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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?

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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 W

I 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

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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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