Published on August 14th, 2013 | by Cynthia Shahan8
Active Wireless Charging In Transit; Remarkable Progress In Korea For Electric Vehicles
Improvements with the electric transit infrastructure unfold at light speed. Active wireless charging in transit with electric vehicles, in this case electric buses, is taking place. Korea has broken through with accelerated wireless power efficiency with the Online Electric Vehicle (OLEV). This technology from the Advanced Institute of Science and Technology (KAIST) is setting another standard that increases the development of electric vehicles and addresses the (slight) time issue of charging. This breakthrough works for personal or public transportation presently, allowing vehicles to be charged while stationary or while moving.
“This is accomplished by solving technological issues that limit the commercialization of electric vehicles such as price, weight, volume, driving distance, and lack of charging infrastructure,” ResearchSEA writes.
Following the development and operation of commercialized OLEV trams (at an amusement park in Seoul) and shuttle buses (at KAIST campus), respectively, the City of Gumi in South Korea, beginning on August 6th, is providing its citizens with OLEV public transportation services.
Two OLEV buses will run an inner city route between Gumi Train Station and In-dong district, for a total of 24 km roundtrip. The bus will receive 20 kHz and 100 kW (136 horsepower) electricity at an 85% maximum power transmission efficiency rate while maintaining a 17cm air gap between the underbody of the vehicle and the road surface.
This is inspiring progress even to the ones who have unearthed the possibility. As Dong-Ho Cho, a professor of electrical engineering and the director of the Center for Wireless Power Transfer Technology Business Development at KAIST, said: “It’s quite remarkable that we succeeded with the OLEV project so that buses are offering public transportation services to passengers. This is certainly a turning point for OLEV to become more commercialized and widely accepted for mass transportation in our daily living.”
Will we be seeing more of these adaptable accelerated modes of transportation? We will in Korea, at least:
OLEV receives power wirelessly through the application of the “Shaped Magnetic Field in Resonance (SMFIR)” technology. SMFIR is a new technology introduced by KAIST that enables electric vehicles to transfer electricity wirelessly from the road surface while moving. Power comes from the electrical cables buried under the surface of the road, creating magnetic fields. There is a receiving device installed on the underbody of the OLEV that converts these fields into electricity. The length of power strips installed under the road is generally 5%-15% of the entire road, requiring only a few sections of the road to be rebuilt with the embedded cables.
OLEV has a small battery (one-third of the size of the battery equipped with a regular electric car). The vehicle complies with the international electromagnetic fields (EMF) standards of 62.5 mG, within the margin of safety level necessary for human health. The road has a smart function as well, to distinguish OLEV buses from regular cars — the segment technology is employed to control the power supply by switching on the power strip when OLEV buses pass along, but switching it off for other vehicles, thereby preventing EMF exposure and standby power consumption. As of today, the SMFIR technology supplies 60 kHz and 180 kW of power remotely to transport vehicles at a stable, constant rate.
The first two OLEV buses are operational this year. At the end of the year, Gumi City plans to start rolling out more, aiming to have ten on the ground and running by 2015.