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RE: Silly question?
Original poster: "Loudner, Godfrey by way of Terry Fritz <twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>
Hi Marc
The cores are ok for a HV transformer. I have three dental x-ray
transformers with cores of the same oval shape. The HV section is divided
into two coils located on the center leg. Beneath each HV coil is a
primary. Each HV coil has one lead grounded to the core. The x-ray
transformers are essentally NSTs, but with no current limiting features.
Contact Mike at e-mail address arcsnsparks-at-parlorcity-dot-com and ask him to
e-mail you his transformer design engine. The design engine is not on the
web. You can down load Mike's engine that calculates approximate
parameters for square and EI cores. You can consider your core to be an EI
core.
Godfrey Loudner
> -----Original Message-----
> From: Tesla list [SMTP:tesla-at-pupman-dot-com]
> Sent: Wednesday, September 26, 2001 11:08 PM
> To: tesla-at-pupman-dot-com
> Subject: Re: Silly question?
>
> Original poster: "Metlicka Marc by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <mystuffs-at-orwell-dot-net>
>
> Matthew,
> I'm concidering winding a somewhat "super nst" on one of the
> back to
> back, oval shaped, high silicone steel cores that the 40-1
> transformers
> i found are built with?
>
> http://www.fortunecity-dot-com/meltingpot/syria/1210/id26.htm
>
> (top of page one with big taps on it)
>
>
> They have a 1" x 3" x 12" high x 4.5" inside width gapped
> cores that are
> gapped in the center (like this -00-) 6 sq. in. center leg.
> I was
> thinking of winding each oposing hv bobin for the outside
> legs of the
> "ovals", these would be around 10" long and i could use
> hevier wire then
> an nst (like 22g or something). then put the primary around
> the back to
> back center legs?
> With the bobbins being so long, wouldn't the hv stress be
> lower from
> layer to layer? Wouldn't this help with cooling because they
> would be
> reletivly thin?
> I was going to wait until i was about ready and then start
> asking the
> list for advice, I found some long rolls of .030" thick
> polystyrene
> sheet that is 22" wide by 100' long and clear, I will buy
> all five rolls
> tomorrow (I also want to build a polystyrene flat plate cap
> to test in
> tc duty with some?) at $4.50 a roll, i don't want to pass it
> up.
> I was thinking about using a layer of this between each
> wound layer of
> the high voltage coils? (if the list thinks it will be a
> good idea? or
> maybe use epoxy on each layer? (i would like it to be a dry
> type hv
> trans. when done?)
> It would be nice if i could get around 40kv-at-300ma when
> finished, would i
> need to use shunts to keep it current limited?
>
> I never wound an nst style transformer before, but i think
> this is a
> good core to try it?
> There will be more questions as i get ready, i just hope it
> isn't a
> wasted effort because the core style is wrong?
> suggestions are apreaciated,
> Marc M.
>