Release date: 2012-12-20
Researchers at the University of British Columbia (UBC) in Canada have developed a technology for wireless charging of electric vehicles using "remote magnetic transfer devices" and successfully tested them on campus service vehicles. The technology is expected to accelerate the adoption of electric vehicles in Canada.
Wireless charging is a hot technical solution for everything from mobile phones to electric vehicles, but people have been concerned about the high-power, high-frequency electromagnetic fields used in wireless charging and their potential impact on human health. UBC physics professor Ron Whitehead and his team invented a completely different approach that runs 100 times less frequently than general-purpose technology and has an exposed electric field that is negligible. Their solution uses a "remote magnetic transfer device" - a rotating base magnetic base driven by the grid power (the second is placed inside the car) to eliminate the use of radio waves. The base magnetic seat provided at the charging station can remotely start the rotation of the magnetic seat in the vehicle, thereby generating electric power to charge the battery.
The researchers installed four wireless charging stations on the University of British Columbia campus and adapted the tested campus service vehicles with new technology. Tests have shown that the system is 90% more efficient than cable charging. It takes 4 hours for the vehicle to fully charge at one time, and a fully charged vehicle can run for 8 hours.
David Woodson, the university's general manager of infrastructure operations, said one of the main challenges for electric vehicles is the need to connect power lines and outlets, often in inclement weather and crowded conditions. After the system started testing, the driver's feedback has been very positive. All they need to do is stop the car and the car will automatically start charging.
The team's initial vision was to design a magnetically driven charging system for small medical devices such as implantable pacemakers. The current larger system, supported by the National Research Council Innovation Fund of Canada, tests the campus as a living laboratory and is expected to provide valuable data for further research and development. Currently, the research team has filed a patent application through the University's Industrial Liaison Office.
Source: Kexun
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