Re: primary position (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 19 Jun 2007 15:12:31 -0400
From: Marko Ruban <Marko@xxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: primary position (fwd)

In that case, would a middle grounded secondary with primary around same
location, be more efficient than the traditional primary/secondary bottom
grounded?


Tesla list wrote:

---------- Forwarded message ----------
Date: Tue, 19 Jun 2007 07:51:15 -0400
From: "Lau, Gary" <Gary.Lau@xxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: RE: primary position (fwd)



  

Date: Mon, 18 Jun 2007 14:41:47 -0400
From: Marko Ruban <Marko@xxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: primary position

All of the cylindrical secondary designs I've seen (which is not
    

many),

It seems to me that >99% of all coils that I've seen DO use cylindrical
secondaries...

  

place the primary coil at the bottom of secondary.  Would placing the
primary at the center of secondary improve TC efficiency, by letting
    

the
  

secondary take advantage of the lower part of magnetic field produced
    

by
  

primary?
    

Two problems with this.  Since the base of the secondary is grounded,
the mid-point would be at a potential of half its peak voltage, and it
would want to arc to the nearby primary coil.

Also, the pri-sec coupling would likely be too high, resulting in racing
arcs on the secondary coil.

Bipolar coils, where neither end of the secondary is grounded, do have
the primary at the secondary mid-point.   

Gary Lau
MA, USA