Re: Current Limiting and Impedence

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Paul B. Brodie" <pbbrodie@xxxxxxxxxxxxx>

Claude,
Can you provide some more information about your ballast? What gauge wire 
and how many turns? How long is the actual winding? I mean, does the wire 
cover the entire 12" length of pipe or is the winding shorter and if so, 
how long? Are the filler rods cut to 12" length or do they stick out the 
ends of the pipe? What type of transformer are you ballasting and at what 
voltage? I appreciate any additional information. Regards.
Paul
Think Positive
----- Original Message -----
From: "Tesla list" <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
To: <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
Sent: Thursday, May 12, 2005 10:33 PM
Subject: Re: Current Limiting and Impedence

> Original poster: "claudio masetto" 
<<mailto:claudmas@xxxxxxxxxxxxxxx>claudmas@xxxxxxxxxxxxxxx>
>
> Paul,
> I've made a ballast from 1/8" mild steel filler rods. I cut a 12" length of
> 60 mm pvc pipe and bunched enough rods together to fit inside. The rods
> were not varnished together but bundled together and dipped in varnish and
> baked. By sliding the core in the coil I can vary the current limiting. It
> works great, doesn't get real warm, although I only do short runs.
>
> Claude.
> ----- Original Message ----- From: "Tesla list" 
<<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
> To: <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
> Sent: Friday, May 13, 2005 6:43 AM
> Subject: Re: Current Limiting and Impedence
>
>
>>Original poster: "Paul B. Brodie" 
<<mailto:pbbrodie@xxxxxxxxxxxxx>pbbrodie@xxxxxxxxxxxxx>
>>
>>Malcolm,
>>What about non-magnetic stainless steel welding rods in 1/16" diameter? Is
>>there some other reason not to use stainless steel? They are a lot more
>>expensive than mild steel but they are also non-magnetic or do they need
>>to be at least some magnetic? Thanks.
>>Paul
>>Think Positive
>>
>>----- Original Message -----
>>From: "Tesla list" 
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>>To: 
<<<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
>>Sent: Thursday, May 12, 2005 12:27 PM
>>Subject: Re: Current Limiting and Impedence
>>
>> > Original poster: "Gerald  Reynolds"
>><<<mailto:gerryreynolds@xxxxxxxxxxxxx>gerryreynolds@xxxxxxxxxxxxx>mailto:gerryreynolds@xxxxxxxxxxxxx>gerryreynolds@xxxxxxxxxxxxx>
>> >
>> > Hi Malcolm,
>> >
>> > Where can you get Silicon steel?? Do they make welding rods out of this
>> > stuff or is there another alloy that would work?? and what diameter rod
>> > should we be looking for??
>> >
>> > Gerry R.
>> >
>> >
>> >>Original poster: "Malcolm Watts"
>><<<mailto:m.j.watts@xxxxxxxxxxxx>m.j.watts@xxxxxxxxxxxx>mailto:m.j.watts@xxxxxxxxxxxx>m.j.watts@xxxxxxxxxxxx>
>> >>
>> >>Hi Paul,
>> >>           Whatever rods you purchase for the core, they have to have
>> >>a very small x-sectional area. They should also not retain much if
>> >>any magnetism after being de-energized (check with a magnet) or they
>> >>will have large hysteresis losses resulting in lots of heating.
>> >>Silicon steel such as used in transformer cores is preferred if you
>> >>can get them.
>> >>
>> >>Malcolm
>> >
>> >
>> >
>> >
>>
>>
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