GP Repair Theory of Operation
wc_tx000547gb.fm 67
5. Theory of Operation
5.1 Introduction
A generator set is a transducer, which means it converts energy from
one form of (heat) into another (electrical). The two main components
of a generator set are the prime mover (engine) and the generator
assembly. The engine converts heat into rotating mechanical energy
which is then converted by the generator assembly into electrical
energy. The generator accomplishes this through the principle of
electromagnetic induction. This principle states that when a coil of wire
(also referred to a winding) is passed through a magnetic field, a
voltage is induced in the coil of wire. The amount of voltage depends
on three factors: 1) the speed of the coil cutting through the magnetic
field (it does not matter which is moving—either the magnetic field or
the coil); 2) the strength of the magnetic field; and 3) the number of
turns of wire in the coil. The principle also works in reverse; that is, if a
voltage and current are present in a coil of wire, a magnetic field is
produced. It is important to understand this basic theory to understand
how the generator functions.
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