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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