• Charge Your Phone (and Your Car) from Afar
    46 replies, posted
[QUOTE=SIRIUS;34654522]no, basically making wires obsolete [/QUOTE] That's as dumb as saying a cable modem is obsolete. Unless electricity can be sent by wireless in a direct straight line, it is wasted.
[QUOTE=Zeke129;34652384]Major highways could be made entirely out of whatever this is[/QUOTE] We could cover all of earth with whatever this is [editline]11th February 2012[/editline] Everything would always be charged!
Its totally not like transmitting that much power won't interfere with cellular, wifi, and and other signals of a neighborhood.
[QUOTE=AK'z;34654642]That's as dumb as saying a cable modem is obsolete. Unless electricity can be sent by wireless in a direct straight line, it is wasted.[/QUOTE] then it sounds like the problem is power generation
[QUOTE=SIRIUS;34654797]then it sounds like the problem is power generation[/QUOTE] we're working at it. :)
[QUOTE=AK'z;34654815]we're working at it. :)[/QUOTE] [url]http://articles.businessinsider.com/2010-10-12/markets/29998566_1_offshore-wind-land-based-wind-wind-power[/url] this, individual solar power, and we're laughing
[QUOTE=SIRIUS;34655164][url]http://articles.businessinsider.com/2010-10-12/markets/29998566_1_offshore-wind-land-based-wind-wind-power[/url] this, individual solar power, and we're laughing[/QUOTE] yeah, I've seen the kite experiment. It's a neat idea, but can never be put into practice.
[QUOTE=mac338;34654649]We could cover all of earth with whatever this is [editline]11th February 2012[/editline] Everything would always be charged![/QUOTE] If that were possible, then naturally portable devices would become more powerful much faster because battery life would no longer be a factor in processor choice and screens and such. Nifty Indeed.
Imagine those inside walls. You walk into a room and suddenly your phone is charging. You take our your laptop and can play forever without charging your battery. Because it charges itself. You go to your room, take your monitor and put it on a wall. Who the hell needs cables anyways?
[QUOTE=AK'z;34655222]yeah, I've seen the kite experiment. It's a neat idea, but can never be put into practice.[/QUOTE] "kite" experiment?
[QUOTE=SIRIUS;34656003]"kite" experiment?[/QUOTE] [media]http://www.youtube.com/watch?v=rWvKvFlZIgQ[/media]
[QUOTE=AK'z;34654329]Basically wasting electricity.[/QUOTE] This is just the start, I'm sure they can find a way to make it more efficient. Bashing it now and saying wires are good enough is like saying the first automobiles were a waste of time and money and will never go anywhere because we already have horses.
saw this on TED three something years ago
I fucking love Induction and it's millions of uses. Edit: Of course, how efficient is it to "transmit" a good enough voltage and current to charge a car over at least a distance of two feet? The SkyTrain uses Linear Induction and 600V DC is required to move the train while the coil and reaction plate must be no further than 15mm from eachother.
[QUOTE=dude2193;34647260]Tesla was right[/QUOTE] Tesla was always right, that man gets nowhere near as much credit as he should
The highway charger is the best use of this by far. Batteries in general are a terribly inefficient method of storage with hydrogen being just a bit behind petroleum. The highway charger lets you have a hydrogen powered car with the ability to drive on highways using cheap as fuck electricity, without needing to refuel. I wouldn't electrify every road though, too expensive and you need the redundancy of a hydrogen fuel source in case something fucks up. Just major ones, keep it government run too.
[QUOTE=squids_eye;34656162]This is just the start, I'm sure they can find a way to make it more efficient. Bashing it now and saying wires are good enough is like saying the first automobiles were a waste of time and money and will never go anywhere because we already have horses.[/QUOTE] No, it really isn't anything nearly that stupid, but it's fun to say that when the terms "magnetic permeability" and "hysteresis loss" are meaningless to you. Cars had an immediate performance and convenience benefit over horses. This will, indisputably, have a performance loss over a direct connection. They admit themselves they're not ever getting past 80% efficiency, and it's at 50% currently. [URL="http://www.sciencemag.org/content/317/5834/83.short"]Five years ago it was 40%.[/URL] Skepticism here is legitimate. Sure, in the future [URL="http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4025480"]everything might be this way[/URL], but once upon a time people thought it was perfectly reasonable to assume all houses in the future would be made out of plastic, and here we are, still sitting in wooden boxes. [QUOTE=QwertySecond;34651159]I don't think so. From what I remember seeing this a while back, the transmitter and receiver coil both oscillate at about 64.5GHz (can't remember the actual value), and the magnetic field tunnels straight between both coils, ignoring anything not oscillating at the same frequency. Which is the same reason that plugging these into the mains will not send high voltage shooting into any metal surface or nearby people.[/QUOTE] It's not really that simple (not all implementations of wireless power utilize the evanescent midrange stuff you're talking about with the "tunneling", and those that do are omnidirectional low-power only, the high power stuff you'd hook up to a main isn't and involves secondary coils), and it's more an affair of theory at present than proof. To quote the guys working on it of import (specifically, Soljacic): [QUOTE=http://www2.lns.mit.edu/fisherp/83.pdf]A detailed and quantitative analysis of the effect of external objects on our scheme is beyond the scope of this work, but we note here that the power transfer is not visibly affected as humans and various everyday objects, such as metals, wood, and electronic devices large and small, are placed between the two coils—even in cases where they completely obstruct the line of sight between source and device (figs. S3 to S5). External objects have a noticeable effect only when they are within a few centimeters from either one of the coils. Some materials (such as aluminum foil, Styrofoam, and humans) mostly just shift the resonant frequency, which can in principle be easily corrected with a feedback circuit; other materials (cardboard, wood, and polyvinyl chloride) lower Q when placed closer than a few centimeters from the coil, thereby lowering the efficiency of the transfer.[/QUOTE] That's all well and good, but until he has an empirically verified model of how this system interacts with external objects, I'm not trusting it as far as I can throw it. As far as wireless shit you'd be hooking up to a main...that's probably still shielded or isolated, and if you know of anywhere where it isn't, I'd call an electrical inspector, because: [QUOTE=https://researchspace.auckland.ac.nz/bitstream/handle/2292/243/243.pdf?sequence=1]Both the primary and secondary resonant circuits of the ICPT systems are normally designed to operate at the nominal resonant frequency, but care must be taken in such designs since system performance could deviate from design expectations if the loading becomes significant. Generally, such deviations are small if the mutual inductance is much lower than the leakage inductance, [B]but become more significant if the mutual inductance is comparable to the leakage inductance as is the case in many practical applications.[/B][/QUOTE] But methinks you pulled that from wikipedia, which is forgivable, because the wiki pages on this shit right now are about as wrong as you can get. So yeah, I don't know about you guys, but I'd rather not worry about whether or not somebody parked the car wrong for a year and now I've got leakage flux in my garage when I could just slap some copper on it and call 'er good.
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