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Re: Arc Welders as Rheostats?? Variac Mod Question
Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>" <davep-at-quik-dot-com>
Tesla list wrote:
> Original poster: "Jack King by way of Terry Fritz
> Anyone out there have data on how "wide" the air gap needs to be?
Near as thin as you like.
>My gut says something like .75-1"
I Took a course in mag design, once, decades ago.
'any' air gap is as effective as a huge one.
(roughly speaking. There is math, could be found in
any engineering handbook. But the above captures the
> should be sufficient to interrupt the flux travel...any
Thoughts don't count. 8)>>
This is physics. Known physics. 8)>>
> I'm toying with "modifying" a 7.8 kva unit for use as a series reactive
> ballast, and would like additional insight before i dig out the band
Cut a thin slot. Easier to widen it if more is needed.
(it won't be....)
> Also, does one need to replace the removed section with epoxy or something
> along those lines to maintain structural integrity?
I'd think not. Could do, but I wouldn't.
(If someone asks, I'll try to dig out the maths. But.
'trust me', an arbitrarily narrow slot is fine...)