Question 1: Explain the dynamo voltage drops as the dynamo is loaded? w w. Question 2: Why does the dynamo speed decrease as the load increases, explain why the asynchronous motor current that rotates the dynamo increases? Question 3: What is the load operating and external characteristic curve of the D.C shunt dynamo with the values obtained from the experiment? Question 4: Considering the dynamo cycle, find the voltage drops due to armature resistance with the values obtained and analyze the result? Question 5: Explain the characteristics of the D.C shunt dynamo and where it is used?

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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.