Maglev Essay

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Magnetic Levitation Maglev, short for magnetic levitation, is a new system being used in the design of train railways. These maglev trains are using electromagnetically-driven systems to achieve high –speed transportation. These trains move through electromagnetic propulsion, levitating over a guideway. The Electromagnetic Suspension (EMS) system has a large electrical power source, which is need to power the coils through the track’s guideways. Once powered, these guideways become magnetized, which repels the magnets built into the bottom of the train above it. The polarity of the magnetized coils is changed by constantly alternating the electric current supplied to the coils, which causes the magnetic field in front of the train to pull it forward. A maglev system is nonlinear and its open-loop response is unstable because of the nature of the magnetic forces used. PI controllers are based on a linearized model, so they do not compensate for certain variations. These variations can occur when a magnetic bearing experiences a working load change on the rotor during operation, ...

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