Thank You, and Bert for an excellent primers. When I studied electronics, we
used slide rules, really, to solve phase angles. And the power supplies of
the day were almost exclusively linear. My confusion was transformer faces
are milled to be flush. Indeed all inductors seem to have some air gap based
on application. My first CP/M computer had a really big linear power supply
in it and was the size of an apartment refrigerator. This was later upgraded
by models with switched powers supplies which drastically reduced the size
and weight. It is clear that switched mode power electronics has come a long
way since then and is a vital area of study.
Tesla would be shocked as would my long gone electronics teacher that many
main transmission lines run DC to lower losses via rectifiers and inverters!
But Edison was still very wrong ;-^)
Thanks for the boot strap. I have had my head in an old HV power supply that
is from WWII days or before for a couple of weeks now. Getting to the
charging inductor has opened some new doors! This will probably be my last
go at big iron.
I do plan on learning more about SS Tesla coils in the near future and
building a fiber optic isolated modulated one.
Jim Mora
-----Original Message-----
From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Colin Tregenza
Dancer
Sent: Wednesday, August 20, 2014 6:30 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] was: How I modified the 3 phase for dual wye 5KV 2xI;Now
charge inductor physics.
This page has a good summary of the pro's and con's of gaps in inductors, in
particular the trade off between preventing destructive saturation vs
reduction in inductance.
http://info.ee.surrey.ac.uk/Workshop/advice/coils/gap/
-----Original Message-----
From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Jim Mora
Sent: 20 August 2014 08:29
To: 'Tesla Coil Mailing List'
Subject: Re: [TCML] was: How I modified the 3 phase for dual wye 5KV 2xI;
Now charge inductor physics.
Hi Bert, Phil,
Not to get too esoteric, but this is of some interest since I am going to
try and build a reasonable decent one(s). I understand we want the wire
resistance at a minimum, but inductors come in different flavors such as the
swinging choke used in older (ancient to some) B+ amplifier supplies. It
tends to be a gapped choke to compensate for the DC that is always present.
Standard inductors are not gapped to my knowledge. Some physics forums
debate if there is energy stored across the gap. More simply put, would an
inductor sized not to saturate at the extreme current peaks or a gapped
inductor (both assuming low DC ohms) be the more ideal charge inductor?
Indirectly we are entering the gap debate I suppose. I see it as the energy
stored in the magnetic field which a gap would tend to decrease? I suppose
it comes down to a compromise. I'm curious how those radar inductors are
designed in this sense. Yours is a beast!
Jim Mora
-----Original Message-----
From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Bert Hickman
Sent: Tuesday, August 19, 2014 8:20 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] How I modified the 3 phase for dual wye 5KV 2xI
Hi Phil and all,
Phil wrote:
> (I've jumped around a bit too different emails here, hope you can
> follow)
>
> Bert's figures in this vary from what Richie's figures give. Now I
> know
that
> assumes the calculator faithfully reproduces Richie's formulas, but
> I'm certain after a lot of testing it does, so who's right, Richie or
Burt?
> I realise the smoothing cap will vary with 3 phase AC admittedly, but
after
> it's rectified it's all DC regardless, so the inductor and tank cap I
would
> consider to be the same as for our single phase AC input.
The biggest difference between Richie's model and the spreadsheet calculator
is that I use a lossy charging circuit model that takes into account
charging inductor losses. <snip>
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