scientific popularization

The maglev train that levitates the vehicle by the attraction of magnets adopts T-shaped guide rails, and the lower parts on both sides of the vehicle surround the two sides of the guide rails. An electromagnet with strong magnetic force is installed at the inner turning part of the lower part of the vehicle, and a steel plate is installed at the bottom of the guide rail. The steel plate is above and the electromagnet is below. The so-called electromagnet is a metal coil. When current flows through the coil, magnetic force can be generated to attract the steel plate, and the vehicle is lifted upward. When the gravity is balanced with the gravity of the vehicle, the vehicle can be suspended at a certain height above the guide rail. Changing the current will also change the strength of the magnetic field, so that the height of suspension can be adjusted. Another maglev train levitates the vehicle by repulsive magnetic force. Its orbit is u-shaped. When the train moves forward, the electromagnet under the train induces a current in the coil buried in the track, so that the coil in the track also becomes an electromagnet, which generates repulsive magnetic force with the magnet under the train and pushes the vehicle off the track upwards.

A train suspended by repulsive magnetic force can accelerate to 50 km/h as soon as it starts, and then suspend on the track after running 100 meters. The faster the train flies along the ground, the highest speed can reach 350 km/h at present (theoretically, it can reach a higher speed).