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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?
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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 |
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