Question

What happens in the shaded pole starting method according to the displacement?

(a) displacement between shaded and unshaded portion varies between 20°-25°

(b) displacement between shaded and unshaded portion varies between 20°-35°

(c) displacement between shaded and unshaded portion varies between 20°-30°

(d) displacement between shaded and unshaded portion varies between 30°-45°

This question was posed to me in semester exam.

My question is taken from Types of Motor topic in section Design of Single Phase Induction Motor of Design of Electrical Machines

Answer 1

Correct choice is (c) displacement between shaded and unshaded portion varies between 20°-30°

For explanation I would say: The shaded pole starting method is that the part of the pole is shaded by short circuited copper ring. The displacement between shaded and unshaded portion varies between 200-300.