Correct option is B
In a shaded pole motor, a shading coil is a short-circuited copper ring or coil placed around a portion of each pole. Its main purpose is to create a phase shift in the magnetic field within the pole.
· When alternating current flows through the stator winding, it creates a pulsating magnetic field.
· The shading coil delays the magnetic flux in the shaded portion of the pole, creating a time difference between the shaded and unshaded parts of the pole.
· This time difference in the magnetic flux results in a weak, rotating magnetic field, which is necessary to start the motor.
This rotating magnetic field is what causes the rotor to turn in the shaded pole motor. Without the shading coil, the motor would not have a rotating magnetic field and thus would not start.
Application of shaded pole motor:
· toys
· hair dryers
· desk fans
· cooling fans
· slide projectors
· advertising displays
· Air conditioner
