8. The following test data were obtained for a 10 HP, 220 V, three-phase motor delivering the rated load output: Line Voltage Volts Volts A-B B-C 220 220 At the rated load, determine: Volts C-A 220 Line Current Amperes A 27 a. the input volt-amperes. b. the power input. c. the power factor. Amperes Amperes B С 27 27 Wattmeter Readings No. 1 No. 1 Watts Watts 5940 2800

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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.