While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerating torque is produced by_____________?
Correct answer: E. all of the above methods
- A. induction motor torque in field winding
- B. induction motor torque in damper winding
- C. eddy current and hysteresis torque in pole faces
- D. reHetance motor torque due to saliency of the rotor
- E. all of the above methods
Explanation
During induction starting, current in the damper and field windings produces induction torque, while pole-face losses can add eddy-current and hysteresis torque; rotor saliency also produces reluctance torque. Hence all listed mechanisms may contribute.
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