synchronous me
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter30: Dc Motors
Section: Chapter Questions
Problem 3RQ
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Concept explainers
Synchronous Generator
In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.
Salient Pole Rotor
Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.
Question

Transcribed Image Text:Q4: Give a sufficient reason with a brief and complete explanation illustrated by the diagram and the
equations? If it is necessary for each of the following points?
(1) In a synchronous motor, which loss varies with the load?
(2) Why is the damping winding used in a synchronous Motor, generally?
(3) When is it preferable to use a synchronous motor over an inductive?
(4) Discuss the nature of armature MMF in an alternator, bringing out its effect on field MMF at
various power factors.
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