Question

What is the range of clearance that can be left between rotor bars and the core?

(a) 0.1-0.4 mm

(b) 0.2-0.4 mm

(c) 0.15-0.4 mm

(d) 0.4-0.6 mm

I got this question in an international level competition.

My question is based upon Design of Rotor Bars and Slots topic in portion Three Phase Induction Motor of Design of Electrical Machines

Answer 1

Correct answer is (c) 0.15-0.4 mm

Easy explanation: The range of clearance is chosen based on whether the slots are skewed or not. The range is usually chosen between 0.15-0.4 mm.