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DC generators are broadly classified into two types, depending upon their field excitation. They are
In seperately excited dc generator, the field coils are excited or energized from an independent external source.
In Self excited dc generator, the field coils are excited or energized by the current produced by the generator itself.
Shunt-wound generator is one type of self excited dc generator, here the field winding is connected in parallel to the armature. So, the full terminal voltage of the generator is applied across the field winding.
Series-wound generator is also one type of self excited dc generator, here the field winding is connected series with the armature. Since the field carries the full-load current, it consists of relatively few turns of thick wires, as show below. In series-wound generator, the resistance of the field coil is very low.
Compound-wound generator is actually a combination of a few series-wound and a few shunt-wound generators. Compound-wound generator can either be long shunt compound-wound generator or short shunt compound-wound generator. If the series field helps or supports the shunt field, the generator is said to be cumulatively compounded. If the series field opposes or resist the shunt field, the generator is said to be differential compounded.
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