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how the rotating magnetic fieldis produced in induction
machines???
give the correct explanation.is there any mathematical
expression for the same?
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Answer Posted / ahamad kutty
Talking about an induction motor when we supply a 3 phase
supply to the stator a magnetic flux is produced in the
stator winding which rotate at the speed of the incoming
supply frequency.Since there is a rotor with conductor bars
the rotating flux in the stator winding induce an emf in the
rotor conductor bars as per Faraday's law of induction and
this emf rotate at the same speed as that of stator.since
the rotor conductor bars are short circuited a current is
circulated in the rotor. Now as per Faraday's law of
interaction the current carrying conductor lying in a
magnetic field will experience a force and locked to the
stator moving flux and starts to rotate at the slip
frequency which is just enough to supply friction and other
no load losses of the motor.
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