Question: 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

A 4-pole, 3-phase, salient-pole synchronous machine is supplied from a 440-V (rms)

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.

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