3. A factory's separately excited DC generator has an armature resistance of 0.250. The machine is driven at 1000 revolutions per minute giving the following data: E,[V] I[A] a) Plot the open circuit characteristic when the machine is driven at 1000 and at 1500 rev/min. b) If the machine is drive at 1500 rev/min and its field current is adjusted to 0.2 A, plot the output voltage (in the same axis with (a)) as the load current is varied from 0 to 40A. For a full load current of 40A, what is the voltage regulation? 5 28 75 112 132 150 0.1 0.3 0.5 0.7 0.9

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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.