Re: Voltage determination

[Terry Fritz <twftesla-at-uswest-dot-net>]

Hi Tom,

	The "Vs = Vp sqrt(Ls/Lp)" is a very standard Tesla coil equation.
Personally, I divide the Vs voltage by 1/2 to allow for the source and load
impedance of a real coil.  Thus, I use:

Vs = 1/2 Vp SQRT(Ls/Lp)

This is really fairly close in most coils (Vs is a peak voltage).  However,
your coil would still be 2.5 million volts which still seems too high!
What are Vp, Ls, and Lp for your coil?  

Cheers,

	Terry



At 09:34 AM 7/26/00 +0200, you wrote:
>John
>When I take your formula,I have over 5 million Volt.A little much for a
>6"x25" secondary,don't you think ?
>
>Tom
>
>----- Original Message -----
>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: <tesla-at-pupman-dot-com>
>Sent: Wednesday, July 26, 2000 2:49 AM
>Subject: RE: Voltage determination
>
>
>> Original poster: "John H. Couture" <couturejh-at-worldnet.att-dot-net>
>>
>>
>> Bart -
>>
>> It is a well known fact that the secondary coil inductance affects the
>> length of the output spark. This is the main reason that 1000 turns are
>used
>> instead of 100 turns for a Tesla coil. The 1000 turns gives more
>inductance
>> and longer sparks. Of course there are many other design considerations.
>The
>> theoretical equation is
>>    Vs = Vp sqrt(Ls/Lp)
>> Note that when Ls is increased the secondary voltage Vs is increased which
>> in turn increases the spark length. The factor I used is non linear and
>> obtained from empirical data and using mathematical regression.
>>
>> Empirical Tesla coil design is a complex combination of many parameters
>> involving both theoretical and empirical equations. The Tesla coil output
>> spark length equation is obtained from empirical data and subject to many
>> variations.
>>
>> John Couture
>>