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Advantages of eddy currents

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Advantages of eddy currents

Posted by Navdeep Dhaliwal 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 7 years, 1 month ago

Electromagnetic damping : When a metallic frame or plate oscillates in a magnetic field (e.g. in a dead-beat galvanometer), the eddy currents generated in the frame or plate oppose the motion and bring the frame to rest as the oscillations die out quickly. This is called electromagnetic damping.

Magnetic braking : This is provided in electric trains by placing strong electromagnets above the rails. During braking, the metal wheels are exposed to a magnetic field from the electromagnets, generating eddy currents in the wheels. The magnetic interaction between the applied field and the eddy currents acts to slow the wheels down. The faster the wheels are spinning, the stronger the effect, meaning that as the train slows the braking force is reduced, producing a smooth stopping motion.

Electric power meters : The analogue electric power meter (presently most of the electric meters are digital) has a shiny metal disc. This disc rotates due to the eddy currents which are induced in the disc by varying magnetic fields produced by sinusoidally varying currents in a coil.

Induction furnace : In an induction furnace, high frequency alternating current is passed through a coil which surrounds the metals to be melted. The eddy currents generated in the metals produce high temperatures sufficient to melt it.

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