Speed Passion Wireless Power

[Northy]

Originally Posted by Swiss

By the way, I am no expert on this, but the US Regalations, (so very much worldwide) state the maximum amount of leakage from the Oven at distances of 5cm = 1.0mWcm, (squared) and 5.0mWcm, (squared) throughout it's operating life.

That is exactly why this will never work, the power is too low.

Forget about it. I think it's marketing bullshit to get people talking - oh look, it's worked!

G

[glypo]

G - I don't think Paul was trying to prove that wireless RC power is not possible with that statement.

Microwaves have strong ionising radiation which excites water to generate heat. So if microwaves from your oven escape it will literally cook you from the inside out... nasty! With wireless power for RC I doubt very much the frequencies would be anywhere near that of a microwave over (although they may be on the microwave spectrum).

[Northy]

OK, but think of the POWER we use.....
A motor can take 100A + at start up, and an AVERAGE of 20A over 5 mins.

I too have read the articles about this (I work in the electronics industry), there is no way you could wirelessly transmit that sort of power at the moment (which does not mean with 6 months development it will be BRCA legal in 2009 - I'm talking 10's of years!).

G

[Nick Goodall]

They had a completely Wireless TV at the recent(ish) Technology show in Vegas..... and i've heard about them working wireless powered Laptops for about a year now - Could be interesting and i think there's no doubt it WILL work in the future, but not sure how far off it is yet......

If it's 10 years time just think how good the Lipo's would be by then anyway - 30min races are almost possible now!!

[Swiss]

Originally Posted by Northy

OK, but think of the POWER we use.....
A motor can take 100A + at start up, and an AVERAGE of 20A over 5 mins.

I too have read the articles about this (I work in the electronics industry), there is no way you could wirelessly transmit that sort of power at the moment (which does not mean with 6 months development it will be BRCA legal in 2009 - I'm talking 10's of years!).

G

I must admit to find a MMIC, (IC) that could handle this sort of power would be tough. I personally don't know of any FAB's worlwide that are currently producing this sort of technology, (I could be wrong). Although, I guess becuase the data rate would be low, you could operate the Amp in its saturated power band, e.g. it wouldn't have to operate in the linear band, (conversation e.g. Bluetooth headsets have high data rate, and consequently have to work in the linear range to minimise distortion)

Regarding exposure, there are so many differant aspects to consider when talking exposure levels. e.g. time exposed etc.. Even ICNIRP have differant std's for RF Workers, General Public etc.. So I think we should leave it to the experts... and wait and see. Who nows in a couple of years this could be the technology. I am sure if we could all guess what is round the corner we would all be very rich

P

[glypo]

G you mention power then talk about current. 100A means nothing, as lets face it sub-c cells can't even supply that. Wireless power will still rely on capacitors and low capacity high draw systems for the bursts we need just like current cells. So it's only the 20A we need to worry about. So lets consider power, that's 144 watts. That's not an awful lot at all really.

I agree with Nick, this is already being done. Fair enough at a shorter range, but at a much higher power. Who knows when this will come to rc, 10's of years seems a little too far off though! But yes, just because this is viable (well I suppose lets wait and see what they actually come up with before mentioning viable) I don't think it will be wide spread in RC in the near future. As said, LiPo's are too good even now. That's going to be the future for RC for a long time yet.

[Swiss]

Originally Posted by glypo

G - I don't think Paul was trying to prove that wireless RC power is not possible with that statement.

Microwaves have strong ionising radiation which excites water to generate heat. So if microwaves from your oven escape it will literally cook you from the inside out... nasty! With wireless power for RC I doubt very much the frequencies would be anywhere near that of a microwave over (although they may be on the microwave spectrum).

Just one thing Glypo, as Microwaves are Non Ironizing radiation, they don't actually 'excite' the water molecules. Ironizing radiation doesn't start until 2420million MHZ, and at this frequency the photon energy levels are approximately the same 12.4eV, (at 2.45GHz energy levels approx 0.01eV) as the energy binding electrons to atoms. And at this energy water molecules can be ionized.

Roughly the way a microwave works is at 2.45GHz the wavelength which is a couple of cm, will absorb into the product and release energy, (heat)..

P

[glypo]

Non-ionising, oops.

Sorry for going off topic, but if microwave ovens aren't ionising and it's not to do with excitation... how do microwaves generate heat. A particle can't just absorb heat from electromagetic radiation. Is it simply to do with water being a dipolar particle, so as these move to orient them self in a planar, or polar, direction the movement generates heat?

That's the only possible explanation I can think of. I just assumed it was ionising, thanks for correcting me. I might have to do some google and wikipedia'ing later

Either way, my overall point stays true that microwaves are only dangerous as they heat water and perhaps other dipole molecules so can effectively cook a person anyway. And that rc power in theory at least is possible and could be done safely.

[MRD]

BAM! wireless power technology



Just give me the prize for sience now

[DCM]

hey, it is a stock touring car race!!! or thats how they drive like