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Why no-load current in the induction motor more than in the transformer?
- a)Mutual flux has to cross the air gap between stator and rotor
- b)Mutual flux completes its path through the iron core
- c)Air gap in induction motor is less
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Why no-load current in the induction motor more than in the transform...
Magnetic circuit of the induction motor has a larger reluctance than the transformer due to the air gap between stator and rotor; more MMF or more current is required to set up working flux in the induction motor.
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Hence, the correct option is (A)
Most Upvoted Answer
Why no-load current in the induction motor more than in the transform...
Explanation:
Mutual flux has to cross the air gap between stator and rotor:
- In an induction motor, the mutual flux has to cross the air gap between the stator and rotor to induce current in the rotor windings, leading to a higher no-load current.
- This air gap presents a higher reluctance compared to the iron core path in a transformer, resulting in increased current flow to establish the necessary magnetic field.
Mutual flux completes its path through the iron core:
- In a transformer, the mutual flux completes its path through the iron core, which offers a lower reluctance path compared to the air gap in an induction motor.
- This lower reluctance path reduces the amount of current needed to establish the magnetic field, resulting in a lower no-load current compared to an induction motor.
Air gap in induction motor is less:
- Contrary to the statement, the air gap in an induction motor is actually larger compared to the iron core path in a transformer.
- This larger air gap in the induction motor contributes to the increased reluctance, requiring more current to establish the magnetic field and leading to a higher no-load current.
Therefore, the primary reason for the higher no-load current in an induction motor compared to a transformer is the need for the mutual flux to cross the air gap between the stator and rotor, which presents a higher reluctance path.
Mutual flux has to cross the air gap between stator and rotor:
- In an induction motor, the mutual flux has to cross the air gap between the stator and rotor to induce current in the rotor windings, leading to a higher no-load current.
- This air gap presents a higher reluctance compared to the iron core path in a transformer, resulting in increased current flow to establish the necessary magnetic field.
Mutual flux completes its path through the iron core:
- In a transformer, the mutual flux completes its path through the iron core, which offers a lower reluctance path compared to the air gap in an induction motor.
- This lower reluctance path reduces the amount of current needed to establish the magnetic field, resulting in a lower no-load current compared to an induction motor.
Air gap in induction motor is less:
- Contrary to the statement, the air gap in an induction motor is actually larger compared to the iron core path in a transformer.
- This larger air gap in the induction motor contributes to the increased reluctance, requiring more current to establish the magnetic field and leading to a higher no-load current.
Therefore, the primary reason for the higher no-load current in an induction motor compared to a transformer is the need for the mutual flux to cross the air gap between the stator and rotor, which presents a higher reluctance path.
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Why no-load current in the induction motor more than in the transformer?a)Mutual flux has to cross the air gap between stator and rotorb)Mutual flux completes its path through the iron corec)Air gap in induction motor is lessd)None of theseCorrect answer is option 'A'. Can you explain this answer?
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