Re: [TCML] charging reactors

[DC Cox <resonance@xxxxxxxxxxxx>]

I carry 1 Henry inductors in stock.  Rated at 20 kV 1 Amp.  Vacuum
impregnated with HV silicone.
I use them frequently for Marx Impulse Generators to replace the expensive
HV resistors.  They work excellent to provide
inter-stage separation during the firing phase of the Marx circuit.

Contact me off-list.

D.C. Cox




On Tue, Mar 3, 2009 at 8:35 AM, David Rieben <drieben@xxxxxxxxxxx> wrote:

> Hi Jim H., Jim M.,
>
> I think Jim Mora's idea of using the HV side of a PT or a
> pig and ignoring the LV side would be a good solution to
> this situation. However, IIRC, the original poster of this
> thread was looking for something that could withstand
> 10 to 20 kV AND 1 to 2 amps. So, that would probably
> leave out a PT or a SMALL pig. Maybe the HV side of
> a 15 or 25 KVA, 14,400 volt pig would fit the bill?
>
> David Rieben
>
>
>
> ----- Original Message ----- From: "Jim Harvey (UDN)" <
> harvey.james@xxxxxxxxxxxxxxx>
> To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
> Sent: Tuesday, March 03, 2009 8:25 AM
> Subject: RE: [TCML] charging reactors
>
>
> Has anyone here ever wound their own charging inductor?
>>
>> The laminations, core bobbins, etc., etc., should be readily available.
>> Using an E core would facilitate tearing it apart and starting over if you
>> didn't get the HV insulation just right.
>>
>> My thinking is that winding such a core is less labor that hunting the
>> earth
>> to find one that meets the spec.
>>
>> Just a thought...
>>
>> 73 & Stay Vertical,
>>
>> Jim Harvey (W7YV) - The Great Curmudgeon
>>
>>
>>
>> -----Original Message-----
>> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
>> Behalf
>> Of Jim Mora
>> Sent: Monday, March 02, 2009 11:45 PM
>> To: 'Tesla Coil Mailing List'
>> Subject: RE: [TCML] charging reactors
>>
>> What about a beefy HV transformer secondary say a small pig or PT?
>> Jim Mora
>>
>> -----Original Message-----
>> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
>> Behalf
>> Of bartb
>> Sent: Monday, March 02, 2009 6:58 PM
>> To: Tesla Coil Mailing List
>> Subject: Re: [TCML] charging reactors
>>
>> Good points Ed.
>>
>> You know, I've been a crappy guitar player since I was 5. With that
>> experience, I couldn't help but look at Hammond Manufacturing when Jim
>> mentioned the "charging inductor" (many good tube amps use Hammond RF
>> Transformers). Hammond does build a 5H 500mA choke which would suffice for
>> this application if it were not for the high voltage. Voltage is a big
>> problem here with the charging inductor. In order to create the voltage
>> winding standoff, the insulation thickness becomes a burden on winding a
>> 5H
>> inductor. Even the 5H 500mA choke Hammond produces (193P) is about the
>> size
>> of a hefty MOT, and it's rated at only 800V. It's not an easy assignment
>> as
>> stated earlier. Digikey offers the 193P at $170. I can't imagine what a 10
>> to 20kV version would run if there were such a beast.
>>
>> Regards,
>> Bart
>>
>>
>>
>> Ed Phillips wrote:
>>
>>> 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 copper.
>>>
>>> Good luck,
>>> Ed
>>>
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