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| View Original: | Laminated core eddy currents 2.svg (1082x468) | |||
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| Keywords: Laminated core eddy currents 2.svg laminated core in a transformer prevents power losses due to eddy current s The alternating current in the transformer's winding creates an alternating magnetic field <span style color green; >B green arrows</span> within the transformer's steel core Since the core is electrically conductive the field induces circulating loops of electric current in the core <span style color red; >red lines</span> called eddy current s due to Faraday's law of induction which flow in planes perpendicular to the field The current flowing through the resistance of the core dissipates energy as heat causing power losses To reduce the power losses instead of a solid core left many transformers use a laminated core right The core is made of a stack of thin steel laminations with a nonconductive coating on the surface The eddy currents can't cross from one lamination to the next so the only eddy currents that can flow must flow within the thickness of each individual lamination Since the magnitude of the current is proportional to the area enclosed by the loop this reduces the eddy currents greatly and thus the energy lost in the core In the diagram the magnetic field B and the eddy currents are shown in one direction; they actually reverse direction with each half-cycle of the alternating current 2016-02-03 own Chetvorno other fields + 26 d cc-zero Transformer schemas Eddy currents | ||||
