Eddy Current Brakes Ppt Slides

April 3, 2018 | Author: CHarii MAttela | Category: Magnetic Field, Inductor, Electric Current, Brake, Magnetism


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 Introduction of eddy current.  Introduction of eddy current brake.  Types of eddy current brake.  Circular eddy current brake.  Linear eddy current brake.  Working principle.  Advantages and Disadvantages.  Application and future aspects.  conclusion Pediain.com com .  These circulating eddies of current have inductance and thus induce magnetic flux.  Pediain.  Voltage produces circulating currents in the core. These currents are known as eddy currents. voltages are induced in all possible paths enclosing the flux.When a magnetic core ( or conductor ) is subjected to a time varying magnetic field . com . It slows an object by creating eddy currents .  Braking force depends on speed of object. Pediain.  A braking force is possible when electric current is passed through the electromagnets.  Braking action is made by varying the strength of the magnetic field.  Circular eddy current brakes  Linear eddy current brakes Pediain.com .  Disc is placed between poles .  Consist of a disc (rotor) made up of magnetic material. Pediain.com . Brake assembly is circular in shape.  Conductor coils are wound on poles to create magnetic field.  The movement of the disc through the magnetic field of the electromagnets creates eddy currents in the discs. com .Pediain.  The principle of the linear eddy current brake has been described by the French physicist Foucault.  The linear eddy current brake consists of a magnetic yoke with electrical coils positioned along the rail. Pediain.  This magnet does not touch the rail. but is held at a constant small distance from the rail (approximately 7 mm).com . Pediain.com . which are  Faraday’s law e = .“An induced electromotive force (emf) always gives rise to a current whose magnetic field opposes the original change in magnetic flux” Pediain. Eddy current brake is based on two basic laws of electromagnetics .d/dt  Lenz law :.com . com .Magnetic field lines across the magnetic material inside a copper tube Pediain. Pediain.com .  Opposing magnetic fields create force that reduces velocity.  EMF produces eddy currents in disc. Electromagnets produce magnetic field from supplied current .com .  Due to change in magnetic flux linkage(with time) EMF is induced in conductor (disc).  Eddy Currents produce another magnetic field opposing the first field. Pediain. Pediain.com . com .Pediain. (Arrangement of ECB in high speed trains) Pediain.com . V =0 V>0 Pole core coil N F Rail S S N F F A F B N A Flux lines Pediain.com .  Copper and aluminum is used as winding materials. The braking energy of the vehicle is converted in eddy current losses which lead to a warming of the rail.  Braking force is low at low speeds and high at high speeds. Pediain.  permanent magnets can be used instead of electromagnets .com . thus not requiring any power supply.  Can be activated at will via electrical signal.  It uses electromagnetic force instead of friction.  No noise or smell. Pediain.  Light weight.No contact. therefore no wear or tear.com .  High brake forces at high speeds.  Adjustable brake force.  Low maintenance.  no ability to hold the load in position at standstill.com . ECB is used with ordinary mechanical brakes. Pediain.Braking force diminishes as speed diminishes.  very tough design and simulation. com . In high speed trains.  It is also used in vehicles but still not widely used. Pediain.  In roller coaster for braking and smooth functioning.  By the use of ECB in future we can control high speed train completely. Pediain. In future ordinary brakes will be replaced by the ECB completely.com .  By some new invention of extra mechanism we can use ECB for slow speed vehicles also.  It makes use of opposing tendency of eddy current. ECB is a good invention for the speed control of high speed vehicles  We can control the speed of high speed vehicles without wear and tear . Pediain.com .  Drawback of ordinary mechanical braking system can be overcome by application of ECB. wikipedia.google.wikipedia.in  www.com/eddy-current- brakes  www.explainthatstuff.org/wiki/Eddy_current_ brake/  www.co. www.org/wiki/Eddy_current Pediain.com . Pediain.com . com .Pediain.
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