Shunt Generators: With field regulators are used for ordinary lighting and power supply purposes.They are also used for charging batteries because their terminal voltage are almost constant or can be kept constant.
Series Generators: Series generators are not used for power supply because of their rising characteristics.However, their rising characteristic makes them suitable for being used as boosters.
Compound Generators: Cumulatively-compound generators are used for motor drives which require dc supply at constant voltage, for lamp loads and for heavy power services such as electric railways.
The differetial-compound generators has an external characteristics similar to that of a shunt generator but with large demagnetization armature reaction,hence,it widely used in arc welding where larger voltage is desirable with increase in current.
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