A 3-phase, 4-pole, star connected, 415 V, 50 Hz, induction motor has the following T equivalent circuit parameters: R = 0.4 2, R2= 0.56 2, X, = X2 = 1.05 2, and Xm= 47.92 N (R. can be ignored) The total friction, windage, and core losses may be assumed to be constant at 700 W, independent of load. a) Calculate the starting internal torque and the corresponding stator current. b) Determine the maximum internal torque and the corresponding rotor speed. Sketch the torque versus speed curve for 415 V, 50 Hz operation, using the results of a) and b). c)

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