eddy current

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Related to Eddy-current: Eddy-current brake, Eddy-current testing

Eddy current

An electric current induced within the body of a conductor when that conductor either moves through a nonuniform magnetic field or is in a region where there is a change in magnetic flux. It is sometimes called Foucault current. Although eddy currents can be induced in any electrical conductor, the effect is most pronounced in solid metallic conductors. Eddy currents are utilized in induction heating and to damp out oscillations in various devices.

It is possible to reduce the eddy currents by laminating the conductor, that is, by building the conductor of many thin sheets that are insulated from each other rather than making it of a single solid piece. The laminations do not reduce the induced emfs, but if they are properly oriented to cut across the paths of the eddy currents, they confine the currents largely to single laminae, where the paths are long, making higher resistance.

eddy current

[′ed·ē ‚kə·rənt]
(electromagnetism)
An electric current induced within the body of a conductor when that conductor either moves through a nonuniform magnetic field or is in a region where there is a change in magnetic flux. Also known as Foucault current.

Eddy current

An electric current induced within the body of a conductor when that conductor either moves through a nonuniform magnetic field or is in a region where there is a change in magnetic flux. It is sometimes called Foucault current. Although eddy currents can be induced in any electrical conductor, the effect is most pronounced in solid metallic conductors. Eddy currents are utilized in induction heating and to damp out oscillations in various devices.

It is possible to reduce the eddy currents by laminating the conductor, that is, by building the conductor of many thin sheets that are insulated from each other rather than making it of a single solid piece. The laminations do not reduce the induced emfs, but if they are properly oriented to cut across the paths of the eddy currents, they confine the currents largely to single laminae, where the paths are long, making higher resistance. See Core loss

References in periodicals archive ?
Deng, "Commutation-caused eddy-current losses in permanent-magnet brushless DC motors," IEEE Transactions on Magnetics, vol.
The magnet eddy-current losses are neglected in the analysis but as the Halbach magnets are highly segmented, these losses will be relatively low [38].
The company has expanded its product offering to include eddy-current displacement sensors and some application specific sensors for the packaging and PCB industries.
Hottenstein agrees that any optical sorting machine needs to be post-shredder, just like the magnet and eddy-current separator.
The MP30 unit is available in two models: the Deltascope MP30, which measures all nonconductive and nonmetallic coatings on iron and steel using the magnetic induction method; and the Isoscope MP30 model, which measures nonconductive coatings on nonferrous base materials using the eddy-current method.
The first electronic sorters used eddy-current sensing.
Another recent study [41] showed that individual contribution of excess and eddy-current losses cannot be separated.
Thermal analysis of an eddy-current heated piece by means of the FEM-DBCI method, COMPEL: The Int.
com)-- The ECL101 Eddy-Current displacement sensor is an improved, CE compliant version of Lion Precision's original ECL100 sensor.
Micro-Epsilon's EC5 combines a capacitive sensor with an eddy-current sensor in a single housing.
As part of this inspection, Luxfer further requires that the cylinder neck be tested with an eddy-current device such as Visual Plus, Visual Eddy or equivalent non-destructive testing equipment.
Tenders are invited for Purchase and commission the automatic eddy-current system to control the metal of the heat exchanging tubes and collector ligaments of steam generator PGV-1000.