Pole Changing Method: Understanding the Confusion

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SUMMARY

The discussion centers on the confusion surrounding the pole changing method in electrical engineering, specifically regarding the interpretation of diagrams depicting coils a1a1' and a2a2'. Participants clarify that the dots and crosses in the diagrams indicate the direction of the magnetic field, not the current. The right-hand rule is referenced to explain the relationship between current direction and magnetic field orientation. The consensus is that both coils are indeed part of the same loop, and understanding the accompanying text is crucial for accurate interpretation.

PREREQUISITES
  • Understanding of electromagnetic theory
  • Familiarity with the right-hand rule in electromagnetism
  • Knowledge of coil configurations in electrical circuits
  • Basic principles of magnetic fields and current direction
NEXT STEPS
  • Study the right-hand rule in detail for electromagnetic applications
  • Explore the concept of magnetic fields generated by current-carrying coils
  • Review diagrams of coil configurations in electrical engineering textbooks
  • Investigate the implications of pole changing methods in motor design
USEFUL FOR

Electrical engineering students, educators, and professionals involved in motor design and electromagnetic theory will benefit from this discussion.

ranju
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I was going through pole changing methods , when I was studying this given figure , I am quite confused in it.. in the text a1a1' & a2a2' are considered as 2 separate coils & it is assumed that both coils are carrying clockwise current , then what that "dot" & "cross" denoting?? Is it the magnetic field according to right hand thumb rule..?? But then why in a1' & a2' the direction is outwards.. as according to right hand rule it'll be inside the plane only ..!
 

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You should read the diagrams in the context of the accompanying text. What does it say?

I think you'll find that a2 and a2' are two parts of the same loop of wire. The dot and cross indicate the direction of the current in the wire.
But I cannot see the circulation arrows properly to verify.
 
In the context it is assumed that current is circulating in clockwise direction in both the coils a1a1' & a2a2' . dot & cross can't denote current then , it must be the field.>!
 

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