Why DC excitation is used for alternators? Why cant it be AC?
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Answer Posted / ashish bhagat
alternator works on the base of electromagnetic induction.
according to electromagnetic induction, EMF will induced in
the conductor(armature) when it cuts magnetic flux.
therefore to produced EMF it neccesery produced constant
magnetic flux. therefore magnetic poles are excited by DC
source only beacuse flux produced by AC supply will having
changing frequency.
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