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A 3-phase, 50 Hz, 6-pole induction motor has a shaft output of 10kW at 930 rpm. Friction and windage losses is 1% of the output. Total stator losses is 600W. What is the rotor input?(a) 10860 W(b) 10100 W(c) 11460 W(d) 11000 WI got this question in an interview for job.Query is from Operating (or Performance) Characteristics of Induction Motors in chapter Induction Machines of Electrical Machines

Answer»

Correct answer is (a) 10860 W

The explanation is: FULL load SLIP = 1000-930/1000 = 0.07.

Friction LOSSES = 0.01*10000 = 100 W

Pm = 10000+100 = 10100 W

Rotor input = 10100/0.93 = 108060 W



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