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Synchrounous motor is three phase motor,but its not self
starting .why?
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Answer Posted / prasanth
"A synchronous motor is not a self starting motor because
torque is developed when running at synchronous
speed,therefore,the motor needs some type of device to
bring the rotor to synchronous speed."
EXPLAINATION:
As per operating principle of synchronous
motor,due to continuous and rapid rotation of stator
poles,the rotor is subjected to a torque which tends to
move it first in one direction and then in the opposite
direction.Owing to its large inertia,the rotor cannot
instantaneously respond to such quickly reversing
torque,with the result that it remains stationary or in
other words it is not self starting.
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