Question 1: Why do we keep the speed oí the synchronous generator constant at no-load?What happens if the speed varies? Explain your observations.Question 2: Why does not the generator voltage increase when the excitation current (le)increases over the nominal value?Question 3:Explain the voltage at the terminals of the generator when the speed is atrated value (1500 rpm) but the excitation current is zero (le=0). What happens if we touchthe terminals of the generator at this instance?Question 4: Do we observe a voltage at the output if we reverse the direction of theexcitation current? Why? Explain.Question 5: Sketch and analyze the no-load operation curve of the generator using thevalues recorded in the experiment.Question 6: State your final observations about the experiment.

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Question 1: Why do we keep the speed of the synchronous generator constant at no-load? What happens if the speed varies? Explain your observations.

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter57: Dc Variable-speed Control-motor Drives

Section: Chapter Questions

Problem 8SQ

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Concept explainers

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.

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