Lecture - DC Generators 1 Lecture Video
Lecture - DC Generators 2 Lecture Video
Simple generator Video
Magnet Generator Video
Simple Electric generator Video
Simple Electric generator II Video
Showing posts with label Generator. Show all posts
Showing posts with label Generator. Show all posts
Saturday, July 18, 2009
Monday, March 23, 2009
Basic Generator
Content
1 Separately Excited Generator
Now that we have learned some basic facts about DC
generators, we can study the various types and their properties.
Thus, instead of using permanent magnets to create the magnetic
field, we can use a pair of electromagnets, called field poles, as
shown in Fig.3.20. When the DC field current in such a generator
is supplied by an independent source (such as a storage battery or
another generator, called an exciter), the generator is said to be
separately excited. Thus, in Fig.3.20 the DC source connected to
terminals a and b causes an exciting current IX to flow. If the
armature is driven by a motor or a diesel engine, a voltage Eo
appears between brush terminals x and y.
A shunt-excited generator is a machine whose shunt field
winding is connected in parallel with the armature terminals, so
that the generator can be self-excited (Fig.3.22). The principal
advantage of this connection is that it eliminates the need for an
external source of excitation.
A compound generator (Fig.3.28a) is similar to a shunt
generator, except that it has additional field coils connected in
series with the armature. These series field coils are composed of a
few turns of heavy wire, big enough to carry the armature current.
The total resistance of the series coils is, therefore, small.
Fig.3.28b is a schematic diagram showing the shunt and series
field connections.
1 Separately Excited Generator
Now that we have learned some basic facts about DC
generators, we can study the various types and their properties.
Thus, instead of using permanent magnets to create the magnetic
field, we can use a pair of electromagnets, called field poles, as
shown in Fig.3.20. When the DC field current in such a generator
is supplied by an independent source (such as a storage battery or
another generator, called an exciter), the generator is said to be
separately excited. Thus, in Fig.3.20 the DC source connected to
terminals a and b causes an exciting current IX to flow. If the
armature is driven by a motor or a diesel engine, a voltage Eo
appears between brush terminals x and y.
1.1Separately Excited Generator Under Load
2 Shunt Generator
A shunt-excited generator is a machine whose shunt field
winding is connected in parallel with the armature terminals, so
that the generator can be self-excited (Fig.3.22). The principal
advantage of this connection is that it eliminates the need for an
external source of excitation.
2.1 Controlling The Voltage Of A Shunt Generator Shunt generator
under load
2.2 Shunt generator under load
3 Compound Generator
2.2 Shunt generator under load
3 Compound Generator
A compound generator (Fig.3.28a) is similar to a shunt
generator, except that it has additional field coils connected in
series with the armature. These series field coils are composed of a
few turns of heavy wire, big enough to carry the armature current.
The total resistance of the series coils is, therefore, small.
Fig.3.28b is a schematic diagram showing the shunt and series
field connections.
3.1 Differential Compound Generator
More ( pdf )
http://faculty.ksu.edu.sa/eltamaly/Documents/Courses/
EE%20339/DC%20Machines2.pdf
More ( pdf )
http://faculty.ksu.edu.sa/eltamaly/Documents/Courses/
EE%20339/DC%20Machines2.pdf
Simple Loop Generator
In Fig.3.4 is shown a single turn rectangular copper coil ABCD
moving about its own axis, a magnetic field provided by either
permanent magnets or electromagnets. The two ends of the coil are
joined to two slip-rings or discs a and b which are insulated from
each other and from the central shaft. Two collecting brushes (of
carbon or copper) press against the slip rings. Their function is to
collect the current induced in the coil and to convey it to the
external load resistance R.
moving about its own axis, a magnetic field provided by either
permanent magnets or electromagnets. The two ends of the coil are
joined to two slip-rings or discs a and b which are insulated from
each other and from the central shaft. Two collecting brushes (of
carbon or copper) press against the slip rings. Their function is to
collect the current induced in the coil and to convey it to the
external load resistance R.
Content
1.Working Theory:
1.Working Theory:
2.Practical Generator
3.Armature Windings
More
http://faculty.ksu.edu.sa/eltamaly/Documents/Courses/
EE%20339/DC%20Machines2.pdf
http://faculty.ksu.edu.sa/eltamaly/Documents/Courses/
EE%20339/DC%20Machines2.pdf
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