Synchrounous motor is three phase motor,but its not self
starting .why?
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Answer Posted / raul
when a 3-phase supply is provided to the stator winding of
the synch motor, a rotating field is produced n adjacent N-
S poles r formed on the stator windings.....due to rotor
inertia the rotor is not able to follow the rotating
magnetic field rotating at synch speed......therefore some
means has to be provided to make it self
starting........the solution lies in this
principle............the rotor is generally of squirrel
cage construction which speeds up as a induction motor and
when the motor picks up speed close to synch speed, the
rotor windings r excited by d.c. thus forming adjacent
poles on the rotor.....and in this way the stator poles
locks in with the rotor poles with opposite polarity to
rotate the rotor at synch speed...........that why synch
motor is DOUBLY EXCITED.
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