A 5000KVA, 6600V, 3 star connected alternator has a resistance of 0.75 per phase Estimate by ZPF method the regulation for a load of 500A at power factor (a) Unity (b) 0.9 Leading. If 32 50 75 100 140 Voc 3100 4900 6600 7500 8300 Zpfc 0 1850 4250 5800 7000

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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.