Re: Space Winding - was What to look for...

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <FutureT-at-aol-dot-com>

In a message dated 7/13/01 10:49:50 AM Eastern Daylight Time, 
tesla-at-pupman-dot-com writes:

> > There are, of course, pros and cons to space winding secondaries.
>  > Some say that space winding is better due to the proximity effect
>  > of the neighboring windings, which is supposed to cause increased
>  > losses. However, the inductance density is also decreased by space
>  > winding and this is not a good thing.
>  
>  Excellent point. I remember discussing this in the past (remember trying to
>  wind
>  two identical coils where one is space wound and the other is closewound?).

Bart, David, all,

One can use thinner wire for the spacewound coil, and keep the
inductance high, yet reduce the proximity effect.  According to
Terman and other experts, such a coil will show lower losses
than a closewound coil with thicker wire, both having the same number
of turns, and the same coil length.  A 50% to 70% wire "fill" factor
was deemed to be best.  

John Freau