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.