eddy current


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Related to eddy current: Hysteresis loss

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.

McGraw-Hill Concise Encyclopedia of Physics. © 2002 by The McGraw-Hill Companies, Inc.

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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

McGraw-Hill Concise Encyclopedia of Engineering. © 2002 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
* two-dimensional approximation of the magnetic field allows considering the effect of eddy currents in the laminated cores by converting the value of the resistivity of the material.
In the direction of magnetic induction flux, when the sensor is on the defect-free, the induced eddy current is uniform and the peak wave measured by the pickup coil is inherent.
Zetec's MIZ-200A eddy current array instrument features the surface array flex probe with 128 independent channels.
4-6 show the solution of magnetic field density, eddy current density and temperature distribution respectively for certain study case of; 100V input voltage, conductivity=3.5x[10.sup.7] S/m (aluminum), thickness=10mm, and 25[degrees] ambient temperature.
The eddy current clutch uses a fixed electromagnet to avoid the use of carbon brushes and slip rings and enhance clutch reliability.
Minus current density in aircraft skin, as shown in Figure 8, means the eddy current flows in the opposite direction compared with the cable current.
Suppose there is an infinite neodymium iron boron permanent magnet; the external magnetic field is parallel to the surface in the direction of the z-axis; the vortex at a certain point in the permanent magnet can be decomposed into two mutually perpendicular eddy current densities; it can be determined by
The implementation of eddy currents in the industrial sector are proven and established.
In the absence of defect, this inducer generates an eddy current flow which is uniform in intensity and in direction in a large inspection area, as for the actual inducer.
In the paper we limit our analysis to eddy current problem.
[2] investigated the effects of an eddy current damper (ECD) on a cantilever beam.
AC bridge techniques commonly used for precision impedance measurements have been adapted to develop an eddy current sensor for rail defect detection.