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Skewing of the rotor in a three-phase squirrel-cage induction motor reduces
- a)Noise, parasitic torque, starting torque and pullout torque
- b)Noise and parasitic torque, but increase starting torque and pollout torque
- c)Noise and pollout torque, but increase parasitic torque and starting torque
- d)Noise parasitic torque and starting torque, but increased pullout torque
Correct answer is option 'A'. Can you explain this answer?
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Skewing of the rotor in a three-phase squirrel-cage induction motor re...
If the rotor slots are skewed then the effect of slot harmonics (parasitic torques) can be eliminated.
Since the skewed rotor slot is not parallel to start slot in an induction motor, there is more leakage reactance. As a result, induction motor has lower starting and maximum torques.
With skewed rotor bars, the revolving flux, in effect, encounters an air gap of uniform reluctance and this results in a uniform torque and quieter operation.
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Skewing of the rotor in a three-phase squirrel-cage induction motor re...
Understanding Rotor Skewing
Rotor skewing in three-phase squirrel-cage induction motors is a design technique applied to improve performance and reduce undesirable effects. Here's a detailed explanation of how skewing benefits motor operation:
Reduction of Noise
- Skewing the rotor helps to minimize the magnetic hum produced during operation.
- This is achieved by spreading the magnetic forces over a larger area, leading to smoother torque production.
Decrease in Parasitic Torque
- Parasitic torque, which is unwanted torque causing vibrations, is reduced through rotor skewing.
- The distribution of magnetic fields becomes more uniform, lowering the chances of vibrations and resonance.
Impact on Starting Torque
- Starting torque is positively influenced by rotor skewing, as it allows for a more gradual buildup of torque.
- Skewing creates a more favorable magnetic interaction during startup, enhancing the motor's ability to overcome inertia.
Enhancement of Pull-Out Torque
- Pull-out torque, the maximum torque at which the motor can operate without stalling, is also increased with rotor skewing.
- The improved torque characteristics contribute to higher reliability under varying load conditions.
Conclusion
In summary, rotor skewing in a three-phase squirrel-cage induction motor effectively reduces noise and parasitic torque while enhancing starting and pull-out torque. This design choice leads to a more efficient and reliable motor operation, making it a preferred technique in electrical engineering applications.
Rotor skewing in three-phase squirrel-cage induction motors is a design technique applied to improve performance and reduce undesirable effects. Here's a detailed explanation of how skewing benefits motor operation:
Reduction of Noise
- Skewing the rotor helps to minimize the magnetic hum produced during operation.
- This is achieved by spreading the magnetic forces over a larger area, leading to smoother torque production.
Decrease in Parasitic Torque
- Parasitic torque, which is unwanted torque causing vibrations, is reduced through rotor skewing.
- The distribution of magnetic fields becomes more uniform, lowering the chances of vibrations and resonance.
Impact on Starting Torque
- Starting torque is positively influenced by rotor skewing, as it allows for a more gradual buildup of torque.
- Skewing creates a more favorable magnetic interaction during startup, enhancing the motor's ability to overcome inertia.
Enhancement of Pull-Out Torque
- Pull-out torque, the maximum torque at which the motor can operate without stalling, is also increased with rotor skewing.
- The improved torque characteristics contribute to higher reliability under varying load conditions.
Conclusion
In summary, rotor skewing in a three-phase squirrel-cage induction motor effectively reduces noise and parasitic torque while enhancing starting and pull-out torque. This design choice leads to a more efficient and reliable motor operation, making it a preferred technique in electrical engineering applications.
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Skewing of the rotor in a three-phase squirrel-cage induction motor reducesa)Noise, parasitic torque, starting torque and pullout torqueb)Noise and parasitic torque, but increase starting torque and pollout torquec)Noise and pollout torque, but increase parasitic torque and starting torqued)Noise parasitic torque and starting torque, but increased pullout torqueCorrect answer is option 'A'. Can you explain this answer?
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