Synchronous Motors
A synchronous machine with low value short circuit ratio has

High stability limit
Good speed regulation
Lower stability limit
Good voltage regulation

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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

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

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