[TCML] DC Coils

["S&JY" <youngs@xxxxxxxxx>]

Carlos,

 

See below.

 

  _____  

From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of lightningfor@xxxxxxxxxxxxxxxxxxxxxx
Sent: Saturday, January 29, 2011 12:18 AM
To: Tesla Coil Mailing List
Subject: RE: [TCML] DC coils

 

 

Hi Steve, thanks for the info on your system.
Sounds like a solid idea to me...
I am wondering though, about how the change in rotory gap speed effects
the arc length.

At break rates below a few dozen per second, the previous streamer doesn't
have much effect on the next one, and the streamers look wimpy.  As the
break rate gets above 100, the streamers elongate due to residual ionization
and heat effects, and the streamer is more interesting to view.  As you
continue up in break rate, the streamers appear to get thicker and hotter
and much noisier.  Streamers can grow to be 5 times as long as those at low
break rates.  I suppose if you had enough power and had break rates over say
1000 bps, your streamers would behave more like heat arcs, e.g. like a
Jacob's ladder.

In other words, does the charging inductor create a specific speed (BPS)
that works best... Or can you adjust the speed to give different break
rates without the performance being effected too much across the range...?

I just calculated the charging reactance for 400 bps max break rate.
(Higher RSG speeds make me nervous . . .).  The system works fine with any
break rate from 1 to 400 bps with the same charging reactor.  By the way,
surplus treadmill motors work great in variable speed RSGs and are quite
inexpensive.  

My other question relates to my input voltage...
My PSU is only good for 10kvdc.
Do you think this would be ok for a large system... (ive never gone dc
before)

Yes, 10 KV is plenty.  Keep in mind you will end up charging your tank cap
to nearly 20 KV due to the resonant charging.  And keep in mind the power to
your coil is proportional to your RSG break rate.  I usually run my system
below 10 KV from the power supply. For example, to produce six foot
streamers, at 150 bps it took 9.7 KV at 120 mA (1164 watts).  And at 300
bps, it took 7.8 KV at 195 mA (1521 watts).  

Steve Y.

Thanks,

Carlos



_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla