enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Eddy current - Wikipedia

    en.wikipedia.org/wiki/Eddy_current

    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 ...

  3. Eddy-current testing - Wikipedia

    en.wikipedia.org/wiki/Eddy-current_testing

    In the traditional version of eddy current testing an alternating (AC) magnetic field is used to induce eddy currents inside the material to be investigated. If the material contains a crack or flaw which make the spatial distribution of the electrical conductivity nonuniform, the path of the eddy currents is perturbed and the impedance of the ...

  4. Magnetic core - Wikipedia

    en.wikipedia.org/wiki/Magnetic_core

    (left) Eddy currents (I, red) within a solid iron transformer core. (right) Making the core out of thin laminations parallel to the field (B, green) with insulation between them (C) limits the eddy currents to circulate within each individual lamination, reducing the total current. In this diagram the field and currents are shown in one ...

  5. Skin effect - Wikipedia

    en.wikipedia.org/wiki/Skin_effect

    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.

  6. Proximity effect (electromagnetism) - Wikipedia

    en.wikipedia.org/wiki/Proximity_effect...

    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 ...

  7. List of electromagnetism equations - Wikipedia

    en.wikipedia.org/wiki/List_of_electromagnetism...

    Continuous charge distribution. The volume charge density ρ is the amount of charge per unit volume (cube), surface charge density σ is amount per unit surface area (circle) with outward unit normal nĚ‚, d is the dipole moment between two point charges, the volume density of these is the polarization density P.

  8. Eddy (fluid dynamics) - Wikipedia

    en.wikipedia.org/wiki/Eddy_(fluid_dynamics)

    In fluid dynamics, an eddy is the swirling of a fluid and the reverse current created when the fluid is in a turbulent flow regime. [2] The moving fluid creates a space devoid of downstream-flowing fluid on the downstream side of the object.

  9. Magnetic Reynolds number - Wikipedia

    en.wikipedia.org/wiki/Magnetic_Reynolds_number

    For < the skin effect is negligible and the eddy current braking torque follows the theoretical curve of an induction motor. For R m > 30 {\displaystyle R_{m}>30} the skin effect dominates and the braking torque decreases much slower with increasing speed than predicted by the induction motor model.