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Why DC excitation is used for alternators? Why cant it be AC?
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Answer Posted / glenn20sal
AC SUPPLY IS GIVEN TO THE STATOR WHICH PRODUCES ROTATING
MAGNETIC FIELD ROTATING AT CONSTANT RPM
INORDER FOR THE ROTOR TO CATCH UP WITH THE ROTATING FIELD
THE ROTOE SHOULD HAVE ONE DIRECTION MAGNETIC FIELD ONLY
THEN IT CAN ROTATE.
THEREFORE THE EXCITATION IS DC
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