Alternator Detailed Ebook: What is mean by Alternators

A.C. generators or alternators (as they are
usually called) operate on the same fundamental
principles of electromagnetic induction as d.c.
generators. They also consist of an armature
winding and a magnetic field. But there is one
important difference between the two. Whereas
in d.c. generators, the armature rotates and
the field system is stationary, the arrangement
in alternators is just the reverse of it. In their
case, standard construction consists of armature
winding mounted on a stationary element called stator and field windings on a rotating element called rotor.

The stator consists of a cast-iron frame, which supports the armature core, having slots on its inner
periphery for housing the armature conductors. The rotor is like a flywheel having alternate
N and S poles fixed to its outer rim. The magnetic poles are excited (or magnetised) from direct current
supplied by a d.c. source at 125 to 600 volts. In most cases, necessary exciting (or magnetising) current is
obtained from a small d.c. shunt generator which is belted or mounted on the shaft of the alternator itself.
Because the field magnets are rotating, this current is supplied through two sliprings. As the exciting voltage
is relatively small, the slip-rings and brush gear are of light construction. Recently, brushless excitation
systems have been developed in which a 3-phase a.c. exciter and a group of rectifiers supply d.c. to the
alternator. Hence, brushes, slip-rings and commutator are eliminated.

Full Details In Book

Authors: Vishal Khachane, Khachane, Vishal

Date: 2019

Upload Date: 4/13/2021 5:28:59 PM

Format: epub




Language: English



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