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4hv.org :: Forums :: Tesla Coils
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Whitch coupling coefficient is good for DRSSTC?
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BSVi
Thu Jun 04 2009, 06:50AM Print
BSVi Registered Member #1637 Joined: Sat Aug 16 2008, 04:47AM
Location: Kiev, Ukraine
Posts: 83
 		Hi )
I'm going to build new DRSSTC and used Scantesla to calculate optimal parameters:

wrote ...
ScanTesla V-7.62 June 4, 2006 Terry Fritz
Goal = 5.078373e+001 Maximum Leader Length
Cprimary = 0.300000e-006
Lprimary = 1.420000e-005
Rprimary = 1.000000e-002
Coupling = 0.140000
Csecondary = 2.324000e-011
Lsecondary = 1.684410e-001
Rsecondary = 3.850000e+002
Cload = 8.447289e-012
Rload = 2.200000e+005
BPS = 120.000000
Dwell (T1) Time = 2.000000e-004
Ilprimay Maximum = -521.819784
ICprimary RMS (Arms) = 38.979064 ILsecondary RMS (Arms) = 0.424653
VCprimary Maximum = -3477.984486
VCsecondary Maximum = 469105.639486
Coil Power = 323.705880 Primary Bang Energy = 2.697549
Load Power = 239.076104 Load Bang Energy = 1.992301
Leader Length (in) = 50.783734 Streamer
Primary F0 = 77110.821888 Secondary F0 = 80441.130280
Load Energy Rise Time (uSec) = 159.000000

Suggested couping is 0.14. Doesent it seems to be too low? How do you choose coupling?
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HV Enthusiast
Thu Jun 04 2009, 11:08AM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
 		Coupling for DRSSTC is generally about 0.1 to 0.2, however, that will have to be determined during testing and tuning by raising or lowering the secondary with respect to the primary.

My miniBrute design uses a coupling around 0.1.
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teravolt
Fri Jun 05 2009, 12:47AM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
 		Hello BSVi, if your interested Richie Bernett's website hear has a good description of coupling Link2
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BSVi
Fri Jun 05 2009, 02:08PM
BSVi Registered Member #1637 Joined: Sat Aug 16 2008, 04:47AM
Location: Kiev, Ukraine
Posts: 83
 		Dr. GigaVolt, thank you. Now, when I look how does your coil performs, I understand that 0.14 is not bad at all.
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HV Enthusiast
Fri Jun 05 2009, 02:51PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
BSVi wrote ...

Dr. GigaVolt, thank you. Now, when I look how does your coil performs, I understand that 0.14 is not bad at all.

Just keep in mind, that the higher coupling does give better performance, however, you're more likely to have damaging secondary to primary arcing if the coupling is too high.

The secondary on the miniBrute is 4" above the primary coil bottom turn.
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