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File:Laminated core eddy currents 2.svg

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English: Diagram showing how a laminated core in a transformer prevents power losses due to eddy currents. The drawing at left shows a solid iron transformer core. The alternating current in the transformer's winding (not shown) creates an alternating magnetic field (B, green arrows) within the transformer's steel core. Since the core is electrically conductive, the field induces circulating loops of electric current in the core (red lines) called eddy currents due to Faraday's law of induction, which flow in planes perpendicular to the field. The current flowing through the resistance of the core dissipates energy as heat, causing power losses. To reduce the power losses, instead of a solid core (left) many transformers use a laminated core (right). The core is made of a stack of thin steel laminations, with a nonconductive coating on the surface. The eddy currents can't cross from one lamination to the next, so the only eddy currents that can flow must flow within the thickness of each individual lamination. Since the magnitude of the current is proportional to the area enclosed by the loop, this reduces the eddy currents greatly and thus the energy lost in the core.
In the diagram, the magnetic field B and the eddy currents are shown in one direction; they actually reverse direction with each half-cycle of the alternating current.
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Author Chetvorno
SVG developmentW3C grn.svg The source code of this SVG is valid.Inkscape-yes.svg This diagram was created with Inkscape, or with something else.Add Language.svg   This SVG diagram uses embedded text that can be easily translated.

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3 February 2016

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Date/TimeThumbnailDimensionsUserComment
current03:58, 9 May 2017Thumbnail for version as of 03:58, 9 May 20171,132 × 539 (22 KB)ChetvornoReplaced invalid Inkscape SVG version with "plain SVG" version that passes validation
18:32, 3 February 2016Thumbnail for version as of 18:32, 3 February 20161,132 × 539 (29 KB)ChetvornoUser created page with UploadWizard
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