Reducing Eddy Current Effects: How Laminated Cores and Reduced Area Help

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Discussion Overview

The discussion focuses on the mechanisms by which laminated cores and reduced area can help in reducing eddy currents, particularly in the context of magnetic materials and their applications. Participants explore theoretical and conceptual aspects related to the design and functionality of laminated cores.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant inquires about how laminated cores contribute to the reduction of eddy currents and the role of reduced area in this process.
  • Another participant explains that the orientation of magnetic laminations is crucial to prevent conductive materials from acting as large electrical short-circuited turns, and that the sectional area of the lamination affects the voltage driving eddy currents.
  • This participant also notes that the thickness of laminations relates more to utilizing the mass of the lamination rather than solely to eddy current reduction, emphasizing the importance of frequency in selecting lamination thickness.
  • A third participant expresses confusion regarding the previous explanation and requests further clarification.
  • Another participant suggests consulting a Wikipedia article on eddy currents for more foundational understanding before asking specific questions.
  • One participant uses an analogy of drawing circles within a rectangle to illustrate how reducing the area of conductive material limits the size of eddy currents that can form.

Areas of Agreement / Disagreement

The discussion contains multiple viewpoints regarding the mechanisms of eddy current reduction, with no consensus reached on the best explanations or approaches. Participants express varying levels of understanding and seek clarification on complex concepts.

Contextual Notes

Some assumptions about the relationship between lamination thickness, frequency of operation, and eddy current behavior remain unresolved. The discussion also reflects varying levels of familiarity with the topic among participants.

Who May Find This Useful

This discussion may be useful for individuals interested in electromagnetic theory, materials science, and engineering applications related to magnetic components and eddy currents.

jayeshtrivedi
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Dear All,
How laminated core helps in reduction of the eddy current?
How reduction of area is useful in reduction of eddy current?
Thanks.
 
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Magnetic laminations must be oriented so that conductive material does not act as a large area electrical short circuited turn. The sectional area of lamination penetrated by magnetic field decides the voltage available to drive eddy the currents.

The thickness of laminations is more to do with utilising all the mass of the lamination than with eddy current reduction. The electric and magnetic fields propagate through the insulation between laminations at close to the speed of light. Skin effects on the surface of conductive laminations limit the rate of penetration of the magnetic field. This speed of penetration is very slow and so is measured in metres per second. The thickness of laminations must therefore be selected depending on the frequency of operation, while the orientation of laminations is selected to minimise eddy currents.
 
Hi,

I think am unable to understand the reply, could you please explain in details.

Thanks.

Jayesh Trivedi
 
Think about drawing circles inside a rectangle without going outside the line. If I have a fairly large rectangle then I can draw some big circles. If I squish the rectangle so that it's more like a plate then I can only draw small circles.

When magnetic fields change in time they cause the electric field to curl up. If this happens in a large conductive mass then there will be a large circular current called the eddy current. If you chop that mass up into plates then their won't be as much room for the current to spin around in each individual plate so the eddy currents will be smaller.
 

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