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Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Yeah, i agree with Dan here, as thats what my pspice analysis of the system showed (and it made sense). Really, i dont bother so much talking about "poles" any more, since i found that you are always exciting both of them to some degree. And since all of my coils seem to prefer different levels of detuning, all i can really say is put a CT on your primary, get out a note book, and start taking down numbers at all sorts of tuning points. Eventually you will begin to see what works well, and what doesnt. Often times the tuning doesnt effect the spark length as much as it effects the primary current. This can be important since you dont want to stress components unnecessarily (thats when you start blowing up MMC caps like me ).
I tend to use charts and graphs like this one for my SISG (could do DRSSTCs too). All that "computer stuff":
The X axis is the primary inductance. It shows that lower primary inductance really raises the primary peak current. So if in doubt, go "up" not "down". Interesting that higher coupling "lowers" the primary RMS current which is significant with the SISG.
Note how the higher coupling suddenly stops helping spark length. The coil crosses over to needing higher BPS (coil power) at that point since the streamer starts starving for power So I need to push higher BPS there (with higher primary RMS current!!). The bump in the arc length center trace at 19uH is probably an upper to lower pole transition.
Of course, all this does not take into acount the coil being thrown into the trunk of the car and the toroid having to be duct(k) taped back together and all But if one sits there in the lab and carefully tunes everything (hours) the math matches reality very well. But all this is usually meant as a "design guide". Once put together, just tune for the biggest sparks )
These days, I tend to use the scopes, current transformers, antennas, etc. to tune the "programs" not the "coils" The programs are so good anymore, I often don't bother to measure since it is just a waiste of time. The programs in many cases predict better than I can actually measure anything anyway
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DRSSTC tuning FAQ
).
So I need to push higher BPS there (with higher primary RMS current!!). The bump in the arc length center trace at 19uH is probably an upper to lower pole transition.
But if one sits there in the lab and carefully tunes everything (hours) the math matches reality very well. But all this is usually meant as a "design guide". Once put together, just tune for the biggest sparks 
)
The programs are so good anymore, I often don't bother to measure since it is just a waiste of time. The programs in many cases predict better than I can actually measure anything anyway 
