Electrodynamic Suspension (EDS) is primarily used in the Japanese SC System. It relies on the principal of superconductivity, where superconductive magnets, are cooled to extreme temperatures. The superconducting magnets are placed on the side of the carriage, and interact with figure eight shaped coils on the side of the guideway. The coils experience the change in magnetic field, caused from the superconductor's motion, as the train moves. Two currents are generated that oppose the change in magnetic field. One below that creates a reactive magnetic field that opposes the superconductive magnet, and one above that creates a pull that attracts it. Thus, the two forces work together to achieve a hover of a 100mm above the guideway. Propulsion is obtained by a Linear Synchronous Motor, which consists of additional coils in the guideway that create a current. The magnetic field created by the superconductor then interacts with this magnetic field created by the motor to propel the train forward.
Pros and Cons
There are many advantages of Maglev trains, which all originate from the fact that they lose no energy to friction, unlike normal trains. As a result, they have longer lifetimes, lower operating costs, and are able to travel faster and quieter. Comparing both systems, EMS has a lower magnetic exposure to passengers, meanwhile EDS is safer during power outages. The disadvantages of Maglev trains vary based of the type of system. EMS trains require more expansive computer systems to monitor magnetic separation; while EDS trains have costs associated with cooling the necessary superconductive magnets.
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