Question

What is the formula for the maximum current in end ring, if the current in all bars are maximum at the same time?

(a) maximum current in the end ring= bars per pole * 2 * current per bar

(b) maximum current in the end ring= (bars per pole / 2) * current per bar

(c) maximum current in the end ring= bars per pole / 2 / current per bar

(d) maximum current in the end ring= bars per pole * 2 / current per bar

This question was posed to me in my homework.

The question is from Design of End Rings topic in division Three Phase Induction Motor of Design of Electrical Machines

Answer 1

The correct option is (b) maximum current in the end ring= (bars per pole / 2) * current per bar

To explain: First the bars per pole are obtained. Then the current per bar is calculated. Then substituting in the above formula, the maximum current in the end rings.