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 HzI 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

A 3 – phase, 4 pole IM is supplied from a 40 Hz source. Calculate ro

1.	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 HzI 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
Answer» 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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