A 480V synchronous generator. 200 kVA, 0.8 power factor lagging, 60 Hz, two poles. connected in Y. It has a synchronous reactance of 0.25Ω and an armature resistance of 0.04Ω at 60 Hz, its own friction losses and with the air are 6 kW and its core losses are 4 kW. The field circuit has a voltage of 200 V and the maximum Is is 10 A. The field resistance is adjustable in a range of 20 to 200 Ω. The generator occ is shown in the figure below. a) How much field current is required so that Vi is equal to 480 v when the generator operates without load? b) What is the internal voltage generated in this machine under nominal conditions? c) How much field current is required for Vi to equal 480 V when the generator is operating at rated conditions? d) How much power and torque must the prime mover of the generator be able to supply?

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Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.