Synchronous Motors
If the field circuit of an unloaded salientpole synchronous motor gets suddenly open-circuited, then

it continues to run at the same speed
it runs at a slower speed
it runs at a very high speed
the motor stops

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

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