A 10kW, 400 V, 3-phase, 4-pole, 50 Hz delta-connected induction motor is running

Question: A 10kW, 400 V, 3-phase, 4-pole, 50 Hz delta-connected induction motor is running at no load with a line current of 8 A and an input power of 660 watts. At full load, the line current is 18 A and the input power is 11.20 kW. Statoir effective resistance per phase is 1.2 Ω and friction, windage loss is 420 watts. For negligible rotor ohmic losses at no load, calculate

(a) stator core loss (

b)total rotor losses at full load;

(c) al rotor ohmic losses at full load

(d) full load speed

(e) internal torque, shaft torque and motor efficiency.

Solution:

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