Synchronous Motors
The angle between the rotor poles and stator poles, in a synchronous motor, is known as

Angle of retardation
Power factor angle
Synchronising angle
Torque angle

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

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