Maglev Trains And The Technology Behind Them

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Maglev Trains And The Technology Behind Them Introduction Magnets Magnetism is a phenomenon that occurs when a moving charge exerts a force on other moving charges. The magnetic force caused by these moving charges sets up a field which in turn exerts a force on other moving charges. This magnetic field is found to be perpendicular to the velocity of the current. The force of the field decays with distance from the charge. Most magnets we come across are weak permanent magnets, such as fridge magnets and door catches. A permanent magnet is a material that is naturally magnetic, they set up magnetic fields by electrons circling an atom setting up magnetic fields. They are based on oxides of barium and iron. They have low field strength and would not be strong enough for use in Maglev trains. Lately, developments in magnet research have found rare earth-permanent magnets that have a much stronger magnetic field. These new magnets have become an important part of our everyday life being used in many everyday applications such as computers, CD players and mobile phones. It is these high performance magnets that are used in Maglev trains. The rare earth elements are scandium 21, yttrium 39 and lanthanide's 57-71. ---------------------------------------------------------------------- The principle of a Maglev (Magnetic Levitation) train is that it floats on a magnetic field and is propelled by a linear induction motor. They follow guidance tracks with magnets and have been seen to have great potential in the transport world. [IMAGE]An example of a maglev train from http://www.newscientist.com Simple Theory ... ... middle of paper ... ...rails.org/tMspages/TPMagIntro.html Useful site giving me the clear definitions between EDS and EMS as well as pictures http://www.transrapid.de/ Used for info and history on German and Chinese projects. Advancing Physics A2 book. Used for equations for magnets and information on electromagnets www.trymegaessays.com --------------------- Used for information of superconductor problems detailed magnet theory and maglev information. Not written well too confusing. Physics World magazine Used for initial info Maglev Encyclopaedia Britannica 11 Used for small amount of advanced info on magnets. Repulsion picture http://math.ucr.edu/home/baez/physics/General/Levitation/levitation.html Earnshaw theorem info The Complete A-Z of Physics handbook Equations and magnet theory

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