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Answer Posted / j@ru ( sati)
actually when we supply the 3 phase power to stator of the
m\c than a rotating magnetic field rotates in the air gap
with synchronous speed .(N=120f/p).this rotating field
sweeps the rotor due to inertia of rotor.(means rotor
initially remains in stationary and field doesnt able to
rotate it.)sowe need a dc excitation to rotor .for low speed
dc excitation,for medium and high speed we need thyristor
based brush less excitation.
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