Synchronous Motors
If one phase of a 3 phase synchronous motor is short circuited, motor

Will not come upto speed
Will refused ro start
Will fail to pull into step
Will overheat in spots

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Synchronous Motors
While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by

induction motor torque in damper winding
All of the listed here
induction motor torque in field winding
eddy current and hysteresis torque in pole faces

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