Synchronous Motors
An over excited synchronous motor is used for

Power factor corrections
Fluctuating loads
Low torque loads
Variable speed loads

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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

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

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