A 100 kVA, 1100 V, three-phase, 6-pole, Y-connected, 50 Hz synchronous machine has synchronous reactance of 6 2 per-phase and negligible armature resistance. Its core losses are 7 kW and its friction and windage losses are 8 kW. The speed droop is 2.5%. Initially the machine is operated alone as a generator and the field current is adjusted such that the no-load voltage equals the rated voltage. a) If the generator is supplying a line current of 52.5 A at 0.85 PF lagging. Draw the phasor diagram and find the generator efficiency and voltage regulation. Also find the applied torque.

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Synchronous Generator

In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.

Salient Pole Rotor

Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.