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Re: [TCML] Magnifier topics
Paul
Very interesting modeling results!
I can isolate the RF ground line to the driver secondary from the
primary/IDR
ground connection. This will allow a comparison of base current via a
resistive
shunt or CT with peak reading circuit. It will be very interesting to see
if
there is a base current (i.e. resonator drive current) increase with and
without
the IDR ring.
There is some very good news here as well, it appears on surface that there
will be no severe voltage gradients laterally up the driver secondary with
the
IDR based on preliminary modeling, even with magnetic augmentation between
the IDR and the primary.
I've about got all the detail drawings for the primary/IDR ring assemblies
complete
in CAD. Hope to start fabricating parts next week. I have a proposed "name"
for
this system if it is successful; our Aussie friends would fully understand
the
reasoning for it... ;^D
Many thanks for running a quick "sanity check" modeling drill on this new
system!
Best Regards
Dave Sharpe
On Sat, Feb 27, 2010 at 8:44 AM, Paul Nicholson <tcml88@xxxxxxxxxxx> wrote:
> This morning I had a bash at modelling David's flux-concentrating primary.
>
> Using acmi to calculate the mutual inductance network with the
> drive ring represented by 20 concentric filaments, a spice network
> is generated which is used to determine the current distribution
> across the ring and the induced voltage gradient on L2.
>
> This model doesn't take into account distributed capacitances.
> Nor does it realistically model losses.
>
> D = Primary separation from plate, cm;
> L = Combined primary inductance, uH;
>
> D L
> 2.54 84
> 5.08 78
> 7.62 74
> 10.16 71
>
> With drive ring removed,
>
> D L
> 2.54 102
> 5.08 89
> 7.62 81
> 10.16 76
>
> Inductance of each primary: 31.3uH
>
> The following graph shows the secondary voltage gradient induced
> by one volt across the series primary, for four separations of
> primary to flux concentrating ring, plus an additional plot
> with the ring removed so that the secondary is just driven
> by the two primary coils 5.08cm apart.
>
> http://abelian.org/tssp/tmp/ds100225sk.png
>
> The base of the secondary was set level with the ring.
>
> Here is a graph showing the current distribution across the
> flux concentrator for four primary separations,
>
> http://abelian.org/tssp/tmp/ds100225id.png
>
> Current in the positive direction is flowing the same direction
> as in the primary coils. As you can see, the current in the inner
> 4cm of drive ring is reinforcing that of the primary. It is also
> very large!
>
> I've no idea whether these calculations are correct - nothing
> to check them against, but they seem qualitatively reasonable.
>
> --
> Paul Nicholson
> --
>
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>
--
Dave Sharpe, TCBOR/HEAS
Chesterfield, VA USA
Sharpe's Axiom of Murphy's Law
"Physics trumps opinion!"
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