A 11 kV, 50 Hz, four-pole, star-connected alternator is being synchronised on an infinite bus. On the moment of synchronising, the excitation is such that the induced emf is 10% too low and the synchronising angle is 8° electrical leading. If the synchronous reactance is 6 Ω/phase, determine the torque at synchronising. Mention the necessary assumptions.

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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.