what happen if ac supply is fed to rotor of the alternator
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Answer Posted / raul
When the dc supply is given to the rotor windings, then the
polarity of the north and south poles will be fixed in the
space and time, so a sinusoidal magnetic field/flux will be
set up in the air gap which in turn will cut the stator
conductors and hence as per the lenz's law, there will be
induced emf and consequently induced currents in the stator
conductors.
But if ac supply is provided to the rotor windings, then
the polarity of the north and south poles will not be fixed
and it will keep on varying as per the sinusoidal curve, so
a sinusoidal field/flux will not be created in the air gap,
no flux cutting of the stator conductors and hence no
current in the stator windings. That is why the rotor
windings are not provided with the ac supply.
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