DRSSTC Tuning Study (initial data)

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Original poster: <dhmccauley@xxxxxxxxxxxxxxxxxxxxxxxxxx>

I?m presently performing a detailed analysis of 
the tuning characteristics of a DRSSTC 
system.  I?m still in the early phases of this 
particular task, but have come up
with some initial data of Primary Current and DC 
Bus Voltage vs. Arc Length for various tuning points in a DRSSTC system.

This data was collected at 9 separate tuning 
points (1/4 turn increments) on the primary coil 
of a small DRSSTC system.  A strike target was 
placed beginning at 0.25? and increased
in two inch increments up to the maximum arc the 
system was capable of.  For this particular 
system, 32? was the maximum arc, and was limited 
by either the active current limiting
circuit which was set to about 550A and/or 
secondary-to-primary arcing at which time the experiment was ceased.

Natural Frequency of Secondary with 13? x 4? toroid = 198kHz (Measured)
Coupling:  Approx. 0.18 (estimated)

Primary Tuning Range (9.2uH to 5.3uH)
Natural Frequency of Primary Circuit (w/ 0.108uF MMC) (Measured)
9.2uH = 160kHz
7.9uH = 173kHz
7.7uH = 175kHz
7.2uH (I) = 180kHz
7.2uH (II) = 180kHz
6.2uH = 196kHz
5.8uH = 200kHz
5.6uH = 205kHz
5.3uH = 210kHz

Please note, there are two 7.2uH, but they are 
actually ¼ turn from one another.  There was some 
fluctuation do to wire length / positioning of 
the connection wires which attributed to this.
These inductance value were measured exactly how 
the wires would connect to the full-bridge.

Initial Data:

Peak Primary Current vs. Arc Length
<http://www.easternvoltageresearch.com/tuningstudy01.jpg>http://www.easternvoltageresearch.com/tuningstudy01.jpg

DC Bus Voltage vs. Arc Length
<http://www.easternvoltageresearch.com/tuningstudy02.jpg>http://www.easternvoltageresearch.com/tuningstudy02.jpg

Daniel McCauley
<http://www.drsstcbook.com/>http://www.drsstcbook.com


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