titel | Testkit Magnaflux Corporation voor eddy current |
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inventarisnummer | MLD/0507 |
collectie | Historische Verzameling Marineluchtvaartdienst |
museum | Marinemuseum Den Helder |
maker | Magnaflux Corporation |
omschrijving | Testkit voor materiaal onderzoek / eddy current. Blauw aluminium kistje met aan de voorzijde een zwart kunststof greepje. Bovenop een fabrieksplaatje: Magnaflux Corporation. Met een scharnierend deksel. In de deksel opbergruimte voor het snoer. In de kist een helblauwe plaat met in het midden een wijzerplaatje met fabrieksaanduiding Magnaflux corporation. Boven de wijzerplaat staat: Magnaflux ED-520 Eddy Current instrument. Met diverse knoppen met aanduidingen erbij. Serial no. 75383, model ED-520. An eddy current (also known as Foucault current) is an electrical phenomenon discovered by French physicist Léon Foucault in 1851. 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 conductor. These circulating eddies of current create electromagnets with magnetic fields that opposes the change of the magnetic field (see Lenz's law). 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. |
afmetingen | hoogte 12 cm breedte 23 cm diepte 16 cm |
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