Question

What is the relation of closed slots with leakage reactance and overload capacity?

(a) closed slots give high leakage reactance, and increases the overload capacity

(b) closed slots give high leakage reactance, and decreases the overload capacity

(c) closed slots give low leakage reactance, and decreases the overload capacity

(d) closed slots give low leakage reactance, and increases the overload capacity

I got this question in class test.

My question comes from Design of Rotor Bars and Slots topic in section Three Phase Induction Motor of Design of Electrical Machines

Answer 1

Right answer is (b) closed slots give high leakage reactance, and decreases the overload capacity

Explanation: The closed slots have the main advantage of giving high leakage reactance. A high leakage reactance gives the advantage that the current at the starting can be limited.