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Old August 15th 19, 08:41 PM posted to rec.radio.amateur.antenna
John S John S is offline
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First recorded activity by RadioBanter: May 2011
Posts: 550
Default A question about two coils on one form

On 8/15/2019 8:46 AM, amdx wrote:
On 8/14/2019 7:11 AM, John S wrote:
On 8/13/2019 9:29 AM, amdx wrote:
On 8/9/2019 8:06 AM, John S wrote:
On 8/8/2019 11:45 AM, amdx wrote:
Hi all,
If you put two coils on one form, but wind one in the opposite
direction, Do the currents flow in opposite directions?

Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* Mikek

PS. opposite winding direction as in clockwise or counter clockwise,
Â*Â*or like a left hand and right hand thread.

If it is a continuous coil with only two connections (start to
finish) but winding is reversed in the middle of the coil, the
current does not reverse.

Â*Â*That wasn't what I ask, but since I posted I did put an answer
together. It took me several drawing to get to a final answer that
makes it so simple I don't know why I ask the question. I took me
several hours to come to the conclusion though.
Â*Â*My answer to your question would be, the current does reverse and
for your example, the current would be very low. Probably not zero
because of time/phase concerns.

I have one drawing showing a coil and the right hand rule that gives
the answer.

file:///C:/Users/Lamont/Dropbox/contra%20wound%20coil%20with%20flux%20and%20curren t%20flow.jpg



Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* Mikek


The current can not reverse in a series connection. But the magnet
field can reverse in the two series windings if one of the windings is
reverse wound.


Â*I should have added more information.
The coil(s) are put in an electromagnetic field, creating a magnetic
field around the coil. the magnetic field creates a current in each coil.
what is the direction of each of those currents?
https://www.dropbox.com/s/c4k2hh4syd...0flow.jpg?dl=0


Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* Â*Â*Â* Mikek
PS, it took me hours to get this understood and now, it's like, well ya!


Ok. You have all the answers so go with that. Good luck.