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Magnetic Levitation

Magnetic levitation, maglev, or magnetic suspension is a method by which an object is suspended with no support other than magnetic fields. Magnetic force is used to counteract the effects of the gravitational acceleration and any other accelerations. The two primary issues involved in magnetic levitation are lifting force: providing an upward force sufficient to counteract gravity, and stability: ensuring that the system does not spontaneously slide or flip into a configuration where the lift is neutralized. Magnetic levitation is used for maglev trains, contactless melting, magnetic bearings and for product display purposes.

Magnetic materials and systems are able to attract or press each other apart or together with a force dependent on the magnetic field and the area of the magnets, For example, the simplest example of lift would be a simple dipole magnet positioned in the magnetic field of another dipole magnet, oriented with like poles facing each other, so that the force between magnets repels the two magnets.

Essentially all types of magnets have been used to generate lift for magnetic levitation; permanent magnets, electromagnets, ferromagnetism, diamagnetism, superconducting magnets and magnetism due to induced currents in conductors.

For successful levitation and control of all 6 axes (degrees of freedom; 3 translational and 3 rotational) a combination of permanent magnets and electromagnets or diamagnets or superconductors as well as attractive and repulsive fields can be used. From Earnshaw's theorem at least one stable axis must be present for the system to levitate successfully, but the other axes can be stabilized using ferromagnetism. The primary ones used in maglev trains are servo-stabilized electromagnetic suspension (EMS), electrodynamic suspension (EDS).

Read the full history of magnetic levitation at Wikipedia by clicking here.



Magnetic Levitation in the News
Read the latest news articles about Magnetic Levitation on our News page.
Top News Items
Scientists Show Off Gravity-Defying Breakthrough In Magnetic Levitation Research
Researchers may have unlocked the potential for gravity-free technology. A new study published in Applied Physics Letters highlights how researchers have made huge breakthroughs in magnetic levitation ... continued..
China's T-Flight, how a maglev vacuum train traveling at 1,000 km/h could shrink the world
China's aerospace engineers are combining magnetic levitation and vacuum tube technology to build a train that travels nearly as fast as sound, making cross-country trips shorter than a lunch break. continued..
Magnetic Levitating Shoe Display Stand – LED Lights, App Controlled, Holds Shoes Up To 550g
Using magnetic levitation, it makes your shoes float in mid-air – seriously cool for collectors, stores, or exhibitions. It holds shoes weighing up to 550g and fits inner heights up to 13.7 inches ... continued..
Graphite platform levitates without power
Magnetic levitation is used to float everything from lightbulbs to trains, with varying levels of success, but usually it requires a power source. Now, scientists in Japan have developed a way to make ... continued..
Latest Mag Lev Videos
Check out all the latest Youtube videos about magnetic levitation on our Videos page.
Large gap magnetic levitation project
I think this is the largest gap maglev seen on YouTube. Currently 130 mm height from surface (hello Crealev), still working on it to improve stability and achieve 200 mm and more. continued..
Do it Yourself Magnetic Levitation! - Part 1 of 4
This is a frictionless bearing made out of common items and low cost magnets. I found the magnets from Radio Shack. continued..
RTFMs Episode #8: How to Build a Magnetic Levitating Top
Once you have completed this project you won't believe your eyes that it is actually working. A top can not only spin, but also hang in the air for a few minutes balancing a few inches above surface. This DIY project explains how to implement and tune a spin-stabilized magnetic levitation. You will find out how to make continued..
Quantum Levitation
Suspending a superconducting disc above or below a set of permanent magnets. The magnetic field is locked inside the superconductor ; a phenomenon called 'Quantum Trapping'. continued..
Magnetic levitation - Strong magnets levitating a man
Can two awesome neodymium magnets levitate a grown man? Watch this video to see if the huge magnets featured in our previous video (Super-strong neodymium magnets crushing a man's hand - http://youtu.be/0t8yDnyOaQ8) can levitate a grown man when they are used to repel each other. continued..
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