The induced current inside the rotating armature conductors is alternating in nature & it is converted into DC using a split-ring commutator. It generates pulsating Direct current that does not change its direction.
#Encased emergency generator generator
It is also a type of generator that converts mechanical energy into DC electrical energy.
Therefore, the life expectancy of the brushes in the AC generator is more than the DC generator. And because the brushes continuously slide across it, there is no issue of short circuit or sparks between them. Since the slip rings are continuous rings it provides the alternating current generated inside the armature. The rings always rotate with the armature while the brushes remain stationary. These rings supply current the circuit through a sliding contact called brushes. The slip rings are two separate conducting rings connected with each terminal of the armature. The current induced in the armature is supplied to the circuit using slip rings. It is a type of generator designed to generate alternating current with a frequency of 50 or 60 Hz.
Since the armature rotates inside a stationary magnetic field, the direction of the current induced changes through half rotation. Generally, the rotor is the moving or rotating part of an electrical machine & the stator is the stationary part. Thus it is known as the Stator of the generator. The magnetic field surrounding the armature is either a permanent magnet or electromagnetic energized by a separate DC supply which remains stationary. The conductor is wounded around an armature in rectangular shape & because it rotates inside a generator, it is known as the Rotor of the generator. The generator uses the later, where the conductor spins inside a stationary magnetic field.
The alternator uses the idea of a rotating magnetic field around a stationary magnetic field but we are not discussing it in this article. In both cases, the magnetic field lines acting on the conductor changes & it induces an electric current in the conductor. Either rotate the magnetic field around a stationary conductor or spin the conductor inside a stationary magnetic field. However, there are two ways to vary the magnetic field acting on the conductors. The AC or DC generators apply the same principle to generate electric current.
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