Re: MOT Coil operational notes

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Finn Hammer by way of Terry Fritz <twftesla-at-qwest-dot-net>" <f-h-at-c.dk>

Ted,

Having done some work on both MOT supplies and 300 BPS systems I dare
say:

1) There is nothing about a mot that makes it special in terms of
magnetics.

2) You cannot set the electrodes of a 300 BPS SRSG without either a
simulation package, and a scoped primary circuit for fine tuning. Things
get really hysterical with these systems, and their behaviour beats
intuition. At least mine :o)

Am I reading you right, that you have an electrode at -15 deg, top, and
+15 degrees of the incoming voltage waveform? 15 degrees sound awfully
close to me.....0.83 mS

Perhaps you will find it interesting to see the timing that I used on
the Museum coil.

In that setup, the firing af the gaps happens at 2.4mS  6.45mS and
8.85mS

http://home5.inet.tele.dk/f-hammer/tesla/museum/setup/setup.htm

I ran a sim of your primary, and came up with these firing points:

0.2mS  5mS and 7.4mS,

Richie has got some info along these lines:

http://www.richieburnett.co.uk/external.html

but it is getting late so I:

hope this helps, Finn Hammer


Tesla list skriver:
 >
 > Original poster: "tesla by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
<tesla-at-paradise-dot-net.nz>
 >
 > Team
 > A few observations re 6MOT coil FYI and possible comment re excess Vp
 >
 > 88nF/57kHz/6MOT's/Primary ballasting 22mH/6 to 8kVA/300mm x 1200mm toroid/
 >
 > 1) ASRG (up to 3000bps) works but not as well as SRSG  (in terms of spark
 > intensity and length)
 > 2) Safety gap fires furiously with gap at 12mm with SRSG banging at 300bps
 > (Vpk+/- 15deg)
 > 3) 300bps SRSG seems to excite resonance due Cp 88nF and source inductance
 > of MOT psu. Where else is the excess Vp coming from ?? (see 2 above)
 > 4) Even with stress of Vp jumping 12mm (6mm per side) MOT's hold up.(oil
 > baths used)
 > 5) High bps on ASRG drives streamers near vertical. Ground capacitance
 > shunts field at high bps ??
 >
 > Best
 > Ted L in NZ