Question

What is the formula for the pole arc?

(a) pole arc = number of bars per pole * stator slot pitch * 0.8

(b) pole arc = number of bars per pole / stator slot pitch * 0.8

(c) pole arc = number of bars per pole * stator slot pitch / 0.8

(d) pole arc = 1 / number of bars per pole * stator slot pitch * 0.8

I had been asked this question in examination.

My enquiry is from Design of Rotor in division Design of Synchronous Machines of Design of Electrical Machines

Answer 1

Correct option is (a) pole arc = number of bars per pole * stator slot pitch * 0.8

To explain I would say: The number of bars per pole is calculated along with the stator slot pitch. Next, all the values are multiplied by 0.8 and the pole arc value is obtained.