Question

What is the formula for current in each of rotor bar?

(a) current in rotor bar = 2 * slot pitch * window space factor * stator torque * stator current * power factor * rotor slots

(b) current in rotor bar = 2 * slot pitch * window space factor / stator torque * stator current * power factor * rotor slots

(c) current in rotor bar = 2 * slot pitch * window space factor * stator torque * stator current * power factor / rotor slots

(d) current in rotor bar = 2 * slot pitch / window space factor * stator torque * stator current * power factor / rotor slots

This question was posed to me in homework.

My doubt stems from Design of Rotor Bars and Slots in section Three Phase Induction Motor of Design of Electrical Machines

Answer 1

The correct option is (c) current in rotor bar = 2 * slot pitch * window space factor * stator torque * stator current * power factor / rotor slots

The explanation is: For the calculation of the current through each rotor bar, firstly we find out slot pitch, window space factor and rotor slots. Then the stator torque and stator current are obtained with respect to stator side.