IMPORTANCE OF POWER FACTOR j0.50 0.05Ω + 250Z0°V Load 1 P = 8 kW @ 0.8 lead Compute for the capacitor that must be connected to increase the power factor to 1 (or unity) Load 2 S = 20 KVA @ 0.6 lag Clue: TOTAL LOAD is: 20000 + j10000 VA @ 0.8944 LAGGING (without the capacitor)

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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.