Question

What is the range of the ratio of radial length of pole to pole pitch?

(a) 0.3-1

(b) 0.3-1.5

(c) 0.7-1

(d) 0.7-1.5

I have been asked this question in an interview for job.

My question is from Design of Rotor in chapter Design of Synchronous Machines of Design of Electrical Machines

Answer 1

Right answer is (b) 0.3-1.5

The explanation: The minimum value of the ratio of radial length of pole to pole pitch is given to be 0.3. The maximum value of the ratio of radial length of pole to pole pitch is given to be 1.5.