An approximate per phase equivalent circuit of a 3-phase, 220-V, well-connected, 6-pole, 60-Hz induction motor is shown in Fig. 5-8(a) for which R, = 0.3 ohms; X, = 0.4 ohms;

R, = 0.4 ohms; X, = 0.6 ohms; and X = 15N. For the given numerical values calculate (a) the input current, power, and power factor per phase; and(b) the total developed (or electromagnetic) torque. The motor speed is 1080 rpm.Ans. (a) 30.18 A; 10.302 kW; 0.896 lagging; (b) 75.45 N ·m