Question

What is the range of current density in the damper bars?

(a) 3-4 A per mm^2

(b) 3-5 A per mm^2

(c) 3-6 A per mm^2

(d) 4-6 A per mm^2

I got this question during an interview.

Question is taken from Design of Rotor in chapter Design of Synchronous Machines of Design of Electrical Machines

Answer 1

The correct option is (a) 3-4 A per mm^2

Explanation: The minimum value of the current density in the damper bars is given to be 3 A per mm^2. The maximum value of the current density in the damper bars is given to be 4 A per mm^2.