They rotate the armature coil.
because DC generator generates generally generate DC power but as it has slip rings which convert it into ac output power
No. Just the opposite. An AC alternator uses slip rings, a DC generator uses a commutator. Most modern auto alternators are in fact AC alternators that rectify the AC output to DC using a diode bridge.
If the commutator is removed from your generator, you (if you connect slip rings) get AC supply instead of DC supply. the function of the commutator is to convert AC to DC supply and vice versa.Additional AnswerRemoving the commutator will also prevent you from connecting the output of the generator to its load. Remember, the generator's armature is spinning!
you apply dc voltage to slip rings in synchronous generators polarity will make no difference ( other than when it is first applied )
Slip rings are used in AC while split rings are used in DC generators
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In a very simple, laboratory-type, a.c. generator -yes. In practical generators, the output (armature) windings are part of the stator, so do not rotate and, so, don't require slip rings.
An AC generator generally called an alternator because it is generating a alternating current, consist of a rotor, field stator, slip ring assembly or rectifier bridge mounted in the place of the slip ring, in the case of a brushless alternator and an AVR (Automatic Voltage Regulator)
slip rings
Split rings are in AC generators ( alternating current) while slip rings are in DC current (direct current).
The split rings cause the direction of the magnetic field in the armature to change direction as the motor rotates. If this didn't happen the motor would not rotate. Slip rings can be used for an AC motor which causes the direction of the magnetic field to change with the AC waveform.
U sohuld replace the slip-ring which it is in the AC generator to a commutator. It is a split-ring. Then u can produce DC generator.