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Wireless powered maglev train

31.03.2022

A prototype maglev train powered by a unique wireless power supply has been tested in eastern China.

Such vehicles, including monorails, have long used electromagnetic induction to generate energy. However, Chinese scientists were able to surprise. Instead of the usual efficiency of 20-50% for such a method of energy transfer, Chinese technology provides an unprecedented efficiency of 92,4%. There is nothing like it anywhere in the world.

Traditional maglev (maglev trains) use so-called linear motors. In this scheme, the monorail and train equipment are actually one electric motor. One moves relative to the other and this leads to the generation of electric current on board the maglev. The efficiency of such an engine can be at the level of 20% or a little more. In addition, such a system does not generate energy during a stop, which requires other sources to power the onboard equipment. The new Chinese technology is devoid of this shortcoming.

In fact, Chinese engineers from CRRC Qingdao Sifang have developed a wireless power supply system for maglevs similar to the operation of an induction cooker. Along the canvas were placed electromagnetic coils, each of a special shape, about 20 meters long. Also, the receiving antenna on board the train was modified in a special way. In tests, the system at all speeds up to 600 km / h showed the ability to constantly transmit more than 170 kW of power to the maglev. It worked equally effectively both in motion and at stops.

Solving the problem of efficient energy transfer on board the train without wires, the engineers were looking for a way to eliminate the mutual interference of the supply field and the electromagnetic field driving the train (different coils did this); determined the optimal modes of turning on and off the power supply coils (at maximum speed, the train rushes over them in an instant) and solved a lot of other technological problems. Tests of the prototype showed that, in general, the problem was solved. The next generation of Chinese maglevs will become more advanced.

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