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Consider the following statements:
The use of inter-poles in dc machines is to counteract the
1. Reactance voltage
2. Demagnetizing effect of armature mmf in the commutating zone
3. Cross-magnetizing effect of armature mmf in the commutating zone
Which of these statement(s) is/are correct?
- a)1 and 2
- b)2 and 3
- c)1 and 3
- d)3 alone
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Consider the following statements:The use of inter-poles in dc machine...
The inter-poles of appropriate polarity are strengthened so that in inter-pole zone, the cross- magnetizing effect of armature mmf is neutralized and in addition some flux is produced there. This additional flux in the inter-pole zone induces rotational emf in the commutated coil in such a direction as to oppose the reactance voltage.
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Consider the following statements:The use of inter-poles in dc machine...
Understanding Inter-poles in DC Machines
Inter-poles, or commutating poles, are essential components in DC machines that serve specific functions in enhancing performance. Their main role is to counteract the adverse effects caused by the armature current during commutation.
Key Functions of Inter-poles:
- Counteracting Demagnetizing Effect:
The armature current generates a magnetic field that opposes the main field in the commutating zone, creating a demagnetizing effect. This can lead to poor commutation, causing sparking at the brushes. Inter-poles provide a corrective magnetic field that helps neutralize this demagnetizing effect.
- Dealing with Cross-magnetizing Effect:
In addition to the demagnetizing effect, the armature current also creates a cross-magnetizing effect. This effect distorts the main magnetic field, which can further complicate commutation. Inter-poles are designed to counteract this effect, ensuring a smoother transition during commutation.
Evaluation of Statements:
1. Reactance Voltage:
- The first statement regarding reactance voltage is not primarily related to the function of inter-poles. Reactance voltage pertains to the inductive properties of the windings, which inter-poles do not specifically address.
2. Demagnetizing Effect of Armature MMF:
- The second statement is correct. Inter-poles effectively counteract the demagnetizing effect of armature magnetomotive force (MMF), ensuring better commutation performance.
3. Cross-magnetizing Effect of Armature MMF:
- The third statement is also correct. Inter-poles mitigate the cross-magnetizing effect, helping maintain the integrity of the magnetic field during operation.
Conclusion:
Given this analysis, the correct statements are 2 and 3, making the answer option 'C' correct. Inter-poles play a pivotal role in enhancing the efficiency and reliability of DC machines by addressing these key challenges.
Inter-poles, or commutating poles, are essential components in DC machines that serve specific functions in enhancing performance. Their main role is to counteract the adverse effects caused by the armature current during commutation.
Key Functions of Inter-poles:
- Counteracting Demagnetizing Effect:
The armature current generates a magnetic field that opposes the main field in the commutating zone, creating a demagnetizing effect. This can lead to poor commutation, causing sparking at the brushes. Inter-poles provide a corrective magnetic field that helps neutralize this demagnetizing effect.
- Dealing with Cross-magnetizing Effect:
In addition to the demagnetizing effect, the armature current also creates a cross-magnetizing effect. This effect distorts the main magnetic field, which can further complicate commutation. Inter-poles are designed to counteract this effect, ensuring a smoother transition during commutation.
Evaluation of Statements:
1. Reactance Voltage:
- The first statement regarding reactance voltage is not primarily related to the function of inter-poles. Reactance voltage pertains to the inductive properties of the windings, which inter-poles do not specifically address.
2. Demagnetizing Effect of Armature MMF:
- The second statement is correct. Inter-poles effectively counteract the demagnetizing effect of armature magnetomotive force (MMF), ensuring better commutation performance.
3. Cross-magnetizing Effect of Armature MMF:
- The third statement is also correct. Inter-poles mitigate the cross-magnetizing effect, helping maintain the integrity of the magnetic field during operation.
Conclusion:
Given this analysis, the correct statements are 2 and 3, making the answer option 'C' correct. Inter-poles play a pivotal role in enhancing the efficiency and reliability of DC machines by addressing these key challenges.
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Consider the following statements:The use of inter-poles in dc machines is to counteract the1. Reactance voltage2. Demagnetizing effect of armature mmf in the commutating zone3. Cross-magnetizing effect of armature mmf in the commutating zoneWhich of these statement(s) is/are correct?a)1 and 2b)2 and 3c)1 and 3d)3 aloneCorrect answer is option 'C'. Can you explain this answer?
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