Re: srsg + mots - happy couple?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Paul Benham" <paulb@xxxxxxxxxxxxxxxxxxxx>

Hi Dmitry,

I have measured a few mot's before and after shunt removal.  I found that
the output impedance was around 2k with the shunts and around 600R without.
As a result I run with the shunts removed on mine.  I'll have to check my
notes but it was something like this.

MOT's are not the most efficient beasts but they still pack a punch.  The
best I have achieved is 81" from two MOT's as a power supply.  Your 4 MOT
supply should work very well.

For a charging inductor I use 4 MOT's secondary's in series, good for 10kV
or more.  It gives 14H once you have removed the I's.

Good luck,

Cheers,

Paul.



----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, October 24, 2005 1:46 AM
Subject: Re: srsg + mots - happy couple?


> Original poster: "Dmitry (father dest)" <dest@xxxxxxxxxxx>
>
>
>  > Original poster: Steve Conner <steve@xxxxxxxxxxxx>
>
>  >>here are the model of my psu:
>
>  > It looks great to me. My only question is where will you get the 20
>  > henry inductor that can withstand 10kV?
>
> hey, Steve - i think you`re able to do more difficult things than this
> one :-) and what`s the problem -  it`s 100hz hv, not hf. look - the
> insulation of an ordinary enameled wire can withstand more than
> 1000v, so for 10kv we need only 10 layers, but there would be also an
> insulation between layers,  that`s able to keep 1000v (i`ve got a
> whole bunch of the transformer paper, that`s impregnated  with
> something like paraffin). the only problem - insulation from the
> core, but i guess it wouldn`t spoil the deal - 5mm of the teflon
> would help us. or something is wrong with me again? :-D
>
> as for the 20H - everything depends from the mots Ls  - maybe we`ll
> need a 40H inductor, maybe  10H, or maybe we can keep even without it
> at all. i have to measure the coupling coefficient between the
> primary and secondary of each of my particular mot. i`m planning to do
> this in such way:
>
> 1. feed the primary, say, with 200v, then measure the voltage on the
secondary,
> x1=Usec/Upri
>
> 2. feed the secondary with, for example, 1900v, measure the primary
voltage,
> x2=Upri/Usec
>
> coupling coeff. K=sqrt(x1*x2)
>
> is it OK? i`ve thinked it out in 5 min, could you give me the advice
> how to make it more precisely?
>
> and one more question - i need Ls as much as possible - are the shunts
> influence this? they limit the flux between the pri & sec, but don`t
> accumulate the energy - is it the same as decreasing  Ls at large flux?
>
>  > Also, wouldn't it behave the same if you put the inductor in the
>  > primary side of the MOTs, reducing its inductance by the square of
>  > the turns ratio? (40:1 since it's a 4 MOT stack) The inductor current
>  > is discontinuous, so it shouldn't make much difference whether it's
>  > rectified or not.
>
> it wouldn't behave the same - because in such case the inductor adds
> the voltage not only to the capacitor, but on the primaries of mots,
> so in my case they`ll see 411 amplitude voltage instead of 268! and in
> case of full mains voltage there would be 480v, so - no, thanx :-D
>
>  > That might make it easier to find an inductor, but
>  > then again, having the inductor on the HV side protects the MOT stack
>  > from spark gap transients so it might be better.
>
> the inductor can protect us only from the _current_ transients, not
> voltage - isn`t it? anyway - do the mots need such protection? a
> friend of mine has killed an nst, in the list  archives people are
> killing nst very often, not a long before there was a topic "not again
> - i killed  this puppy :-(" - i hate nst based psu and i want to make
> my own one - more better.
>
> "When running an NST through a Variac, the optimal phase setting of the
> SRSG will vary depending on the Variac setting."
>
> it`s crap.
>
> "Additionally, NST's are not the well-behaved linear devices that
> intuition and simulation models would have us think."
>
> even greater crap. why people must fight with such crap? they deserve
> better lot - MOT :-D
>
>
>
>
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