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Re: Winding vs Space-Charge Capacitance
From: richard hull[SMTP:rhull-at-richmond.infi-dot-net]
Sent: Sunday, November 02, 1997 3:49 AM
To: Tesla List
Subject: Re: Winding vs Space-Charge Capacitance
At 11:53 PM 11/1/97 -0600, you wrote:
>
>From: terryf-at-verinet-dot-com[SMTP:terryf-at-verinet-dot-com]
>Sent: Saturday, November 01, 1997 4:44 PM
>To: tesla-at-pupman-dot-com
>Subject: Winding vs Space-Charge Capacitance
>
>Hi all,
>
> Testing I have done on secondary coils with no top toroid suggests that
>the secondary inductor's capacitance is composed of two main capacitances in
>parallel. The first capacitance is internal to the coil winding itself and
>is probably composed of turn-to-turn capacitance. The second capacitance is
>a large space-charge region that is developed around the top end of the
>coil. The first capacitance is in the order of 0.25 pF while the second
>capacitance is on the order of 6.3 pF.
>
>Coil length 29.0 inches
>Diameter 4.25 inches
>1000 turns #30 wire
>Non-Linear (winding pitch proportional to cos(x))
>inductance 16.06 mH
>Fo 496.2 KHz (no top terminal)
>Rac ~108 ohms
>Q ~460
>
>Note: Rac and Q may be inaccurate (unproven test methods).
>
>If this is true than it would suggest a number of possibilities to optimize
>output voltage. I am surprised that the turn-to-turn capacitance is so low.
>This is one of my non-linear wound coils but if the turn-to-turn capacitance
>is this low, I should be concentrating on field patterns and forget the
>internal capacitances. I haven't cross-checked these results so I may have
>a measurement problem or something.
>
> Does anyone have any comments on these results or comments on the
>small turn-to-turn capacitances I seem to be seeing.
>
>Thanks
>
> Terry
> terryf-at-verinet-dot-com
>
>
>Terry,
By what method did you arrive at the precise total turn to turn capacitiance?
Richard Hull, TCBOR
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