Synchronous Motors
A synchronous machine with large air gap has

a higher synchronizing power which makes the machine less sensitive to load variations
all of the listed here
a higher value of stability limit
a small value of inherent 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
induction motor torque in damper winding
induction motor torque in field winding
All of the listed here

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