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Basic Electrical and Electronics Engineering by S. K. Bhattacharya

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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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