Steven Mark`s TPU

[z_p_e]

I almost forgot....

I also have it on good source that Litz wire is braided to cancel the magnetic fields.  That might help out the cannon ball effect, as induction onto the collectors zips them along, faster and faster!   

Litz is a TPU builders best friend. 

Merry Christmas,
Bruce

Bruce,

The magnetic fields are not canceled at all. You would only achieve this if half the conductors were the return path.

The purpose of braiding the separate conductors of a Litz wire is to maximize equal current and flux sharing among the many conductors. The magnetic field is still present around the conductor group, as it would be in a standard multi-strand conductor.

Eddy currents (and hence skin effect) are reduced due to the insulated individual conductors. The magnetic field IS NOT canceled. Braiding causes averaging of each magnetic field

[eldarion]

Yes, here it is:
http://www.overunity.com/index.php/topic,3660.msg62585.html#msg62585

I will be building one of these with Litz wire...stay tuned!   (I should have it done in a couple of weeks--waiting for the Litz to arrive)

Eldarion

[EMdevices]

Bruce, zpe is right, 

I also believe that the "many conductors" that the magnetic field will "cut" are not necessarily the many strands of wire in the braided Litz wire.  I would think this refers to the number of actual loops of wire, whatever it might be made of.  It's all about finding that "circuit potential"     

EM   

[eldarion]

@z_p_e,

Here is one reference that says that yes, the magnetic fields of the individual Litz strands are cancelled:
http://books.google.com/books?id=IiF5j4ItsfYC&pg=PA283&lpg=PA283&dq=litz+cancel+magnetic+field&source=web&ots=fVphzkDGbY&sig=HjUVi61mYe4MPcu9Q8Pnl5k1rnA
(Scroll down to the bottom of page 283)

Just something to think about.

Eldarion

[z_p_e]

Hi eldarion,

Drawing a few circles on a piece of paper does reveal that the fields internal to the overall outside surface do seem to cancel.

I guess I was thinking more in terms of any field detectable outside the wire as a whole. Of course it is still there. So internally, they do seem to cancel.

Which brings up something unrelated....two parallel conductors are supposed to attract each other when their currents are in the same direction (as would be the case in Litz wire), but as the fields appear to oppose in Litz wire, one would think that they would repel rather than attract?