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can a rotating machine give the DC output without commutator?
if yes, how? if no, why?
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Answer Posted / s.sivaranjani
According faraday's law of electromagnetic induction
whenever there is a chanage in flux linked with the coil ,
it will be induced by an e.m.f (volatge).
Induced volatge will be of same type as that of source(i.e
alternating).
In DC machine(i.e) generator, the elecromagnetic poles are
generated with DC supply.
Dc machine consists of two main parts 1.stator 2.rotor
stator - stationary part consists of Poles.(north & south)
Rotor is a rotating one.also called as armature.
Rotor is fed by meachinal input i.e angular rotation.
Initially the rotor with armature coils do not carry any
current.
Because of the maechanical input the armature starts to
rotate at the constant magnetic field.
Therefore the armature experiences chnage in flux.
Hence an emf will be induced in the armature according to
faraday's law.
The generated emf is AC type. In order to make it
unidirectional (i.e DC) an arrangement is needed.
The arrangement is called Commutator.
Along with commuatator brush assembly is required to take
out the DC supply.
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