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Wireless charging of moving electric vehicles overcomes major hurdle in new Stanford research
http://news.stanford.edu/2017/06/14/big-advance-wireless-charging-moving-electric-cars/[font face=Serif]June 14, 2017
[font size=5]Wireless charging of moving electric vehicles overcomes major hurdle in new Stanford research[/font]
[font size=4]Stanford scientists have developed a way to wirelessly deliver electricity to moving objects, technology that could one day charge electric vehicles and personal devices like medical implants and cell phones.[/font]
By Mark Golden and Mark Shwartz
[font size=3]If electric cars could recharge while driving down a highway, it would virtually eliminate concerns about their range and lower their cost, perhaps making electricity the standard fuel for vehicles.
Now Stanford University scientists have overcome a major hurdle to such a future by wirelessly transmitting electricity to a nearby moving object. Their results are published in the June 15 edition of Nature.
…
To address the challenge, the Stanford team eliminated the radio-frequency source in the transmitter and replaced it with a commercially available voltage amplifier and feedback resistor. This system automatically figures out the right frequency for different distances without the need for human interference.
“Adding the amplifier and resistor allows power to be very efficiently transferred across most of the three-foot range and despite the changing orientation of the receiving coil,” said graduate student Sid Assawaworrarit, the study’s lead author. “This eliminates the need for automatic and continuous tuning of any aspect of the circuits.”
…[/font][/font]
[font size=5]Wireless charging of moving electric vehicles overcomes major hurdle in new Stanford research[/font]
[font size=4]Stanford scientists have developed a way to wirelessly deliver electricity to moving objects, technology that could one day charge electric vehicles and personal devices like medical implants and cell phones.[/font]
By Mark Golden and Mark Shwartz
[font size=3]If electric cars could recharge while driving down a highway, it would virtually eliminate concerns about their range and lower their cost, perhaps making electricity the standard fuel for vehicles.
Now Stanford University scientists have overcome a major hurdle to such a future by wirelessly transmitting electricity to a nearby moving object. Their results are published in the June 15 edition of Nature.
…
To address the challenge, the Stanford team eliminated the radio-frequency source in the transmitter and replaced it with a commercially available voltage amplifier and feedback resistor. This system automatically figures out the right frequency for different distances without the need for human interference.
“Adding the amplifier and resistor allows power to be very efficiently transferred across most of the three-foot range and despite the changing orientation of the receiving coil,” said graduate student Sid Assawaworrarit, the study’s lead author. “This eliminates the need for automatic and continuous tuning of any aspect of the circuits.”
…[/font][/font]
8 replies
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https://www.democraticunderground.com/1127111026
A wireless electric roadway is one of those ideas that doesn't make any sense, especially in a society that has trouble maintaining ordinary transportation infrastructure like bridges and pavement surfaces.
How do you keep fancy electronics alive in an environment like this:
Notice the new-asphalt-over-bad patch at the bottom of the photo, a repair that probably didn't last the winter because the road bed underneath wasn't built to take the pounding it gets. Digging it all up and rebuilding it to survive modern traffic simply isn't in the budget.
KISS (Keep it Simple Stupid) is a very sound engineering principle.
Unlimited overland long distance electric transportation systems already exist, since the later 19th century. The St. Charles Streetcar Line in New Orleans was electrified in 1893. The Japanese Shinkansen "bullet trains" have been running since the 'sixties.
A wireless electric roadway is one of those ideas that doesn't make any sense, especially in a society that has trouble maintaining ordinary transportation infrastructure like bridges and pavement surfaces.
How do you keep fancy electronics alive in an environment like this:
Notice the new-asphalt-over-bad patch at the bottom of the photo, a repair that probably didn't last the winter because the road bed underneath wasn't built to take the pounding it gets. Digging it all up and rebuilding it to survive modern traffic simply isn't in the budget.
KISS (Keep it Simple Stupid) is a very sound engineering principle.
Unlimited overland long distance electric transportation systems already exist, since the later 19th century. The St. Charles Streetcar Line in New Orleans was electrified in 1893. The Japanese Shinkansen "bullet trains" have been running since the 'sixties.
