I've seen a few videos on wireless power transmission and instead of making coils I'd like to use any of many old electronics I have laying around.
I know I could make some from small gauge wire but I understand the thick rigid conductors are better.
What would have a nice thick coiled inductor conductor in it?
You might be able to get the windings off of the toroid in a computer power supply.
Ok, i have some of those. Thanks
Just buy a reel of enamelled copper wire of the appropriate thickness (aka. magnet wire). Plenty of sources on line.
Russell.
Or just get some thick mains cable and wind your coil from one of the cores (leave the insulation on if you wish) but considering you may have no experience of wireless design and transmission it might well be better if you buy the correct components in the first place.
Thick rigid conductors are better because?
Normally litz wire would be used, and that's the very opposite of thick rigid conductors,
using lots of thin conductors braided so as to prevent the skin-effect from reducing the
effective conductivity of the coil.
Normally for ease of winding there is a maximum wire thickness it is practical to work with
(certainly for machine-wound coils), so several strands in parallel are used instead. Litz
wire takes this to the next level. Induction hobs use litz wire for instance, perhaps the
ultimate form of wireless power transmission!
Hello,
I think you should go with the flex circuit, it can be made ti fit where no design can. They are hybrid of ordinary design circuit board and round wire.
MarkT:
Normally litz wire would be used, and that's the very opposite of thick rigid conductors,
using lots of thin conductors braided so as to prevent the skin-effect from reducing the
effective conductivity of the coil.
Importantly, the wires are insulated from each other. Otherwise they just act as a more flexible equivalent to a solid wire.
The decision to use litz wire vs. solid will depend on the frequency you are using, the required efficiency, and the power levels.
Russell.
I thought I saw in a video that a thicker Solid wire core was better, but the author may have meant that it was better than the simple copper wire coils he had made. He didn't really say why or how the thick solid wire coil was better.
I'm not looking for anything too expensive to make, I'm just tinkering. But how about this way, what is the farthest power can be transmitted in a lab setup? I've seen videos of 6-8 cms using a pancake-like wound up insulated bunch of conductor.
Marciokoko:
ut how about this way, what is the farthest power can be transmitted in a lab setup?
Marciokoko:
But how about this way, what is the farthest power can be transmitted in a lab setup?
That question is like asking, " how long is a piece of string?".
You can transmit power any distance but above a short distance the power received will be inversely proportional to the square of the distance so will rapidly diminish.
Russell.
Right so I mentioned a "lab setup" giving the idea that I want to have a max range of about 10meters. But that is of course the dream.
The short distance after which it drops is the minimum. So what I'm asking is, can that drop-off be compensated by more coils, longer coils, coil material etc?
Marciokoko:
Right so I mentioned a "lab setup" giving the idea that I want to have a max range of about 10meters. But that is of course the dream.The short distance after which it drops is the minimum. So what I'm asking is, can that drop-off be compensated by more coils, longer coils, coil material etc?
Yes. A typical arrangement for a large area inductive pickup, is to place a long loop around the pickup zone. Sometimes with multiple turns.
But this will never work for power transmission. Only microwatts can be transmitted this way. Learn from Tesla. Maybe you should look up the "inverse square law" for EM waves.
For efficient power transmission you need to be in the near field region see Near and far field - Wikipedia it is beyond that region that the inverse square law is applied.
Russell.