Question

What is the formula of the end ring current?

(a) end ring current = number of rotor slots * bar current * 3.14 * number of poles

(b) end ring current = number of rotor slots * bar current * 3.14 / number of poles

(c) end ring current = number of rotor slots / bar current * 3.14 * number of poles

(d) end ring current = number of rotor slots * bar current / 3.14 * number of poles

I got this question in an interview for job.

My doubt stems from Design of Rotor in division Design of Single Phase Induction Motor of Design of Electrical Machines

Answer 1

The correct answer is (d) end ring current = number of rotor slots * bar current / 3.14 * number of poles

To explain: The number of rotor slots and the bar current along with the number of poles is calculated. On substitution it gives the end ring current value.