Air gap flux density in DC machine

  • Thread starter swayam007
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Why is it that the air gap flux density is flat topped at no load. What happens to it's shape when machine is loaded?
 

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jim hardy
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Is flux = mmf/reluctance? Is air gap constant under pole piece?


Have you looked up "Armature Reaction" ?

Unloaded, the only MMF is that from the field current. When armature current begins to flow, armature mmf changes shape flux .

Surely your textbook shows diagrams...
 

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