The first principle is that when the magnetic field near the metal changes, the electrons on the metal will move and generate current.
The second principle is the magnetic effect of current. When current flows in a wire or a piece of metal, a magnetic field is generated. The electrified coil becomes a magnet.
The third principle is that magnets will interact, repel each other with the same polarity and attract each other with different polarity.
Maglev train is mainly composed of suspension system, propulsion system and guidance system. Although the propulsion system independent of magnetic force can be used, in most of the current designs, the functions of these three parts are completed by magnetic force.
Extended data:
Maglev train is a modern high-tech rail transit vehicle, which realizes non-contact suspension and guidance between the train and the track through electromagnetic force, and then draws the train by electromagnetic force generated by linear motor.
1922, German engineer Herman Qiang put forward the principle of electromagnetic levitation, and then applied for a patent. Since 1970s, with the strengthening of the economic strength of industrialized countries, Germany, Japan, the United States and other countries have successively carried out research and development of magnetic levitation transportation systems to improve their transportation capacity and meet the needs of their own economic development and people's lives.
References:
Baidu encyclopedia-maglev train