Multiple coil winding-Current Flow and Magnetic Fields

  • Last Post 20 December 2020
drago posted this 19 December 2020

Hello mates.
How is it going?
Now....As reading the forum my understanding grows...but also the number of questions I have.
I love the Original Bucking coil Picture that Chris has,and all others...however...we see 1 single winding.
In the quest to build a ,as perfect as it gets must understand how multiple winding with different current flow affects the magnetic field.

As you see in this picture,another 1 wrap coil...the direction of current is simple,and so we can see that we have a north and a South pole.
As we do not have any more space on the core,as we try to make the magnetic field denser, we must wind the coil in the opposite direction...from TOP to BOTTOM.
In this situation as CURRENT direction changes from BOTTOM- TOP to TOP-BOTTOM ( in the second round  wrap )...we will have a change in the magnetic field polarity.

I am sure for many of you guys this may be a silly question,but how should we wind our coil so that when we do not have any copper wire in the the END Game...the COIL as a whole can have 1 N and 1 S ?

Thank you very much and keep up the good work. !
Much Love. 

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cd_sharp posted this 19 December 2020

Hey, Drago, You said "current direction changes", but that's not entirely true. As long as you keep the loop polarity, you can wind as many layers as you need on top of each other. The magnetic field would add, no matter if the current flows upwards or downwards. Stay strong!

"It's just the knowledge of the coils and how they interact with each other" (Steven Mark)

Vidura posted this 19 December 2020

Hey Drago, I understand what you are pointing out. It is not the magnetic polarity that changes in this case, but you will have one layer in clockwise sense, and the next counter clockwise. N-S polarity will remain the same according the right hand grip rule, but it might change some properties related to the A vector field. Another winding pattern is from bottom to top and then take the wire straight down again and make other layer to the top, so you will sustain an unique curl. Regards Vidura.

Chris posted this 20 December 2020

Hi Drago,

In any Symmetrical System, there is always Action, Reaction pairs! They are always equal in Magnitude, and Opposite in Direction.

The best way to learn is on the bench! A simple experiment can very easily probe this on the bench. Wind your Coils, load the secondary and test as you have described.

You will find, the Secondary will Oppose, in both Magnetic Field, and Current Direction, the Primary.

Winding Direction can make a difference to performance. I have shown this here: Some Coils Buck and some Coils DONT

An Asymmetrical System will behave quite different, if you let it.

Experiment is key to understanding rational machine and this is a simple one to experiment with. Prove to yourself what occurs!  Please post your results.

Best Wishes,



P.S: The Right Hand Grip Rule is important to know about and understand, it does give Current and Magnetic Field Polarity! See Floyd Sweet's Nothing is something for Reference:

Consider for a moment the construction of the triode which includes the bifilar coils located within the fields of the two conditioned magnets. 

When the current in one half of the conductors in the coils (i.e., one of the bifilar elements in each coil) of the device is moving up, both the current and the magnetic field follow the right-hand rule.


The resultant motional E-field would be vertical to both and inwardly directed.

At the same time the current in the other half of the conductors in the coils is moving down and both the current and magnetic field follow the right-hand rule.


The resulting motional E-field is again vertical to both and inwardly directed.

Thus, the resultant field intensity is double the intensity attributable to either one of the set of coil conductors taken singularly.

Expressed mathematically: E = ( B x V ) + ( -B x -V ) = 2 ( B x V )

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