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An automotive alternator is rated 500 VA and 20 V. It delivers its rated voltamperes at a power factor of 0.85. The resistance per phase is 0.05 Q, and the field takes 2 A at 12 V. If the friction and windage loss is 25 W and the core loss is 30 W, calculate the percent efficiency under rated conditions.
14.43 A non–salient pole, Y-connected, three-phase, two-pole synchronous machine has a synchronous reactance of 7 Q and negligible resistance and rotational losses. One point on the open-circuit characteristic is given by Vo = 400 V (phase voltage) for a field current of 3.32 A. The machine is to be
operated as a motor, with a terminal voltage of 400 V (phase voltage). The armature current is 50 A, with power factor 0.85, leading. Determine Eb, field current, torque developed, and power angle δ.
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