BASIC AC THEORY 9

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AC GENERATOR COMPONENTS

AC generators are widely used to produce AC voltage. To understand how these
generators operate, the function of each component of the generator must first be
understood.

Field

The field in an AC generator consists of coils of conductors within the generator that receive a
voltage from a source (called excitation) and produce a magnetic flux. The magnetic flux in the
field cuts the armature to produce a voltage. This voltage is ultimately the output voltage of the
AC generator.

Armature

The armature is the part of an AC generator in which voltage is produced. This component
consists of many coils of wire that are large enough to carry the full-load current of the
generator.

Prime Mover

The prime mover is the component that is used to drive the AC generator. The prime mover may
be any type of rotating machine, such as a diesel engine, a steam turbine, or a motor.

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