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what is the major difference between dc generator and
synchronous generator?
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Answer Posted / 7anoter4
In three phase system the 3 phases windings are even
distributed along the stator periphery and since the 3
phase currents are 120 electrical degrees in time
distanced one from each other ,then an apparent rotating
magnetic field is installed[as an armature reaction].
The synchronous generator rotor rotates in the same time
with this field [stator itself does not move]. [differently
from the asynchronous[induction] generator in which rotor
velocity is more elevated than this field velocity and the
difference depends on the load.]
In d.c. generator no such rotating field is generated as
the armature reaction is always in d.c. field and it is
rotates with the rotor together[one could say it is
also "synchronous" rotation].
However this field disturbs the collector operation in the
commutation process.
In order to avoid this, commutation auxiliary poles are
located between excitation poles and are supplied by
armature current.
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