Re: [TCML] Interesting Coil Wrap

[FIFTYGUY@xxxxxxx]

In a message dated 8/2/08 8:48:59 P.M. Eastern Daylight Time,  
drieben@xxxxxxxxxxx writes:

>Sounds an awful lot like a bi-polar coil ;^) Both ends of  the

>secondary coil are "hot" and neither end is grounded. They  are

>wound in opposite directions so that the two hot ends of  the

>secondary are 180 degrees out of phase and will spark  towards

>each other.


    I don't understand why some people say to wind  the two halves of a 
bipolar secondary in opposite directions. After all, in a  non-bipolar TC, the 
secondary is continuously wound in one direction, and  getting the top to be at 
the maximum potential difference from the bottom is  pretty much the goal. In a 
bipolar, the magnetic lines of force, the secondary  winding direction, and 
the resultant current are in the same relationship  throughout the entire 
secondary (both halves) if it's wound in the same  direction end-to-end.
    If it was necessary, look at the windings in any  transformer you can 
examine. They don't change winding direction halfway  through. 
    For that matter, if it was important, it would be a  lot easier to change 
the winding direction of half the helical primary (so as to  just wind the 
secondary in one direction). Now that doesn't make a lot of sense,  so why would 
you wind half the secondary in an opposite direction?
    I did some poking around in the archives, and I  can't find anybody who 
actually wound their bipolar secondary in opposite  directions. Ryan said he 
saw this interesting design on the Internet. Got a URL  address so we can all 
check it out?
    FWIW "bifilar" usually means two windings  simultaneously wound alongside 
each other in the same direction so they are  interleaved, regardless of 
relative current flow. Of course the current flow may  be chosen to be in the same 
or opposite direction, depending on what you want to  do! 
 

-Phil LaBudde
Center for the Advanced Study of Ballistic  Improbabilities



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