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Re: [TCML] 5.25" SRSG tesla coil suggestions on improving performance
The coil runs best at 2.25 turns. It was originally at about 5-6 turns, but that's when I had a 69nf cap. I have since increased the cap to 180nf.
Would too much current cause poor performance?
Thanks,
JJ
________________________________
From: w5als <w5als@xxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Tuesday, August 6, 2013 7:59 AM
Subject: Re: [TCML] 5.25" SRSG tesla coil suggestions on improving performance
Hi
First I am no expert at this, with that said looking at your
pictures the tuning does not look to be right at 2.25 turns
and I would think that MOT's would have to be ballasted to keep the
current down. I have never use mot's before
and may be totally wrong here. I hope some one else put there input in
on this. I did not crunch the number on
this for the tuning neither, I may be wrong but I think that may be a
problem to.
alton
On 8/5/2013 8:59 PM, JJ Dasher wrote:
> Hi all,
> I'm new here. Although I've built a few coils in my past, I still consider myself a newb coiler. I've never been the type to do things mathematically perfect, and tend to wing it as I go along, which may be my downfall here. For the past couple of years on and off, I've been working on a 5.25" SRSG coil to use in a Halloween display. This is my largest coil so far. You can see it in action here:
>
> http://www.youtube.com/watch?v=2P3T5zuT9DI
>
>
> and pictures of the guts here:
>
> http://imgur.com/a/0jgxR
>
>
>
> I'd like to get some constructive criticism and advice on getting this running better. This trips my 20amp breaker after about 10-15 seconds of running, so I figure about 2.2-2.6kw? I'm currently getting 36" streamers, which I feel are somewhat weak. They are purple, and not very bright.
> Specs:
>
> Large old powerstat variac salvaged from power equipment. Not sure on exact specs, but I assume it should handle 30+amps with ease. Wired for approx 150v boost.
>
> Dual MOT's (pulled from 1200w commercial MWs), currently unballasted. 130uf of PFC caps behind them.
> 180nf MMC cap built with 10 strings of 8x 942c20p15k-f's. 1m bleed resistors installed.
> SRSG is a 5" acrylic disc attached to a 1800rpm sync motor. 4 flying electrodes for 120bps. Electrodes are 1/8" thoriated tungsten. Phase is adjusted by twisting the motor in its mounts.
> Primary is 3/8 copper tubing, slightly conical. Currently tuned at about 2.25" turns
> Secondary is 5.25" x 24" 22awg magnet wire with a couple of coats of poly.
> Topload is a spun aluminum 4.5"x18" toroid.
> All high current busses are 4awg stranded copper with large soldered lugs.
>
> The next improvement I plan is to upgrade to 1/4" tungsten electrodes. The stationary electrodes currently glow red hot after about 5 seconds of running, so I added a fan.
> I'd love to get some bright long white snakes like I've seen from similar size coils. Please advise!
>
> Thanks!
> JJ
>
> P.S. There is normally a safety gap installed, It just wasn't in place when I took those pictures.
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
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