The Strongest Coil

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Vasile posted this 17 July 2017

Let's say we have 3 meters of wire,0.5mm in diameter and a ferite cilindrical rod(99mm long and 9mm in diameter).I want to make with these components,an electromagnet witch has the densest magnetic field measured at the sides of the core with a teslameter.

I don't want to change the core to improve upon my objective so what I can change is the wire winding(of course keeping the lenght constant with each coil I make so as to compare the results as fair as posible).So what I need is sugestions on what type of coiling technique works best for me.

Thank you.

 

P.S.: I will post pictures as experiments go by and an excel file where I will keep the records.

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Chris posted this 17 July 2017

The strongest Magnetic Field that a Coil can create is the Series Connected Bifilar Coil. The Image below:

The patent for this Coil explains why and also the Image gives some data why. But the Voltage between the Turns is Increased dramatically. These are interesting experiments to make. One will find that very quickly there are major differences from this coil to normal wound coils. They are perhaps a bit dangerous. I have lost equipment to these coils.

   Chris

 

Vasile posted this 17 July 2017

I'll stick to this one then.Also it would be interesting to have people involved in a project designed exclusively to change standard coils to this type that u posted.Image a dc motor with this modification.I believe at least the rpm will increase.

Thank you!

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alohalaoha posted this 18 July 2017

Hi Vasile

Yes Chris Sykes has right. Tesla bifilar coil is ultimate coil of production of vector and also scalar magnetic fields.Better design is simply impossible. This is simply genious design by greatest physicist ever NIKOLA TESLA.

You can try sixthfilar or octafilar version of same coil like Aviso used in his devices. Simply wrap around 6 or 8 wires very tight in form of wrapped up in spiral to make very strong capacitive coupling, between all wires, much higher coupling than using usual two parallel wires to each other as was pictured in Chris Sykes picture.

You can connect them in pairs of two like Tesla had done. In parallel - you will have 3 pairs or 3 pairs for serial connection if you are using 6 wrapped wires together or 4 and many pairs if you try 8 or more wires. you should make attention of start/stop markings of each wire. Trick is to make Tesla bifilar for very many parallel wires like it has for example in litz wires, but you dont connect them all at start and end point like it is usual in litz but in Tesla bifilar manner. End of one pair to befining of next pair with full turns of 180 degrees.

ps; i can suggest you. also this type of so called Kapanadze tensor coil like was shown in picture. you can see how to wind it. Its easy.

Best wishes

Aloha

 

 

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Zanzal posted this 18 July 2017

I want to make with these components,an electromagnet witch has the densest magnetic field measured at the sides of the core with a teslameter.

If I understand your objective and how this works correctly, I think your core material will have a maximum saturation point which you cannot exceed say .5T, so your goal would be to drive the material up to this point. If I had to guess how one might do this I'd probably start by using a series resonant circuit to drive the coil. If at series resonance the effective resistance of the coil should be zero and the maximum amount of current should flow. Or so I read somewhere...

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Vasile posted this 20 July 2017

Yes,resonance would help,but I wanted first to make the coil densest at DC and then if I was planing to use her with AC,bringing her to resonance would've helped.I feel this are the correct steps.

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perro555 posted this 19 September 2017

I've had great sucess with the coil as in Chris's suggestion but if you want to go a step further twist the 2 wires together (red and Blue) before you  wrap around as shown. Bedini does this with his coils. But make sure the connection are done the same way. once you wrap all the way down connect end of say blue wire to beginning of red wire so that the impact is double. i.e. current flows twice thru the same distance. I did an air core this way with solid house wiring and that thing pulls in metallic objects into itself using only 12- 24 volts from a capacitor bank really improves attraction. Now this is with an air core, imagine if you are using a solid core.

Wistiti posted this 19 September 2017

perro555 you are right I have also see it improve the magnetic...

Good remark!

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gnosticman posted this 20 September 2017

I really love that you bring up the solenoid-style bifilar.  Most people only consider the bifilar pancake, but if you read Tesla's original patent he specifies that it can be used for _any_ type of coil because of the pressures the bifilar configuration induces.

Chris posted this 20 September 2017

I really love that you bring up the solenoid-style bifilar.  Most people only consider the bifilar pancake, but if you read Tesla's original patent he specifies that it can be used for _any_ type of coil because of the pressures the bifilar configuration induces.

Hi Gnosticman,

Yes this is right! Reading the original Patent does very clearly show a turn to turn relationship!

This is Freaky!

A trait I have seen from a User TK, but anyway,,you're right. There is a Turn to Turn relationship, there is a capacity between each turn and the Charge between each turn is:

Q = CV

Partnered Output Cols do have a Capacity, I have not been able to entirely work out the capacity yet.

Note: There is truth to me not having as much information as I should, I have tried so long, but I still do not have all the answers! I wish I did! If I was a bit smarter maybe I would! Perhaps some expect too much, perhaps I have not done enough to solve all the secrets to the riddle?

I am not an EE Guru, wish I was!

I know enough to get by, to make simple stuff work!

   Chris

 

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alohalaoha posted this 20 September 2017

The most simplest way to boost up magnetic field for any electrical machine need it is to use wire with higher Specific resistance than cooper.

For example for a given lenght of 1meter. diameter 2,5 mm, same Nichrome wire or nickel-chrome alloy wire will have several times stronger magnetic field in comparison to same wire with same diameter from cooper. for a same giving current density for example from accumulator source 12V, 30Ah.

Simple experiment 2 wires - Cu and NiCr 1meter in lenght, same diameter 2.5mm, 1 accum.battery 12V/30Ah, 1 oscilloscope, 1 hall-effectl sensor, 1 resistor 10 om 10W. Just setup and meassure. Same conditions for both, same setup voltgae and current but very different magnetic fields around. As you guess specific resistance is responsible for this difference.

Off course using complex winding techniques like Tesla bifilar, magnetic field can be boosted more higher. The trick is to make much complex 3D formes like Tesla have had in his experiments with so called Radiant cone. There is one particular picture of it with Pure Silevr Radiant Rays running from the top of his bifilar or maybe multifilar Radiant cone. If you get violet or bluish rays it means you have no radiant but electron flow. Keep your head and hands from high energy electron field.

Read Tesla - he is Radiant Guru #1.

NIKOLAI TESLA - Electrical Experimenter Magazines.zip
https://yadi.sk/d/yraaLJWodjjn2

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