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Basic Electrical and Electronics Engineering
book

Basic Electrical and Electronics Engineering

by S. K. Bhattacharya
August 2011
Beginner content levelBeginner
724 pages
20h 32m
English
Pearson India
Content preview from Basic Electrical and Electronics Engineering

7

DC Machines

TOPICS DISCUSSED
  • Working of a dc machine as a generator and as a motor

  • Basic principle of dc machines

  • Constructional details

  • Need of brush and commutator

  • Types of windings

  • EMF equation

  • Types of dc machines and their characteristics

  • Starting of a dc motor

  • Speed control

  • Losses and efficiency

7.1 Introduction and Principle of Working

DC machines work either as a dc generator or as a dc motor. In a dc generator, a set of conductors or coils placed on a rotating body, called armature, are rotated continuously inside a magnetic field with the help of a prime mover (prime mover is another machine, may be a diesel engine or a turbine, which rotates the armature). The magnetic field is created by passing dc current through the windings ...

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Publisher Resources

ISBN: 9788131754566