In all the generators, the excitation supply is DC. What is
the significance of DC excitation? What will happen if AC
supply is given as excitation supply?
- 8 Answers
- 12537 Views
- I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / phani
if ac supply is given as excitation supply the poles are
changed for every half cycle .d.c suuply gives the consant
pole
| Is This Answer Correct ? | 32 Yes | 0 No |
Answer / aero.diwa
ACCORDING TO FARADAYS LAWS, ONLY ONE ROTATING PART(FIELD OR
CONDUCTOR)AND OTHER SHOULD BE STATIONARY.
IF IT IS NOT DONE THE FARADAYS LAWS CANT BE APPLIED.IF WE
GIVEN A.C SUPPLY TO THE ROTOR OF THE ALTERNATOR(AC SUPPLY
HAVING HAVE BOTH +VE & -VE CYCLES)& ALSO THE ROTOR IS
ROTATING PART.IN THIS THE AC SUPPLY AND ROTATING ARMATURE
BOTH ARE IN MOTION,THATS WHY THERE IS NO INDUCED EMF IN THE
STATOR(B'COZ THERE IS NO CHANGE IN FLUX i.e E=d(PHI)/dt.)
| Is This Answer Correct ? | 19 Yes | 0 No |
Answer / adarsh
it is not possible to use AC supply for excitation because
for the excitation need stable magnetic field which is not
possible to got in AC, AC polarity is changed in every half
cycle, so it must be need DC for excitation.
| Is This Answer Correct ? | 4 Yes | 0 No |
Answer / rk
by appling ac there will be no relative elect field motion
between field and armture which will prevent generation of
emf.
| Is This Answer Correct ? | 5 Yes | 2 No |
Answer / vikas
If we give ac supply the function of the motar remains same
but the thing is that as ac voltage depends on frequency
eddy current losses increases.This can be eliminated by
laminating.
| Is This Answer Correct ? | 2 Yes | 0 No |
Answer / chandrashekar
we will be using coils with no of turns in place of
permanent magnet. when there is a electric power supply by
these coils we can it as excitation
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / don
THERE WILL BE NO DEFINITE POLES IN ROTOR,ALSO THE EDDY
CURRENT LOSSE WILL BE MORE IF AC IS GIVEN AS EXCITATION.
| Is This Answer Correct ? | 1 Yes | 4 No |
Transformer Parallel Operations
which network topology offers the greatest level of tolerance?
1 kva how much amps? How to calculate ?
Why different values of B’s (magnetic flux density) are chosen for DC machines and Induction Motors?
Why the starting current in Induction Motor is very high as compared to normal rated current ????
When a single pase capacitor run motor- run on 230vac and Case(1)run with 8 Mfd 250 vac.capacitor , Case( 2) run with 8 Mfd 400vac capacitor. What is difference between both case regarding power ,efficiency etc?
is it true there's a big difference in using Cummins or Denyo...especially power output or leakage
prove that power consumed in 3 phase delta system is 3 times as compared to 3 phase star system
why it is necessary to short and ground of a current transformer secondary side?
Which capacitor is preferred for high voltage and frequency?
My self munna.I had completed diploma from mechanical can I join facility and maintanance companys
What is excitation?
-
Civil Engineering (5085) - Mechanical Engineering (4451)
- Electrical Engineering (16632)
- Electronics Communications (3918)
- Chemical Engineering (1095)
- Aeronautical Engineering (239)
- Bio Engineering (96)
- Metallurgy (361)
- Industrial Engineering (259)
- Instrumentation (3014)
- Automobile Engineering (332)
- Mechatronics Engineering (97)
- Marine Engineering (124)
- Power Plant Engineering (172)
- Textile Engineering (575)
- Production Engineering (25)
- Satellite Systems Engineering (106)
- Engineering AllOther (1379)
