EE 702 · Chapter 3
Utilization of Electrical Energy past question
3.8 Variable Frequency Supplies for AC Drive
A 400 V 4 pole 50 Hz3 phase star connected induction motor has the following parameters: number of stator turns/phase is twice the number of rotor turns/phase. R₁ = 0.64 Ω, X₁ = 1.1 Ω, R₂ = 0.8 Ω, X₂ = 0.12 Ω. The load torque is proportional to the square of speed and is 40N-m, at 1440 rpm. If the motor speed is 1300 rpm, find (a) load torque (b) rotor current (c) stator applied voltage. Neglect no load current.