Question

What is the formula for the radial length of the pole shoe?

(a) radial length of the pole shoe = height of winding – height of pole shoe – 0.02

(b) radial length of the pole shoe = height of winding + height of pole shoe – 0.02

(c) radial length of the pole shoe = height of winding – height of pole shoe + 0.02

(d) radial length of the pole shoe = height of winding + height of pole shoe + 0.02

I got this question by my college professor while I was bunking the class.

Question is taken from Design of Rotor topic in portion Design of Synchronous Machines of Design of Electrical Machines

Answer 1

Right option is (d) radial length of the pole shoe = height of winding + height of pole shoe + 0.02

For explanation: First the height of the winding is calculated from its formula. Next the height of pole shoe is calculated. Both the values are added with 0.02 to give the radial length of the pole shoe.