DC Electromagnetic Motor-small question

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SUMMARY

The discussion focuses on the operation of a DC electromagnetic motor, specifically addressing the movement of the armature labeled "A" in response to magnetic forces. The participant understands the left-hand rule and the repulsion of north poles but seeks clarification on why the armature moves forward instead of backward. The explanation highlights the importance of the brushes and commutator configuration, indicating that the armature's movement direction is influenced by its orientation and the arrangement of the components in the motor.

PREREQUISITES
  • Understanding of DC electromagnetic motor principles
  • Familiarity with the left-hand rule for magnetic forces
  • Knowledge of commutator and brush configurations in motors
  • Basic concepts of magnetic repulsion and attraction
NEXT STEPS
  • Study the operation of DC motors, focusing on armature dynamics
  • Learn about the role of brushes and commutators in motor performance
  • Explore advanced applications of the left-hand rule in electromagnetic systems
  • Investigate the effects of armature positioning on motor behavior
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Students studying electrical engineering, hobbyists building DC motors, and educators teaching electromagnetic principles will benefit from this discussion.

moshrom
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Homework Statement


[PLAIN]http://img695.imageshack.us/img695/206/95144436.jpg


Homework Equations


Hand rules


The Attempt at a Solution


This is a practice question with the answer already given in the diagram. I know how to draw the coils and use the left hand rule to find the poles. I do not understand b), though. I know the two north poles repel, but why does A move forward instead of backwards?

Thanks.
 
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moshrom said:
I do not understand b), though. I know the two north poles repel, but why does A move forward instead of backwards?

I think it has to do with manner in which the brushes are drawn with respect to the rest of the commutator. See the part of the diagram near where "Front" and "Back" are written.

Imagine what would happen if it moved in each direction (A moved forward, and A moved backwards). Consider the impact of the way the brushes/commutator are drawn.
 
Oh okay, I think I get it. Normally the direction can be determined if the armature is drawn slightly turned. I assumed the 'front' and 'back' labels were written as part of the answer, I guess they were originally given. Thanks.
 

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