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A 3 – phase, 4 pole IM is supplied from a 40 Hz source. Calculate rotor frequency when the rotor runs 100 rpm.

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A 3 – phase, 4 pole IM is supplied from a 40 Hz source. Calculate rotor frequency when the rotor runs 100 rpm.

(a) 35 Hz

(b) 36.6 Hz

(c) 9 Hz

(d) 8 Hz

I had been asked this question in my homework.

My enquiry is from Induction Motors in division Braking of DC Motors & Induction Motors of Electric Drives

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Correct choice is (b) 36.6 Hz

To explain I would say: The slip of the induction motor can be calculated using the relation s = Ns-Nr÷ Ns. Ns=120F÷P=1200 rpm. The value of slip is .91. The rotor frequency is 36.6 Hz.

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