When a salient pole 3-phase synchronous motor is started by induction motor action and its field is connected across a field discharge resistance, starting torque is developed by
A. reluctance torque due to saliency of the rotor.
B. eddy current and hysteresis torque in pole faces.
C. induction motor torque in field and damper windings.
D. all of the above.
Answer:D
When a salient pole 3-phase synchronous motor is started by induction motor action and its field is connected across a field discharge resistance, starting torque is developed by
A. reluctance torque due to saliency of the rotor. B. eddy current and hysteresis torque in pole faces. C. induction motor torque in field and damper windings. D. all of the above.