Synchronous Motors
Mostly, synchronous motors are of

Salient pole type machines
Smooth cylindrical type machines
Induction type machines
Alternator type machines

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

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