A 10-pole, 3-phase, 60 Hz induction motor is operating at a speed of 100 rpm. The frequency of the rotor current of the motor in Hz is __________(a) 52.4(b) 54.8(c) 51.66(d) 51.77I had been asked this question in semester exam.The above asked question is from Methods of Starting Electric Motors topic in division Starting of Electric Drives

A 10-pole, 3-phase, 60 Hz induction motor is operating at a speed of 1

1.	A 10-pole, 3-phase, 60 Hz induction motor is operating at a speed of 100 rpm. The frequency of the rotor current of the motor in Hz is __________(a) 52.4(b) 54.8(c) 51.66(d) 51.77I had been asked this question in semester exam.The above asked question is from Methods of Starting Electric Motors topic in division Starting of Electric Drives
Answer» Correct answer is (c) 51.66 The explanation: GIVEN a NUMBER of poles = 10. Supply frequency is 60 HZ. Rotor speed is 100 rpm. Ns = 120×f÷P=120×60÷10 = 720 rpm. S=Ns-Nr÷Ns = 720-100÷720=.86. F2=sf=.86×60=51.66 Hz.

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