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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 increases starting torque and pullout torque
- c)noise and pullout torque, but increases parasitic torque and starting torque
- d)noise, parasitic torque and starting torque, but increases 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 rotor slots are skewed by 2 harmonic pole-pitches, then the effect of slot harmonics (Parasitic torques) can be eliminated.
Since the skewed rotor slot is not parallel to stator 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...
Skewing of the rotor in a three-phase squirrel-cage induction motor reduces:
Skewing of the rotor in a three-phase squirrel-cage induction motor is a technique used to reduce certain undesirable effects and improve the performance of the motor. It involves slightly tilting or skewing the rotor bars in order to eliminate or minimize the negative effects caused by magnetic field harmonics and rotor eccentricity.
The main advantages of skewing the rotor in a three-phase squirrel-cage induction motor are:
Noise:
- Skewing the rotor helps to reduce noise levels in the motor operation. This is because the skewing technique helps to decrease the magnetic noise produced by the interaction between the stator and rotor magnetic fields. By tilting the rotor bars, the magnetic field harmonics are reduced, resulting in smoother and quieter motor operation.
Parasitic Torque:
- Skewing the rotor also helps to reduce parasitic torque in the motor. Parasitic torque is the additional torque generated due to the interaction between the rotor magnetic field and the stator magnetic field. By skewing the rotor, the magnetic interaction is improved, leading to a reduction in the parasitic torque. This results in improved motor efficiency and performance.
Starting Torque:
- Skewing the rotor can also enhance the starting torque of the motor. The skewed rotor design helps to improve the alignment of the magnetic fields during motor starting, which leads to increased starting torque. This is particularly beneficial in applications where high starting torque is required, such as in heavy machinery or equipment.
Pullout Torque:
- Skewing the rotor also helps to improve the pullout torque of the motor. Pullout torque is the maximum torque that a motor can produce without stalling or losing synchronization. By skewing the rotor, the magnetic field distribution is improved, resulting in higher pullout torque capabilities. This is advantageous in applications where the motor needs to operate under high load conditions or during sudden changes in load.
In conclusion, skewing the rotor in a three-phase squirrel-cage induction motor offers several benefits, including reduced noise levels, decreased parasitic torque, increased starting torque, and improved pullout torque. These advantages contribute to improved motor performance, efficiency, and reliability.
Skewing of the rotor in a three-phase squirrel-cage induction motor is a technique used to reduce certain undesirable effects and improve the performance of the motor. It involves slightly tilting or skewing the rotor bars in order to eliminate or minimize the negative effects caused by magnetic field harmonics and rotor eccentricity.
The main advantages of skewing the rotor in a three-phase squirrel-cage induction motor are:
Noise:
- Skewing the rotor helps to reduce noise levels in the motor operation. This is because the skewing technique helps to decrease the magnetic noise produced by the interaction between the stator and rotor magnetic fields. By tilting the rotor bars, the magnetic field harmonics are reduced, resulting in smoother and quieter motor operation.
Parasitic Torque:
- Skewing the rotor also helps to reduce parasitic torque in the motor. Parasitic torque is the additional torque generated due to the interaction between the rotor magnetic field and the stator magnetic field. By skewing the rotor, the magnetic interaction is improved, leading to a reduction in the parasitic torque. This results in improved motor efficiency and performance.
Starting Torque:
- Skewing the rotor can also enhance the starting torque of the motor. The skewed rotor design helps to improve the alignment of the magnetic fields during motor starting, which leads to increased starting torque. This is particularly beneficial in applications where high starting torque is required, such as in heavy machinery or equipment.
Pullout Torque:
- Skewing the rotor also helps to improve the pullout torque of the motor. Pullout torque is the maximum torque that a motor can produce without stalling or losing synchronization. By skewing the rotor, the magnetic field distribution is improved, resulting in higher pullout torque capabilities. This is advantageous in applications where the motor needs to operate under high load conditions or during sudden changes in load.
In conclusion, skewing the rotor in a three-phase squirrel-cage induction motor offers several benefits, including reduced noise levels, decreased parasitic torque, increased starting torque, and improved pullout torque. These advantages contribute to improved motor performance, efficiency, and reliability.
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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 increases starting torque and pullout torquec)noise and pullout torque, but increases parasitic torque and starting torqued)noise, parasitic torque and starting torque, but increases pullout torqueCorrect 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 reducesa)noise, parasitic torque, starting torque and pullout torqueb)noise and parasitic torque but increases starting torque and pullout torquec)noise and pullout torque, but increases parasitic torque and starting torqued)noise, parasitic torque and starting torque, but increases pullout torqueCorrect answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about 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 increases starting torque and pullout torquec)noise and pullout torque, but increases parasitic torque and starting torqued)noise, parasitic torque and starting torque, but increases pullout torqueCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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 increases starting torque and pullout torquec)noise and pullout torque, but increases parasitic torque and starting torqued)noise, parasitic torque and starting torque, but increases pullout torqueCorrect answer is option 'A'. Can you explain this answer?.
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