The Research for electric vehicle’s charge

Published:2011/9/14 22:31:00 Author:Li xiao na From:SeekIC

As we all know the electric vehicle is the developing tendency in the automotive industry. To solve the charging problem is the most important issue of the cars. Many scientists maintain that the future cars could be powered by electrified roadways. This technology enables cars to forgo their heavy batteries, which not only add to a vehicle’s weight, increasing the energy needed to move it, but also force it to sit idle while recharging.

This ideal has been come up for many years. An electrified coil had been used in the road to create an electromagnetic field that interacts with a coil attached to the car. Because the coils must be exactly aligned face-to-face to gain high energy efficiency, such schemes may be suited for vehicles in a parking lot, but never very ideal for cars while running.

A system, which can transmit electric power through steel belts placed inside two tyres and a metal plate in the road, is developed by Hanazawa and Takashi Ohira at Toyohashi University of Technology. This technology makes use of a pair of tyres, which are always touching a road surface. The energy will be lost when the electricity is travelling through the tyres’ rubber. In order to get the exact value, they had a lab experiment in which they put metal plates on the floor and inside a tyre. As a result, less than 20 per cent of the transmitted power is dissipated in the circuit. They admit that the energy loss is higher than the ordinary batteries.

This system also has so many disadvantages. John Boys, an electrical engineer at the University of Auckland, New Zealand, points out that with this system, the metal pads on the road would need as much as 50,000 volts to power the car, the same voltage used to operate tasers. Furthermore, the large magnetic field produced by the electric plates will cause radio -frequency interference that might create chaos with all manner of electrical systems. To rip up the roads and install the necessary infrastructure will be very expensive; therefore, one way around that may be to limit metal plates to main highways, and then run cars on other roads using small batteries.

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