Synchronous Motors
A rotary converter can also be run as a

Dc compound generator
Synchronous motor
Dc shunt generator
Dc series generator

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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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