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Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
That video suggests you are running your coil nearly CW, which is not an effective way to get long streamers. You should be running pulses of about 150 to 300uS in length at about 100-500 pps. While those thick yellow arcs are pretty neat, you wont get long ones with only 24V and 7A.
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Thank you very much Steve ofr the useful insight, I scoped the Interruptor and adjusted it to 300uS max on time, and then only adjusted the freq and I was able to get maybe 1" just arcing into the air, and could draw arcs out to maybe 3 or 4"s with just my Power supply, but you think if the voltage was upted to 50VDC it would give 5" or would I need to go more ofr 120-170VDC to actually get the desired arcs? Also the IGBT's get extremely hot with no heatsink and runnig for maybe 4mins not to mention the power supply wires, the cap, and the primary wires all get rather hot, should I reduce or increase the # of turns to reduce this unwanted heat, and would this affect the arc length? Will post a video when youtube finishes uploading.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
You do realize that you have to *tune* the primary circuit, right? You cant just randomly add or take away turns, because that drastically alters the operating frequency, which ideally needs to be fine tuned (like 1/8th turn increments of adjustment) for best output sparks. I suggest using JAVATC or another calculator to determine the ball-park primary tuning point for your given tank capacitor. Try to be accurate when you give your secondary winding parameters.
I think if you work on tuning the system much better, you will see some better results. Id imagine you can get some 5" sparks with 24V input if things are set up right.
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Steve Ward wrote ... I suggest using JAVATC or another calculator to determine the ball-park primary tuning point for your given tank capacitor. Try to be accurate when you give your secondary winding parameters.
I used Tesla map5 It said secondary was 361.52Khz.
Then input 3" primary diameter, with wire size of... .038 I beileve is my wire size and space between wires is .038 also for 10 turns it 9.9uH with the original figure of a 44nF capacitance Fres is 241KHz, so my origianl math was wrong, so I tinkered with capacitance and such tryed the caps in siries and not much inprovement, then i tryed a single cap and I get a nice power out and the Fres comes to 341.025KHz, I get more of a visible arc but still not as impressive, so I removed a turn, not much improvement still, then another still no improvement. Either way heres the video now.
Banned on 3/17/2009. Registered Member #487
Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617
Hmm, You said your primary wire size is .038? Thats kinda small even for a smaller coil. For small coils I use cat5 and parallel all the wires inside and I would guess your tunning is still way off.
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
It was the longest bunch of wire I had around the house. Actually I just remeasured the wire its .048 which is probably stil small, and its probably now my main limmiting factor aside from having a higher surge impedance.
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Troubleshooting DRSSTC
