flow chart of field regulator aman vahora(SVIT)

1. Name:- Aman m Vahora
Topic:- Design Of Flow chart of Field
Regulators
1

2. Function
• The function of field regulators in case of DC shunt
generators is to control the value of field current
thereby controlling the terminal voltage of the
generator.
• The generated EMF in a DC generator is:







A
P
60
ZN
Eg
Eg
NEg 
NKEg 

4. • From the above equation, it is clear that the
generated EMF is directly proportional to the
product of flux per pole and speed.
• If generator runs at constant speed then the
generated EMF is directly proportional to the
flux per pole and hence to the field current If.
• The terminal voltage on load:
V = E - IaRa

5. • With the increase in load current, terminal
voltage will slightly decrease due to the ohmic
drop in the armature and due to armature
reaction.
• This decrease in terminal voltage under load
can easily be neutralized by increasing field
current slightly and therefore constant
terminal voltage can be maintained.

6. • A D.C. shunt generator should maintain a
constant voltage across its terminals
irrespective of the magnitude of load being
supplied by it.
• It is not easy to control the speed of armature
in a D.C. shunt generator except by varying the
speed of the prime mover.

7. • So, it I s undesirable to regulate the terminal
voltage of a generator by variation of speed.
• Therefore it is customary to vary the magnetic
flux for this purpose.
• This can be easily by inserting a variable or
adjustable resistance in series with the main
field circuit as shown in figure

8. • This permits a wide range of control of
induced EMF.
• This variable or adjustable resistance is called
the shunt field regulator.

9. Flow chart of Field Regulator:

10. start
Read i/p data like Kw,Lap/wave,No&width of vent.duct,iron
factor,Ratio of length to pole arc,etc.
Curves like B/H,Losses,Carter coefft.,
Tableslike Bav,q etc.
Design constarin for flux densities,Current densities etc.
Formulate Computer Program in corporating max&min limits
Aramture velocity,no.of studs for field regulator,no.of section
resistor for field regulator,current in field wdg,current
volume,width of armature,cu strip,Assume suitable value for
certain parameters & Define objective function

11. Run for ittriations with permissible ranges speed,armature current densities,Field
current densities,no.of speed variations to get possible design outputs.
Total no.of regulator studs
Total no.of each section
Resistor value in each section
Design of tapping to stud of field regulator

12. Are design
Constraints
Satisfied?
Go to next
iterations
Is objective
Function
Achived
Y
E
S
Print output for all Possible design Variants
No
No
Yes

13. Select the optimal design
Stop