Basic Electronics and Electrical Engineering: Chapter 2: DC Machines
Separately Excited DC Generators
In this type of generator, the field winding is excited by a separate DC supply.
SEPARATELY
EXCITED DC GENERATORS
In this type of
generator, the field winding is excited by a separate DC supply. The electrical
equivalent circuit of a separately excited d.c generator is shown in Fig. 2.13.
The field winding is
connected to a separate DC source. The load is connected across the armature
terminals.
Terminal Markings
• Z, ZZ‒Shunt field
winding Terminals
• Y, YY‒Series field
winding Terminals
• A, AA‒Armature
Terminals
Let Ra, Rsh
and Rse = resistance of armature, shunt field and series field
windings respectively
Ia, Ish
and Ise = current through the armature, shunt field, and series
field windings respectively.
IL = Load
current
V, Vsh =
Voltage across the load or terminal voltage of the generator and voltage across
the shunt field winding respectively.
Vb, Var
= voltage drop due to brush contact resistance, voltage drop due to armature
reaction respectively.
Eg = emf
generated on no‒load condition.
Ia = IL=
Current equation
Eg = V + IaRa
+ Vb + Var = voltage equation
Vb =2 × drop
due to each brush contact.
If Vb and Var
negligible, then
Eg = V + IaRa
Basic Electronics and Electrical Engineering: Chapter 2: DC Machines : Tag: Basic Engineering : - Separately Excited DC Generators
Basic Electronics and Electrical Engineering: Chapter 2: DC Machines
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Basic Electronics and Electrical Engineering
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