Synchronous Motors
A synchronous machine with large air gap has

a higher value of stability limit
a higher synchronizing power which makes the machine less sensitive to load variations
a small value of inherent regulation
all of the listed here

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

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