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When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop
- a)inductor motor torque
- b)induction generator torque
- c)synchronous motor torque
- d)d.c. motor toque
Correct answer is option 'B'. Can you explain this answer?
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When the rotor speed, in a synchronous machine, becomes more than the ...
- When the rotor speed in a synchronous machine becomes more than the synchronous speed during hunting, the damper bars develop induction generator torque.
- Hunting refers to a phenomenon in which the rotor of a synchronous machine oscillates around the synchronous speed due to sudden load changes or disturbances in the system. During hunting, the rotor speed may temporarily exceed the synchronous speed.
- Damper bars are the conductive bars or copper loops embedded in the rotor of a synchronous machine. These bars are used to provide damping and improve stability during transient conditions.
- When the rotor speed exceeds the synchronous speed, the damper bars develop induction generator torque. The rotor speed higher than the synchronous speed creates a relative speed difference between the rotating magnetic field produced by the stator and the rotor conductors. This speed difference induces currents in the damper bars, which, in turn, generate torque opposing the motion and acting as an induction generator.
- Induction generator torque is a type of torque that opposes the motion and helps bring the rotor speed back towards the synchronous speed. It provides damping and stability to the rotor during hunting conditions, preventing excessive speed deviations.
- Options A (inductor motor torque), C (synchronous motor torque), and D (DC motor torque) are not applicable in this scenario as they do not describe the torque developed by the damper bars during hunting when the rotor speed exceeds the synchronous speed.
- Therefore, the correct answer is B) induction generator torque.
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Induction Generator Torque Explanation:
Induction generator torque is developed in the damper bars of a synchronous machine when the rotor speed becomes more than the synchronous speed during hunting. This phenomenon occurs due to the mechanical forces acting on the rotor causing it to accelerate beyond the synchronous speed.
Causes of Hunting:
- Hunting in a synchronous machine can be caused by sudden changes in load, disturbances in the system, or improper control of the machine.
- When the rotor speed exceeds the synchronous speed, the machine experiences oscillations known as hunting.
Damper Bars Function:
- Damper bars are used in synchronous machines to prevent hunting by providing damping torque.
- When the rotor speed exceeds the synchronous speed, the damper bars develop induction generator torque to help stabilize the machine and bring the rotor back to the synchronous speed.
Induction Generator Torque:
- Induction generator torque is developed in the damper bars due to the relative motion between the stator magnetic field and the rotor conductors.
- This torque helps to slow down the rotor and bring it back to the synchronous speed, thereby stabilizing the machine during hunting.
In conclusion, during hunting in a synchronous machine, the damper bars develop induction generator torque to counteract the effects of the rotor speed exceeding the synchronous speed and help stabilize the machine.
Induction generator torque is developed in the damper bars of a synchronous machine when the rotor speed becomes more than the synchronous speed during hunting. This phenomenon occurs due to the mechanical forces acting on the rotor causing it to accelerate beyond the synchronous speed.
Causes of Hunting:
- Hunting in a synchronous machine can be caused by sudden changes in load, disturbances in the system, or improper control of the machine.
- When the rotor speed exceeds the synchronous speed, the machine experiences oscillations known as hunting.
Damper Bars Function:
- Damper bars are used in synchronous machines to prevent hunting by providing damping torque.
- When the rotor speed exceeds the synchronous speed, the damper bars develop induction generator torque to help stabilize the machine and bring the rotor back to the synchronous speed.
Induction Generator Torque:
- Induction generator torque is developed in the damper bars due to the relative motion between the stator magnetic field and the rotor conductors.
- This torque helps to slow down the rotor and bring it back to the synchronous speed, thereby stabilizing the machine during hunting.
In conclusion, during hunting in a synchronous machine, the damper bars develop induction generator torque to counteract the effects of the rotor speed exceeding the synchronous speed and help stabilize the machine.
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When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars developa)inductor motor torqueb)induction generator torquec)synchronous motor torqued)d.c. motor toqueCorrect answer is option 'B'. Can you explain this answer?
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