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Re: SRSG,RSG, shtuff...



Tesla List wrote:
> 
> Original Poster: "Lau, Gary" <Gary.Lau-at-compaq-dot-com>
> 
Snip, agree
> 
> Do not attempt non-sync operation with an NST (I've not attempted this but
> the List consensus is clear on this point). The only damage you might do to
> your NST with a sync gap is if the cap voltage is not high enough to fire
> the gap at every gap presentation.  This would cause the cap voltage to
> climb even higher, and this risks the NST.  The same problem can also happen
> if the motor phase is badly set.


But wouldn`t this problem be solved by the safety gaps firing?

Cheers, Finn Hammer
> 
> Regards, Gary Lau
> Waltham, MA USA
> 
>                 -----Original Message-----
>                 From:   Tesla List [mailto:tesla-at-pupman-dot-com]
>                 Sent:   Tuesday, April 25, 2000 1:21 PM
>                 To:     tesla-at-pupman-dot-com
>                 Subject:        SRSG,RSG, shtuff...
> 
>                 Original Poster: "sundog" <sundog-at-timeship-dot-net>
> 
>                 Hi all!  Mullng over a few things here, and needing further
> information.
> 
>                 I have a small AC motor that I would like to use for a
> *small* rsg. I only
>                 intend to use a 4kv30ma nst on it.  now, wintelsa says that
> the matched cap
>                 for that is .0199uf,
>                 or 19.9nf (i think i have the right number of decimals there
> ;)
>                 Before the criticism starts, yes, I could use a plain RQSG,
> but I love to
>                 tinker, and the 4kv unit will be less dangerous and a bit
> more tame, plus
>                 it'll be easier on my mmc.
>                 Anywho, my MMC (thanks Terry, the caps are *sweet!*), is
> 17.6kv, -at- around
>                 5nf a string. now, don't want to play wth resonant charging
> just quite yet.
>                 I did that once with the trashy cap (5nf on a 15kv30maNST),
> and while the
>                 cap died in a matter of moments (it was being tested to
> destruction), it
>                 juiced me good through the heavy-duty smitch I'd been using.
> Now I use
>                 contactors to break the mains, so all I'm holding is 13v-at-1A,
> much safer.  So
>                 I know that before it died, it really shot up there in V.
> Mmmkay.  I doubt
>                 I'll be using much more than a 4 or 5" disc, as the input
> power is small
>                 also.  Now, what kind of damage is this gonna do to my
> little NST? Since
>                 I'll be waay LTR (35nf, trying to avoid that 20nf range), I
> assume the nst
>                 will take the brunt of the pounding.  Will I simply destroy
> the nst if I
>                 even attempt this without grinding the motor for sync
> operation?  I haven't
>                 started on the disc yet, as I don't want to make a neat
> lookin' coaster ;)
>                 The motor will thankfully require only 2 flats.  It is a
> small motor tho.
>                 Originally started life as a fan, but it's got a decent
> amount of torque.
>                 That's the second reason I want to use a small disc.  A disc
> that small will
>                 probably need an air blast to help quenching, I assume.
> 
>                 soo, you all know what kind of um, insanity I'm about to
> attempt, 99% for
>                 the curiosity and experience of doing it. 1% for the noise
> :)  Ideas?
>                 Comments?  Snide remarks?
> 
> 
> Thanks for yer time!
> 
>                 Sundog - Relax and smile. It could be Monday.
>