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| View Original: | Eddy current brake diagram.svg (1690x1139) | |||
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| Keywords: Eddy current brake diagram.svg eddy current brake works Eddy current brakes are used in power tools like circular saws to stop the blade quickly and in electric meters The brake consists of a spinning conductive metal disk D spinning counterclockwise in this example whose surface is positioned between the poles of a magnet N and S The magnetic field B green passing downward through the disk induces circular electric currents I red called eddy currents in the metal of the disk At the leading edge of the magnet left the magnetic flux is increasing so the eddy current is counterclockwise At the trailing edge of the magnet right the magnetic flux is decreasing so the eddy current is clockwise Due to Lenz's law the eddy currents create counter magnetic fields blue which oppose the magnetic field which created them At the leading edge of the magnet left the counterfield is directed up creating an opposing force between the surface of the disk and the magnet At the trailing edge right the counterfield is directed down creating an attractive force between the departing surface of the disk and the magnet Both these forces oppose the motion of the disk acting as a drag force slowing it down The kinetic energy of the disk's rotation is dissipated as heat by the eddy currents flowing through the resistance of the metal 2015-06-13 own Chetvorno other versions cc-zero Uploaded with UploadWizard Eddy current brakes Eddy currents | ||||
