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Under variable frequency operation of 3 phase Induction motor, air gap flux is kept constant by adjusting the motor voltage. For constant air gap flux, machine develops the same torque when the
- a)slip is kep constant
- b)Slip speed is kept constant
- c)power flow across the air gap is kept
- d)power input to the stator is kept constant.
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Under variable frequency operation of 3 phase Induction motor, air gap...
In low slip region (stable region)
Slip speed = SNs = Ns – Nr
Ns ∝ f
Slip speed, SNs → Constant
Most Upvoted Answer
Under variable frequency operation of 3 phase Induction motor, air gap...
Explanation:
Under variable frequency operation of a 3-phase induction motor, the air gap flux is kept constant by adjusting the motor voltage. This is necessary because the air gap flux is directly proportional to the motor voltage. By keeping the air gap flux constant, the motor can operate efficiently and develop the same torque.
Constant Air Gap Flux:
When the air gap flux is kept constant, it means that the magnetic field strength in the air gap remains the same regardless of the operating frequency. This is achieved by adjusting the motor voltage in proportion to the frequency, as the air gap flux is directly proportional to the motor voltage.
Torque Development:
The torque developed by an induction motor is directly proportional to the slip speed. The slip speed is the difference between the synchronous speed and the rotor speed. In order to maintain the same torque, the slip speed must be kept constant.
Slip Speed:
The slip speed is the difference between the synchronous speed and the rotor speed. As the frequency of the power supply changes, the synchronous speed also changes. In order to keep the slip speed constant, the rotor speed must be adjusted accordingly. This can be achieved by adjusting the motor voltage to maintain a constant air gap flux.
Power Flow and Input:
Power flow across the air gap and power input to the stator are not directly related to the torque developed by the motor. While they are important factors in motor operation, they do not affect the torque development in the same way as slip speed does.
Conclusion:
In conclusion, under variable frequency operation, the same torque can be developed by keeping the slip speed constant. This is achieved by adjusting the motor voltage to maintain a constant air gap flux. By doing so, the motor can operate efficiently and maintain consistent torque output.
Under variable frequency operation of a 3-phase induction motor, the air gap flux is kept constant by adjusting the motor voltage. This is necessary because the air gap flux is directly proportional to the motor voltage. By keeping the air gap flux constant, the motor can operate efficiently and develop the same torque.
Constant Air Gap Flux:
When the air gap flux is kept constant, it means that the magnetic field strength in the air gap remains the same regardless of the operating frequency. This is achieved by adjusting the motor voltage in proportion to the frequency, as the air gap flux is directly proportional to the motor voltage.
Torque Development:
The torque developed by an induction motor is directly proportional to the slip speed. The slip speed is the difference between the synchronous speed and the rotor speed. In order to maintain the same torque, the slip speed must be kept constant.
Slip Speed:
The slip speed is the difference between the synchronous speed and the rotor speed. As the frequency of the power supply changes, the synchronous speed also changes. In order to keep the slip speed constant, the rotor speed must be adjusted accordingly. This can be achieved by adjusting the motor voltage to maintain a constant air gap flux.
Power Flow and Input:
Power flow across the air gap and power input to the stator are not directly related to the torque developed by the motor. While they are important factors in motor operation, they do not affect the torque development in the same way as slip speed does.
Conclusion:
In conclusion, under variable frequency operation, the same torque can be developed by keeping the slip speed constant. This is achieved by adjusting the motor voltage to maintain a constant air gap flux. By doing so, the motor can operate efficiently and maintain consistent torque output.
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Under variable frequency operation of 3 phase Induction motor, air gap flux is kept constant by adjusting the motor voltage. For constant air gap flux, machine develops the same torque when thea)slip is kep constantb)Slip speed is kept constantc)power flow across the air gap is keptd)power input to the stator is kept constant.Correct answer is option 'B'. Can you explain this answer?
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Under variable frequency operation of 3 phase Induction motor, air gap flux is kept constant by adjusting the motor voltage. For constant air gap flux, machine develops the same torque when thea)slip is kep constantb)Slip speed is kept constantc)power flow across the air gap is keptd)power input to the stator is kept constant.Correct answer is option 'B'. 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 Under variable frequency operation of 3 phase Induction motor, air gap flux is kept constant by adjusting the motor voltage. For constant air gap flux, machine develops the same torque when thea)slip is kep constantb)Slip speed is kept constantc)power flow across the air gap is keptd)power input to the stator is kept constant.Correct answer is option 'B'. 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 Under variable frequency operation of 3 phase Induction motor, air gap flux is kept constant by adjusting the motor voltage. For constant air gap flux, machine develops the same torque when thea)slip is kep constantb)Slip speed is kept constantc)power flow across the air gap is keptd)power input to the stator is kept constant.Correct answer is option 'B'. Can you explain this answer?.
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