In the east of China was prototype tested magnetic levitation trains with unique wireless power. Such vehicles, including monorails, have long used electromagnetic induction to generate power. However, Chinese scientists were able to surprise. Instead of the usual efficiency of 20-50% for this method of energy transfer, Chinese technology provides an unprecedented efficiency of 92.4%. There is nothing like it anywhere in the world.
Image Source: CRRC Zhuzhou Locomotive
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, regarding 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 transmission of energy on board the train without wires, engineers were looking for a way to eliminate mutual interference between the supply field and the electromagnetic field driving the train (this was done by different coils); 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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