periodic magnetic field

Shaded pole induction motor:

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  • Shaded pole induction is a self-starting 1ϕ induction motor.
  • The stator poles of a shaded pole motor are divided into two parts.
  • One part of the pole consists of a short-circuited coil made up of copper which is known as the shading coil (shaded part) and the remaining part is known as the unshaded part of the pole.
  • When a 1ϕ is applied an alternating flux is generated. This flux links with the shaded coil.
  • Then voltage gets induced in the coil due to the variation in the flux linking.
  • Hence, the shaded portion is short-circuited due to which it produces the circulating current in it.
  • The main core flux is opposed by the flux in the ring that is developed by the circulating current.
  • Hence, flux is induced in the shaded portion of the motor along with the unshaded portion with a phase difference, which is lagging behind the unshaded pole flux.
  • There is also a space displacement that is less than 90°  between a shaded ring flux and the main motor flux.
  • Due to this space displacement, a rotating magnetic field is produced which leads rotation of the motor.

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