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Eddy currents are currents induced in conductors to oppose the change in flux that generated them. It is caused when a conductor is exposed to a changing magnetic field due to relative motion of the field source and conductor; or due to variations of the field with time. This can cause a circulating flow of electrons, or a current, within the body of the conductor.

These circulating eddies of current create induced magnetic fields that oppose the change of the original magnetic field due to Lenz’s law, causing repulsive or drag forces between the conductor and the magnet. The stronger the applied magnetic field, or the greater the electrical conductivity of the conductor, or the faster the field that the conductor is exposed to changes, then the greater the currents that are developed and the greater the opposing field.

The term eddy current comes from analogous currents seen in water when dragging an oar breadthwise: localised areas of turbulence known as eddies give rise to persistent vortices.

Eddy currents, like all electric currents, generate heat as well as electromagnetic forces. The heat can be harnessed for induction heating. The electromagnetic forces can be used for levitation, creating movement, or to give a strong braking effect. Eddy currents can often be minimised with thin plates, by lamination of conductors or other details of conductor shape.

RESOURCE: TutorVista- Online Tutor

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Edvard Csanyi

Edvard - Electrical engineer, programmer and founder of EEP. Highly specialized for design of LV high power busbar trunking (<6300A) in power substations, buildings and industry fascilities. Designing of LV/MV switchgears.Professional in AutoCAD programming and web-design.Present on

10 Comments

  1. […] Eddy currents are electrical currents that flow in the core iron of an AC machine. To generate voltages in takes a magnetic field, conductors and some change between them. […]


  2. MyoZaw
    Dec 27, 2014

    Is this case concern with when we use single core cable passing through gland plate , the gland plate shpuld be aluminum gland plate , also we use awa armor in single core cable

  3. […] Eddy Current heating results from the I2R losses of induced currents circulating in metalwork, which is not part of the defined conductor system. The use of non magnetic, low resistance materials such as Aluminium and Brass for single core cable gland plates and equipment mounting back plates (e.g. for circuit breakers above 630A) will reduce this source of heat and is advisable. […]

  4. […] There are four internal losses that contribute to lower efficiency of a DC generator.Copper lossesEddy-current lossesHysteresis lossesMechanical lossesTopCopper LossesCopper loss is the power lost as heat in the […]

  5. […] one or more pieces of specially-shaped soft iron, which are so pivoted as to be acted upon by the magnetic field produced by the current in coil.There are two general types of moving-iron instruments namely:1. […]

  6. […] energy by the load.The time varying (sinusoidal) fluxes produced by shunt and series magnet induce eddy currents in the aluminium disc.The interaction between these two magnetic fields and eddy currents set up a […]

  7. […] The iron loss is due to stray eddy currents formed in the transformer core. Lines of flux are formed around the current-carrying […]

  8. […] load loss depends on the harmonic frequency and the way the transformer is designed.In general, the eddy current loss increases by the square of the frequency and the square of the load current. So, if the load […]

  9. […] core is comprised of thin silicon steel laminations and insulated by a surface coating minimizing eddy current and hysteresis losses generated by alternating magnetism. The laminations are stacked as full rings […]

  10. […] (point d), the flux change is also the greatest at those times.Consequently, the self-induced EMF (electromagnetic field) in the coil is at its maximum (or minimum) value at these points, as shown in Figure 1.Because the […]

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