DC Generators
DC EQUIPMENT CONSTRUCTION
DC EQUIPMENT CONSTRUCTION
Direct current machines are energy transfer devices. These machines can function
as either a motor or a generator. DC motors and generators have the same basic
construction, differing primarily in the energy conversion. To better understand
the operation and construction of DC machines, a few basic terms must be
understood.
EO 1.4
STATE the purpose of each of the following
components of a DC machine:
a.
Armature
b.
Rotor
c.
Stator
d.
Field
Armature
Figure 2 Basic DC Machine
The purpose of the armature is to
provide the energy conversion in a
DC machine (refer to Figure 2).
In a DC generator, the armature is
rotated by an external mechanical
force, such as a steam turbine.
This rotation induces a voltage and
current flow in the armature.
Thus,
the
armature
converts
mechanical energy to electrical
energy.
In a DC motor, the armature
receives voltage from an outside
electrical source and converts
electrical energy into mechanical
energy in the form of torque.
Rotor
The purpose of the rotor is to provide the rotating element in a DC machine (refer to Figure 2).
In a DC generator, the rotor is the component that is rotated by an external force. In a DC
motor, the rotor is the component that turns a piece of equipment. In both types of DC
machines, the rotor is the armature.
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