Shaded-Pole Induction Motor

By 23 July 2017

This is another method to create two phases, with phase differences using pole shading.

The shaded pole has salient poles, each pole split into two sections. A small part of each pole face is wound with a short-circuited copper ring.

When supply is given, the flux under the shaded portion lags behind that of the unshaded portion. Thus a phase difference is created. This causes the creation of a rotating magnetic field.

The shaded pole motor is inexpensive, since it does not consist of an auxiliary winding or other mechanisms. These are low-torque motors, generally used for small fans and blowers.