Question

A 3-phase, 4-pole, 1440 rpm, 50 Hz induction motor has star-connected rotor winding, having a resistance of 0.2 2 per phase and a standstill leakage reactance of 12 per phase. When the stator is energised at rated voltage and frequency, the rotor induced e.m.f. at standstill is 120 V per phase.

(a) Calculate the rotor current, rotor power factor and torque both at starting and at full load and compare these results.

(b) If an external resistance of 12 per phase is inserted in rotor circuit, calculate rotor current, rotor power factor and torque at the time of starting.​

Answer 1

Answer:

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