Re: Building a bridge ...

On Tue, 22 Aug 2006 04:09:09 GMT, carl mciver <cmciver@xxxxxxxxxxxxxx> wrote:
"Snag" <snagone@xxxxxxxxxxxxx> wrote in message
news:JEuGg.40395$Uq1.896@xxxxxxxxxxxxxxxxxxxxxxxxx
| Rectifier , that is . Scored four 275 amp/600 volt units for a net cost
of
| ten bucks each (shipping included) .
| Got the circuitry and heat sinks figgered out ... but I recall some talk
| in a recent thread about inductors to stabilize the arc . Would I be safe
in
| assuming the unit needs a fairly large (2X2X6 ?) laminated core with a
| winding capable of carrying the max current the welder is rated for ? My
| question is , how many turns is this thing gonna need ? Is field density a
| linear function ? Ten turns ? Thirty ?
| I'm going to build a fullwave bridge , shouldn't really have that much
| ripple . I had some training in electronics a few years ago (a few , he
sez
| ...) and understand the theory of inductive current stabilization . Just
| don't have the math ...

Figuring that a few turns of lead wire around an iron table leg is
enough, I figure that I could take some lead wire or copper tubing and wrap
it through a loop cut out of steel plate would about cover it, but only be
experimentation will that be improved upon. I like to have my stuff
integrated, with components serving multiple functions, so the mounting
structure will serve as a heat sink and inductor core, I'm thinking at this
point.

If these are four stud mount diodes, then, I think, you need three
heatsinks, all of which would carry potential. (not a problem if you
are wrapping isolated wire)

from my old auction for Semikron stud mount diodes:

http://yabe.algebra.com/~ichudov/misc/ebay/SemikronDiodes/-bridge.jpg

Haven't had a chance to get out and actually start on it at this
point. Work has me creatively wiped out and not too inclined to do creative
things once I get home.


ack

.

Relevant Pages

  • Re: Building a bridge ...
    ... I think your polarities are incorrect in url: ... | in a recent thread about inductors to stabilize the arc. ... Figuring that a few turns of lead wire around an iron table leg is ... If these are four stud mount diodes, then, I think, you need three ...
    (sci.engr.joining.welding)
  • Re: Building a bridge ...
    ... | Got the circuitry and heat sinks figgered out ... ... | in a recent thread about inductors to stabilize the arc. ... Figuring that a few turns of lead wire around an iron table leg is ...
    (sci.engr.joining.welding)