Answer / phanendra babu

if it is 3ph supply there will be a displacement of 120
degrees b/w each phase so the flux produced is also having
the same displacement,if we add these three phasors the
resultant flux will rotate anti clock wise from instant to
instant.

Answer / ishaan

With the application of balanced 3-phase currents in the
stator windings of induction motor, flux produces due to all
the 3 currents which are 120 degrees apart to each other,
resultant of which is the net magnetic flux rotating in the
air gap. It is said to be alternating due to continues
occurence of N and S poles in succession.

Answer / rahul

When a net rotational torque is produced, the field is said
to be rotating (Eg> for a 3ph supply given to an
alternator.)

WHen no net rotational torque is produced due to the fact
that Fwd and Bwd torques are Equeal and Opp.,(Eg: in case
of a single phase(not split phase) supply given to a single
phase motor), then magn field is pulsating.

Answer / rajendran

when a three phase supply is applied to a machine then a
rotating magnetic field is established..... it means the
resulatant force due to the magnetic fields creates an
effect equal to that of an magnetic pole pair is rotated at
synchronous speed.

so we call it as RMF.

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