申論題

1. A 380 V, 20HP, 60 Hz four-pole Y-connected three phase induction motor has the following impedances in ohms per phase referred to the stator circuit: R₁ =0.6 ohm, X_l = 1 ohm, R₂=0.3 ohm, X₂ =0.45 ohm, (magnetizing reactance) =25 ohm.
 The total rotational losses are 1000W and are assumed to be constant. The core loss is neglected. For a rotor slip of 2 percent at the rated voltage and rated frequency, find the motor's stator current. (10%)