A 2-pole, 3-phase, 50 Hz induction motor is operating at a speed of 400 rpm. The frequency of the rotor current of the motor in Hz is __________(a) 43.33(b) 42.54(c) 43.11(d) 41.47This question was posed to me in final exam.This is a very interesting question from Effect of Starting on Power Supply, Motor and Load in portion Starting of Electric Drives

A 2-pole, 3-phase, 50 Hz induction motor is operating at a speed of 40

1.	A 2-pole, 3-phase, 50 Hz induction motor is operating at a speed of 400 rpm. The frequency of the rotor current of the motor in Hz is __________(a) 43.33(b) 42.54(c) 43.11(d) 41.47This question was posed to me in final exam.This is a very interesting question from Effect of Starting on Power Supply, Motor and Load in portion Starting of Electric Drives
Answer» CORRECT ANSWER is (a) 43.33 For explanation: Given a NUMBER of poles = 2. Supply frequency is 50 HZ. Rotor speed is 400 rpm. Ns = 120×f÷P=120×50÷2 = 3000 rpm. S=Ns-Nr÷Ns = 3000-400÷3000 = .8666. F2=sf=.8666×50=43.33 Hz.

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