Introduction
A Single Loop Generator / Simple Loop Generator is a basic concept of the DC Generator. It is a conductor placed between
the magnet bars. These magnetic bars may be of permanent magnet
or electro-magnet. The basic working of the simple loop generator is
that when the two wires, conductors or coils are placed between the magnet bars
and imagine the coil is rotating clockwise, the flux starts changing its
value and as a result EMF is induced in it.
Construction
A Simple/Single Loop Generator basically consists of two conductors or coils, two magnet bars and
two slip rings (which are insulated with each other and from central shaft)
and a normal wire for connection as required. The rotating coil may be assumed
as armature and the magnet bars field magnets.
Working Principle
Assume that the coil
or the two conductors are rotating in a clock-wise direction. The coil has a
fixed position between the field and the flux linked with it starts changing
its value. As a result, EMF is induced in it and it is proportional to
the rate of change of flux linkage. When the coil reaches at 90 degree
in the process of rotating, the coil slides don’t cut the flux and the flux
move parallel between them. As a result, EMF is not induced in the coil. As the
coil continues its rotation, the amount increases to its maximum and when the
coil reaches again at 90 degrees then in this case maximum EMF is induced in
the coil this is because of the maximum flux is produced.
The result is that
when the coil rotates from 90 to 180 degrees, the flux increases gradually and
the rate of change of flux linkage decreases.
When the coil rotates
from 180 to 360 degrees the variation occurs in the magnitude of the EMF. At
first EMF remains similar on the middle position EMF reaches to its maximum and
at the end minimum EMF is produced.
Conclusion
Remember
that the current produced in the coils is alternating and we get this
current rectified by the split rings. Hence it is cleared that
the armature of the DC Generator also provides Alternating Voltage.