The output at the BAT terminal is DC voltage.
A generator typically produces AC voltage but since most batteries and appliances uses DC voltage therefore through the use of diodes it is converted into DC voltage
A diode is an electrical component that allows the flow of current in only one direction. In circuit diagrams, a diode is represented by a triangle with a line across one vertex. The most common type of diode uses a p-n junction.
Six diodes are located in the end frame assembly nearest the slip rings.
Three of these diodes are negative and are mounted directly in the end
frame.
Three positive diodes are mounted into a heat sink, which is insulated from the end frame. These six diodes (three positive and three negative), change AC from the stator windings to a flow of DC, which appears at the output terminal of the alternator.
Thus, the rotor, stator, and diodes act together to produce DC voltage which appears at the BAT (output) terminal.
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