Re: EMI

To: tesla-at-pupman-dot-com
Subject: Re: EMI
From: Bert Hickman <bert.hickman-at-aquila-dot-com>
Date: Wed, 25 Sep 1996 06:57:58 -0700

Tesla List wrote:
<SNIP>

> A possibly silly suggestion, in re construction of capacitors:
> 
>         It was mentioned that stacking up multiple sheets of dielectric, to
>         get higher withstand voltages, created difficulties, in that the
>         sheets slid around.
> 
>         Would it be possible/desirable to temporarily bond the sheets together,
>         say along one edge, to avoid this?  Using heat, or solvents, or
>         whatever, possibly even leaving an extra strip of dielectric for the
>         purpose?  Once the assembly was complete, the 'extra' strip might be
>         cut off, avoiding any potential (8)>>) problems with the eventual
>         voltage stress on the modified area?  (Or simply make the sheets
>         oversize, so that the 'bonded' area was outside the area subject to
>         high fields?)
> 
> regards
>         dwp

Because the outermost sheets always have a larger circumference per turn
than the inner sheets, either the dielectric material must
stretch/compresss to compensate, or they must be allowed to slide
relative to each other. If you try clamping an edge, the dielectric
won't wind straight and you'll get creases where there's excess
material. 

-- Bert --