230V, 50Hz, four-pole, three-phase, star connected synchronous motor has a synchronous resistance and reactance of 0.1 and 1.5 in ohms per phase, respectively. If the synchronous motor operates lightly with a load angle of 5 degrees and a back electromotive force (emf) of 120V per phase, determine: (i) The effective armature voltage per phase (il) The armature current per phase (ill) The power factor of the motor

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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.