Making Coils With Foils?

[elias]

Hello Everyone,

I was wondering, why don't we make coils with copper or aluminium foils.
Making coils with foils can make the coil more compact and efficient without any gaps, and with much less resistive impedance. I don't know if I can find coated foils somewhere, or I need to insulate the layers by using tape.

Consider making a coil by using a coil with a copper foil of thickness of about 0.1mm and width of about 50mm and about 300 turns, about 50 meters, which will result on approximately 0.15 ohms of resistive impedance, which will highly increase the efficiency of it, especially for charging Bedini Circuits.

Normal Aluminium Foils have a thickness of about 0.01mm and are too thin, but even with them one can build a coil of about 1000 turns and 10cm height, and a core of about 10mm and whole diameter of 30mm which is very small and light, but with high inductance and the resistance would be only 2.6 ohms.

This is one source I have found that makes these types of coils: Jantzen Audio Cross Coil copper foil

Any suggestions, or comments?

Elias

[sigzidfit]

elias,

I've made many things with the adhesive backed aluminum foil tape. You definitely want a roll of that in your survival kit. My most recent experiment was a wrap of the magic tape around a cfl cliped to av plug to watever.....got some good voltage and a little amperage it lit a led a little bit. Also, the roll of tape on the spool is a coil.

I guess RFID antennas qualify as foil coils too.

Theres some linear actuator motors that use foils...theres info maybe at rexresearch? They were used in flight simulators.

Peace
PJ

[sigzidfit]

here's that motor at rex

Phillip Denne -- Wireless Planar Motor

[elias]

Hi

Thanks for the input, this is what I found that seems to be a good guide on this subject: A Guide to Designing Copper-Foil Inductors Page of

Elias

[mklimesh]

Copper Foil Coils | FoilQ | ERSE

Insualted Copper Foils (Laminax)

Mike Klimesh

[rob.rice]

look up stained glass they use copper foil to wrap around the edges so they can be soldered tougher
it comes in one side sliver plated or both or bare 1to3 .000" thick from 1/16" to 1/2"
here is the down side of this stuff the adhesive may not work as a dielectric
one side is bare the rolls are only 120' long

aluminum has a higher magnetic moment than copper and may work better than copper in an inductor
I have been thinking that a pancake coil IS worth a try the only way to build one
and have every thing line up perfectly would be to use foil for the conductors

aluminum duct tape is cheep $17.00 for a 2.5"x300' roll by my guess that would be enough for 5 bedini ssg coils

[elias]

look up stained glass they use copper foil to wrap around the edges so they can be soldered tougher
it comes in one side sliver plated or both or bare 1to3 .000" thick from 1/16" to 1/2"
here is the down side of this stuff the adhesive may not work as a dielectric
one side is bare the rolls are only 120' long

aluminum has a higher magnetic moment than copper and may work better than copper in an inductor
I have been thinking that a pancake coil IS worth a try the only way to build one
and have every thing line up perfectly would be to use foil for the conductors

aluminum duct tape is cheep $17.00 for a 2.5"x300' roll by my guess that would be enough for 5 bedini ssg coils

Thanks,

I found a source where insulated copper foils are sold, I am going to buy and try it. And yes it seemed to me that making a coil this way will result in a three dimensional pancake coil, and thus, can be even used without a core I suppose.

Elias

[elias]

Some Tests

Hi,

Synchronisticly, someone handed me some suitable copper foils, with thicknesses ranging from 0.1 mm to 0.3 mm, and a width of about 40mm.
They were not that long, I managed to insulate them with tape, and build a 15 turn 3D pan-cake coil. I am satisfied, with the results, as It would become a very compact and efficient coil, and my crude measurements show that this type of configuration is at least about 20% more efficient.

I will be buying some foils to experiment with, I am especially interested in the recovery spike of these type of coils.

Elias