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Also known as Foucault currents or parasite currents. They were discovered by Leon Foucault.
When a variable magnetic field goes through an electrical conductor eddy currents are generated. This currents also generate magnetic fields opposed to the original ones.
Eddy currents can be used as electromagnetic brakes, metal separation systems at recycling processes, metal detectors and induction stoves.
Eddy currents produce losses in form of heat at transformer and electric motors cores. This is why instead of a solid block they are composed of many stuck plates, electrically insulated one by one.
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