Re: Time constant between primary and secondary (fwd)

---------- Forwarded message ----------
Date: Wed, 17 Dec 1997 12:01:53 +1200
From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Time constant between primary and secondary (fwd)

Hi Alfred,

> Date: Tue, 16 Dec 1997 16:51:44 -0500
> From: "Alfred C. Erpel" <aerpel-at-op-dot-net>
> To: Tesla List <tesla-at-pupman-dot-com>
> Subject: Time constant between primary and secondary
> Hello All,
>     I understand that the primary and secondary frequencies should be
> identical (1 / 2 pi sqrt(LC)).  But it seems to me that the L/R of each
> circuit should also be identical also so that the current rise graphs of
> both coils look the same.  This would seem to me to be the condition
> necessary for optimal energy transfer.  Is this true? 

No. For a start, the coils will never be the same until a secondary 
discharge issues. The primary includes a sparkgap as part of its 
circuit. Besides, with overcoupling you get transfer efficiencies 
climbing to the 90% mark if gap currents are kept fairly low.

> Maybe I have just
> missed reading about this so far.  Also I would venture that there is an
> optimal relationship to seek between the time constants and the operating
> frequency (peak to peak time) so one isn't "waiting" for the other.

Can you be more specific?