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Electric generators types depend on the type of generating equipment employed,
the electrical energy produced is either direct
current (DC) or alternating current (AC).
AC generators are classified as
single-phase or polyphase. A single-phase generator
is usually limited to 25 kW or less and generates AC
power at a specific utilization voltage. Polyphase
generators produce two or more alternating voltages
(usually two, three, or six phases). DC generators are classified as
either shunt, series, or compound-wound. Most DC
are the compound-wound type. Shunt
generators are usually used as battery chargers and
as exciters for AC generators. Series generators are sometimes used for street lights. The emf induced in
a DC generator coil is alternating. Rectification is needed to direct the flow of current in one direction.
The generator rotating commutator provides the
rectifying action.
References: “Joint Departments of the Army and the
Navy, Operation Maintenance and Repair
of Auxiliary Generators, 26 August 1996”
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