A 4-pole, 3-phase, salient-pole synchronous machine is supplied from a 440-V (rms) line-to-line, 60-Hz source. The...

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A 4-pole, 3-phase, salient-pole synchronous machine is supplied from a 440-V (rms) line-to-line, 60-Hz source. The machine is operated as a motor with the total input power of 40 kW at the terminals. The parameters are r; = 0.3N Lmd = 0.015 H Lis = 0.001 H Lmg = 0.008 H %3D Assume the positive direction of current is into the stator terminals. (a) The excitation is adjusted so that las lags Vas by 30°. Calculate Ea and the reactive power Q. Draw the phasor diagram. (b) Repeat a with the excitation adjusted so that Ias is in phase with Vas. (c) Repeat a with the excitation adjusted so that ias leads Vas by 30°. A 4-pole, 3-phase, salient-pole synchronous machine is supplied from a 440-V (rms) line-to-line, 60-Hz source. The machine is operated as a motor with the total input power of 40 kW at the terminals. The parameters are r; = 0.3N Lmd = 0.015 H Lis = 0.001 H Lmg = 0.008 H %3D Assume the positive direction of current is into the stator terminals. (a) The excitation is adjusted so that las lags Vas by 30°. Calculate Ea and the reactive power Q. Draw the phasor diagram. (b) Repeat a with the excitation adjusted so that Ias is in phase with Vas. (c) Repeat a with the excitation adjusted so that ias leads Vas by 30°.