Relation between current and flux

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SUMMARY

The discussion centers on the relationship between magnetic flux and current in electrical systems, particularly in motors. It is established that voltage or electromotive force (emf) is proportional to the negative change in magnetic flux, indicating that the voltage graph represents the negative derivative of the flux graph. The equation Φ=LI, where L is the inductance, confirms that magnetic flux (Φ) is directly proportional to current (I) in the absence of magnetic saturation. Thus, under these conditions, the graphs of current and flux will exhibit similar shapes over time.

PREREQUISITES
  • Understanding of electromagnetic induction principles
  • Familiarity with the equation Φ=LI in electrical circuits
  • Knowledge of magnetic saturation effects in inductive components
  • Basic grasp of voltage and current relationships in electrical systems
NEXT STEPS
  • Study the principles of electromagnetic induction in detail
  • Explore the effects of magnetic saturation on inductors and transformers
  • Learn about the characteristics of different types of electric motors
  • Investigate the mathematical modeling of current and flux relationships in circuits
USEFUL FOR

Electrical engineers, physics students, and anyone interested in the principles of electromagnetism and their applications in motor design and analysis.

TT0
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So I learned that voltage/emf is proportional to the negative change in flux so the graph of the voltage is the negative derivative of the flux graph.

What is the relation between flux and current. In a motor, a change in flux induces a current that creates an opposing magnetic field, and since current is proportional to magnetic field strength, does that mean flux is proportional to current in the coil. So does this mean current and flux will have a similar shaped graph over time?

Thanks
 
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I didn't follow your motor example. Which motor are you talking about?
TT0 said:
So does this mean current and flux will have a similar shaped graph over time?
Yes, but only if there is no magnetic saturation.

Φ=LI, where L is the inductance of the coil, which is a constant.
So, flux∝current.
 

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