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A 440 V 4-pole 3 phase 50 Hz slip ring induction motor has its stator winding...

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Electrical Engineering

  1. A 440 V 4-pole 3 phase 50 Hz slip ring induction motor has itsstator winding mesh connected and its rotor winding star connected.The standstill voltage measured between slip rings with the rotoropen –circuited is 218 V. the stator resistance per phase is 0.6Ωand the stator reactance per phase is 3Ω. The rotor resistance perphase is 0.05Ω and the rotor reactance per phase is 0.25Ω.Calculate the maximum torque and the slip at which it occurs. Ifthe ratio of full-load to maximum torque is 1:2.5 find thefull-load slip and the power output. [smax =0.1;Tmax= 278 Nm; s=0.02; P=17.1 kW]

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