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In electromagnetism, an eddy current (also called Foucault's current) is a loop of electric current induced within conductors by a changing magnetic field in the conductor according to Faraday's law of induction or by the relative motion of a conductor in a magnetic field. Eddy currents flow in closed loops within conductors, in planes ...
Eddy Current Testing at Level 2, International Atomic Energy Agency, Vienna, 2011 (pdf 5.6 MB). ASTM E3052 Standard Practice for Examination of Carbon Steel Welds Using Eddy Current Array Official web page of Lorentz Force Velocimetry and Lorentz Force Eddy Current Testing Group Archived 2013-11-17 at the Wayback Machine
However eddy currents induced in the metal magnetic cores of transformers and AC motors and generators are undesirable since they dissipate energy (called core losses) as heat in the resistance of the metal. Cores for these devices use a number of methods to reduce eddy currents: Cores of low frequency alternating current electromagnets and ...
These are called eddy currents. On the lefthand side nearest to the other wire (1) the eddy current is in the opposite direction to the main current (big pink arrow) in the wire, so it subtracts from the main current, reducing it. On the righthand side (2) the eddy current is in the same direction as the main current so it adds to it ...
Cause of skin effect. A main current I flowing through a conductor induces a magnetic field H.If the current increases, as in this figure, the resulting increase in H induces separate, circulating eddy currents I W which partially cancel the current flow in the center and reinforce it near the skin.
If a change in the magnetic field of current i 1 induces another electric current, i 2, the direction of i 2 is opposite that of the change in i 1. If these currents are in two coaxial circular conductors ℓ 1 and ℓ 2 respectively, and both are initially 0, then the currents i 1 and i 2 must counter-rotate. The opposing currents will repel ...
Jumping rings lift when an AC current energises a coil and the electrodynamic forces pushes the rings upwards against gravity. Electrodynamic suspension (EDS) is a form of magnetic levitation in which there are conductors which are exposed to time-varying magnetic fields.
The AC current in the electric coil generates eddy current on the surface of the material. According to the theory of electromagnetic induction, the distribution of the eddy current is only at a very thin layer of the material, called skin depth. This depth reduces with the increase of AC frequency, the material conductivity, and permeability.