[TCML] charging reactors
jimlux at earthlink.net
Mon Mar 2 07:31:48 MST 2009
Ed Phillips wrote:
> jimlux wrote:
>> Ed Phillips wrote:
>>> So, if one needed to build or buy a dozen charging inductors for a
>>> resonant charged spark gap coil, where would one look..
>>> It's for an application where there's multiple coils being charged
>>> from a common HV DC bus.
>>> Probably need 5-10 H, and it needs to handle a few hundred mA to amp
>>> (e.g. 10kW @ 10kV is an amp), and, of course, have a 10-20kV voltage
>>> That's a mighty big assignment! Those things will be expensive if
>>> you can find them at all.................
>> Well.. I've seen some websites with TCs where folks wound several
>> hundred turns of wire on a Ferrite U core of some sort or another. I
>> suppose one could find the bare cores for MOT's for instance. (or a
>> cheap source for the transformers new, and just saw off the windings
>> you don't need..)
>> Just casting about for ideas.. And expensive is a relative term....
>> $50 each wouldn't be unreasonable.
> I hate to be negative but you're talking about really serious chokes
> here and nothing you can do with "several hundred turns on a U core".
> You want a lot of inductance with a lot of DC flowing through the coil
> and that's something you're not going to get by casual experimentation.
> I would guess you'd need a high-quality transformer iron core with cross
> section of at least 4 square inches, a fairly large air gap, and lots of
> wire with special attention to insulation. You can probably find power
> inductor design information on the web if you hunt around. If you can
> find something meeting your qualifications for $50 that would be a super
> bargain! I'm looking at a 1958 Stancor catalog and see that a 6 henry,
> 500 ma choke has a base size of 5-5/8" x 5-1/2" and is 8-1/8" high.
> Shipping weight is 24 pounds and list price 50 years ago was $54.00. A
> 10 henry, 1 amp choke from UTC is 4-3/4" x 6-7/8" x 10-1/2" and weighs
> 40 pounds. Net price was $40 half a century ago! Neither of these
> transformers is designed for high pulse voltage across the windings and
> that would of necessity require more insulation with more iron and more
I was expecting physically large and heavy.. And at least you've given
me some ballpark numbers..
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