A 14-pole, 3-phase, 50 Hz induction motor is operating at a speed of 99 rpm. The frequency of the rotor current of the motor in Hz is __________(a) 39.5(b) 40(c) 38.45(d) 39.9The question was asked in quiz.Enquiry is from Starting topic in portion Starting of Electric Drives

A 14-pole, 3-phase, 50 Hz induction motor is operating at a speed of 9

1.	A 14-pole, 3-phase, 50 Hz induction motor is operating at a speed of 99 rpm. The frequency of the rotor current of the motor in Hz is __________(a) 39.5(b) 40(c) 38.45(d) 39.9The question was asked in quiz.Enquiry is from Starting topic in portion Starting of Electric Drives
Answer» The correct option is (c) 38.45 Explanation: Given a number of poles = 14. SUPPLY FREQUENCY is 50 Hz. ROTOR speed is 699 RPM. Ns=120×f÷P=120×50÷14 = 428.57 rpm. S=Ns-Nr÷Ns=428.57-99÷428.57=.769. F2=sf=.769×50=38.45 Hz.

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A 14-pole, 3-phase, 50 Hz induction motor is operating at a speed of 99 rpm. The frequency of the rotor current of the motor in Hz is __________(a) 39.5(b) 40(c) 38.45(d) 39.9The question was asked in quiz.Enquiry is from Starting topic in portion Starting of Electric Drives

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