Shanghai maglev train principle is electromagnetic or permanent magnet?

- Jul 18, 2019-

Shanghai has the only commercial maglev train in the country, located between longyang road on Shanghai metro line 2 and Shanghai pudong international airport, which has been in operation for 17 years since 2002. Since the maglev train reaches its maximum speed in 39 seconds after starting up, its maximum speed is 552 kilometers per hour. Electric drive, no harmful gas emissions and other advantages. Many tourists from other parts of the country come to try out Shanghai's maglev train, which has become a popular tourist attraction.


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Magnetic levitation (maglev) train is a kind of high-tech vehicle which utilizes magnetic attraction and repulsion between poles. Simply put, repulsion makes the train hang and attraction makes it move. ?


There are electromagnets on the trains and coils at the bottom of the tracks. After electrification, the polarity of magnetic field generated by the coil on the ground is always the same as that of the electromagnet on the train. Both are "like and repel", and the repulsive force makes the train suspend. Coils are also installed on both sides of the track, and alternating current makes the coil become electromagnet. It interacts with electromagnets on the train to keep it moving.



Magnetic levitation (maglev) train is a kind of modern high-tech rail transportation tool, which reflects the typical mechatronics high-tech development status of electromagnetism, electronic technology, control engineering, signal processing, mechanics and dynamics. The research field of maglev in the world is very active. High-speed maglev trains are usually divided into two categories. One is the normal maglev, which USES the principle of ordinary direct current electromagnet to suspend the train. The other type is superconducting magnetic levitation train, which USES the strong magnetic field generated by superconducting magnets. The train interacts with coils arranged on the ground during operation, generating electric repulsion force to levitate the train, and the speed can reach more than 500 kilometers.


Two kinds of magnetic levitation are electromagnetic drive have no permanent magnet?


Although the permanent magnet due to high cost, poor temperature performance, difficult to drive and other shortcomings, but the permanent magnet type of maglev train is some. 2006 "zhonghua 01" permanent magnet suspension road vehicle model was presented at 2006 China international patent technology and product fair in dalian. This model is a simulation miniaturization of dalian 3000m permanent magnet suspension test line, which is specially designed for regional traffic between cities. In May 2018, the national university of defense technology successfully tested a new magnetic levitation engineering prototype vehicle, which can reach a speed of more than 160 kilometers per hour. For the first time in the world, this train adopts the technical scheme of "long stator permanent magnet linear synchronous traction + permanent magnet electromagnetic hybrid suspension", which has the characteristics of low energy consumption, high traction efficiency and convenient equipment replacement and maintenance. Through the optimization and upgrading of the traction and suspension system, a series of key technological breakthroughs have been achieved in modularization, lightweight, integration and other aspects. Compared with the medium-low speed maglev traffic put into operation in China, the suspension power consumption has been reduced by 20%, the traction efficiency has been improved by more than 10%, and the comprehensive technical performance has reached the international advanced level.


China's permanent magnet suspension, Japan's superconducting suspension and Germany's normal suspension are the world's three major suspension systems.