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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 Posted / 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.)
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