A 2082V, 1500-kVA 0.8-PF-lagging 60-Hz two-pole Y-connected synchronous generator has a synchronous reactance of 1.5 Ω and an armature resistance of 0.25 Ω. At 60 Hz, its friction and windage losses are 24 kW, and its core losses are 18 kW. The field circuit has a dc voltage of 200 V, and the maximum is 10 A. The resistance of the field circuit is adjustable over the range from 20 to 200 Ω. The OCC of this generator is shown in Figure-1 Assume that the field current of the generator has been adjusted to a value of 5 A. Compute the terminal voltage of this generator be if it is connected to a ∆-connected load with an impedance of 20∠30° Ω ? Sketch the phasor diagram of this generator. Compute is the efficiency of the generator at these conditions? Now assume that another identical ∆-connected load is to be paralleled with the first one. What happens to the phasor diagram for the generator? What is the new terminal voltage after the load has been added? What must be done to restore the terminal voltage to its original value?

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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.