How far can I Wirelessly Transfer Power? (Experiment) Better than at MIT?
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Date: 2021-09-12
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Comments and reviews: 10
David
Since electromagnetic waves radiate in all directions the power available at any point away from the source will decrease with the square of the distance. This is true for typical point sources of radiation.
If however, a collimated beam can be formed then the inverse square rule becomes less of a factor while aligning the beams becomes an increasingly important factor.
With a collimated beam it should be possible to wirelessly transmit power over great distances at high efficiency so long as the transmitting and receiving antennas are well aligned.
I used to work for Detroit Edison as a contractor in their communications department. One of the things I did in that job was to perform routine maintenance on their several microwave links between their properties. These were microwave T-1 links that were beamed between properties with low power, very high Q parabolic dish antennas.
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Since electromagnetic waves radiate in all directions the power available at any point away from the source will decrease with the square of the distance. This is true for typical point sources of radiation.
If however, a collimated beam can be formed then the inverse square rule becomes less of a factor while aligning the beams becomes an increasingly important factor.
With a collimated beam it should be possible to wirelessly transmit power over great distances at high efficiency so long as the transmitting and receiving antennas are well aligned.
I used to work for Detroit Edison as a contractor in their communications department. One of the things I did in that job was to perform routine maintenance on their several microwave links between their properties. These were microwave T-1 links that were beamed between properties with low power, very high Q parabolic dish antennas.
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Some
Question. Does the coil need to be copper? Can it be hollow? Would hollow make it better or worse?
I was thinking a coil of automotive tubing (steel) which conveniently has a protective coating on the outside that might be an insulator. If that doesnt work then a coil of copper tubing.
Also if the tubing was filled with something like say water. salt water. steel BBs. something like that might give a larger core without added cost of large copper wire.
I think aiming for ludicrous frequencies would be a good video. I just wonder if at some point you end up coupling to every coil in every transformer in your equipment: p oopsie.
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Question. Does the coil need to be copper? Can it be hollow? Would hollow make it better or worse?
I was thinking a coil of automotive tubing (steel) which conveniently has a protective coating on the outside that might be an insulator. If that doesnt work then a coil of copper tubing.
Also if the tubing was filled with something like say water. salt water. steel BBs. something like that might give a larger core without added cost of large copper wire.
I think aiming for ludicrous frequencies would be a good video. I just wonder if at some point you end up coupling to every coil in every transformer in your equipment: p oopsie.
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Curt
lol, So all of that to tell us you are better off making it like an HF radio and antenna to transmit power wirelessly. like we have been doing since the 1800's.
Your loop antenna is directional by the way. and that is what you wanted to get away from. try dipole antenna or better yet a 5/8 wave ground plane antenna will get a low elevation radiation pattern and omni directional, because you are not trying to charge things on the ceiling. a yagi in vertical orientation would work well for one direction and you can adjust the vertical angle with the number of elements. just some thoughts. Great video!
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lol, So all of that to tell us you are better off making it like an HF radio and antenna to transmit power wirelessly. like we have been doing since the 1800's.
Your loop antenna is directional by the way. and that is what you wanted to get away from. try dipole antenna or better yet a 5/8 wave ground plane antenna will get a low elevation radiation pattern and omni directional, because you are not trying to charge things on the ceiling. a yagi in vertical orientation would work well for one direction and you can adjust the vertical angle with the number of elements. just some thoughts. Great video!
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Ioannis
I like your approach to problem solving in your videos, keep up the good work.
Some suggestions for future IPT videos:
- Try going to MHz switching frequency to maximise link efficiency (13. 56 MHz is a good point overall, GaN devices can help you achieve this.
- Try driving your transmitter with resonant inverters (Class E or Class EF, since they provide higher efficiency (95%+ is possible) at high frequencies and low THD.
- You can get very high Q's (around 1000, by using copper plumbing tube for coils, just make sure to keep the number of turns low to minimise radiation.
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I like your approach to problem solving in your videos, keep up the good work.
Some suggestions for future IPT videos:
- Try going to MHz switching frequency to maximise link efficiency (13. 56 MHz is a good point overall, GaN devices can help you achieve this.
- Try driving your transmitter with resonant inverters (Class E or Class EF, since they provide higher efficiency (95%+ is possible) at high frequencies and low THD.
- You can get very high Q's (around 1000, by using copper plumbing tube for coils, just make sure to keep the number of turns low to minimise radiation.
reply
Sir
Be carefull what you say and show because Nikola Tesla wanted too wireless energy for everyone and the big companies didnt like that and so they started campaign to defarm him and saying that hes crazy and because all of that everybody leaves Tesla alone and he died alone and in the newspapers/media they always said hes crazy old men. Telsa was a great human beeing with fantastic ideas and inventions, if he just had a chance back then, we would have yet a great Future.
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Be carefull what you say and show because Nikola Tesla wanted too wireless energy for everyone and the big companies didnt like that and so they started campaign to defarm him and saying that hes crazy and because all of that everybody leaves Tesla alone and he died alone and in the newspapers/media they always said hes crazy old men. Telsa was a great human beeing with fantastic ideas and inventions, if he just had a chance back then, we would have yet a great Future.
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Don
I am curious if stranded v. solid copper wiring in the coil make a difference. Or maybe even each coil being a different wire? There is something i heard about high frequency and skinning effect. I think that might be an advantage for the transmitter coil in the high MHz+ frequency range, and maybe solid or stranded receiver coil doesn't matter? Love the video, as always, i am left more curious than before watching, and i now know a lot more. Thanks and keep it up.
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I am curious if stranded v. solid copper wiring in the coil make a difference. Or maybe even each coil being a different wire? There is something i heard about high frequency and skinning effect. I think that might be an advantage for the transmitter coil in the high MHz+ frequency range, and maybe solid or stranded receiver coil doesn't matter? Love the video, as always, i am left more curious than before watching, and i now know a lot more. Thanks and keep it up.
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ejonesss
not only skin effect but radio interference.
home built circuits (unless you are a very good expert in electronics) can produce radio interference that can step onto the toes of many rf devices in the 0 to couple mhz range like radio location, land mobile, weather satellites and even in some of the lower ham ranges especially if you use used parts salvaged from junk electronics as the used parts can have values outside their original specs.
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not only skin effect but radio interference.
home built circuits (unless you are a very good expert in electronics) can produce radio interference that can step onto the toes of many rf devices in the 0 to couple mhz range like radio location, land mobile, weather satellites and even in some of the lower ham ranges especially if you use used parts salvaged from junk electronics as the used parts can have values outside their original specs.
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transistorbrains
If you wanted to carry this experiment further in the future, you could add variable capacitors (preferably controlled via microcontroller) and then set up tests that will sweep through frequencies and capacitances until you get your maximum power throughput for given coil specs. Should be able to create some nice graphs similar to the ones for the commercial coils.
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If you wanted to carry this experiment further in the future, you could add variable capacitors (preferably controlled via microcontroller) and then set up tests that will sweep through frequencies and capacitances until you get your maximum power throughput for given coil specs. Should be able to create some nice graphs similar to the ones for the commercial coils.
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Alex
Curious and fascinating (and OLD; Tesla worked on this theory a century ago. I'm wondering; could two independent transmitters increase the distance or power? Seems like it could, but I'm also thinking that some phase-locking would be helpful at the transmitters, so that they transmit at the same frequency AND phase. Would this reduce interference patterns in the EM field?
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Curious and fascinating (and OLD; Tesla worked on this theory a century ago. I'm wondering; could two independent transmitters increase the distance or power? Seems like it could, but I'm also thinking that some phase-locking would be helpful at the transmitters, so that they transmit at the same frequency AND phase. Would this reduce interference patterns in the EM field?
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Abhav
What if we decrease the size of the receiving coil? As the area of the transmission coil is more and the receiving coil is less, The receiving coil will be able to intercept a much larger flux as it is a comparatively small coil. But will this influence help while Increasing the distance?
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What if we decrease the size of the receiving coil? As the area of the transmission coil is more and the receiving coil is less, The receiving coil will be able to intercept a much larger flux as it is a comparatively small coil. But will this influence help while Increasing the distance?
reply
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