Japan R & D charge highway electric car farewell to bulky battery
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Japanese scientists develop charging highways. If their dreams come true, future electric vehicles will be charged by charging roads. With the introduction of this technology, electric cars will say "goodbye" with bulky batteries. The battery not only increases the weight of the car, increases the fuel consumption, but also requires frequent charging.
Several decades ago, some people proposed the idea of ​​building a charging road. Previous attempts to implant the charging coil into the road to form an electromagnetic field that reacts with a coil to charge the car. Masahiro Hanazawa of the Toyota R&D laboratory at Nagato, Aichi Prefecture, Japan, said: “Because the coils must be face-to-face for higher energy efficiency, this technology can be used to recharge cars in parking lots, but it will never be possible. Efficient charging for a moving car."
Currently, Masayuki Kazawa and Takashi Murira of Toyohashi University of Technology in Aichi Prefecture are developing a system that can transmit power through strips between tires and metal plates on highways. Kazawa Masaki said: "The way we use it is to use a pair of tires to transmit electricity. The tires are always in contact with the road."
In order to test the extent of the loss of electricity when passing through the tire rubber, Kazawa Masaki and Daping Murakami conducted a laboratory experiment. In the experiment, they placed metal plates on the floor and in the tires. Taiping Murakami said: "The energy loss in the circuit is less than 20%." At the Microwave Power International Symposium held in Kyoto in May, the research team announced their findings. Daping Murakami said that with sufficient power, this system can power a typical passenger car. Currently, the research team is developing a small-scale prototype to verify the effectiveness of this charging system. He admitted that the energy loss of this technology is much higher than that of ordinary batteries.
John Boyce, an electrical engineer at the University of Auckland in New Zealand, pointed out that if this system is used, the voltage of the highway metal plate needs to reach 50,000 volts in order to meet the charging needs of the car. This voltage is the same as the voltage required by the tasers. He said: "You are absolutely unwilling to drive on such a highway." In addition, the circuit board will generate a powerful magnetic field that will cause severe radio frequency interference and may cause all electrical systems to become chaos when the required energy level is met. Among them.
Daniel Friedman of the University of New South Wales in Sydney, Australia, said: “The cost of retrofitting existing roads and installing the necessary infrastructure is extremely expensive.†The only feasible way is to use metal plates on the main highways, and other roads. The car still uses the battery. British "New Scientist"
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