Question

What is the formula of the core length?

(a) core length = pole length * pole pitch

(b) core length = pole length / pole pitch

(c) core length = pole length + pole pitch

(d) core length = pole length – pole pitch

The question was posed to me in an internship interview.

My question is based upon Separation of D and L, Standard Frames topic in division General Concepts and Constraints in Design of Rotating Machines of Design of Electrical Machines

Answer 1

The correct option is (b) core length = pole length / pole pitch

For explanation: Core length is one of the factors used in the separation of D and L of the DC machines. It is the ratio of the pole length to the pole pitch.