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Re: Sync vs. async - was Re: [TCML] 3 phase sync.



Higher break rates don't equate into longer discharge lengths. Given that
the primary circuit isn't swamping out the transformer (saturating) a
higher BPS results in simply more bangs per second from the secondary, ie;
transfer of greater energy OVER TIME.

In my 'medium-size' coil system, I have 0.6uF and originally ran at
120BPS. Got 6 foot discharges that nicely wandered around. I upped the BPS
to 240 and the discharges did not increase in length, but became FAR more
energetic.

Most recently, a gap re-design produced 600BPS(!). Of course the power
draw (or suck??) went up, but the discharges, though still only about 6
feet in length, are FAT, NOISY and HOT. White-hot! And my transformer is
only 1:100 ratio, meaning 12Kv output voltage.

If we step back and think about it for a moment, that's why Tesla had such
a high BPS in the Magnifying Transmitter - High Cp and low Hp equals FAST
field build and collapse which couples a lot more energy, which makes
sense as the 'secondary' was merely a high-current signal source for the
extra coil.

It's also important to note that the gap dwell time plays a BIG role in
energy transfer as well. Long dwell in low Z systems is detrimental due to
a portion of the magnetic field being lost BACK through the gap. Ideally,
dwell is such that the gap duration *JUST* cuts off when the resonant rise
in the secondary peaks. Since my system has only 4 turns in the primary,
and approximately 240 turns in the secondary, it is a relatively high Q,
low Z system. So a short gap time and high BPS then allow a helluva lot of
energy to be coupled to the secondary.

Crude math approximation revealed approximately 18 joules(!) of peak
discharge energy occurring at 600 times per second. Given the uS rate of
secondary discharge duration, that worked out to something like 18MW(!) of
peak secondary impulse energy. (And I sit on top of THAT...)

No wonder Tesla was able to coax 100+ foot discharges off the top of the
'Transmitter'. (Also no wonder why if I'm not careful, a power-arc will
literally throw me off the table.)

- brent



> David
>
>  This coil has run sync. from day one which was 1999.  At first I tried
> 240
> BPS, but power consumption was huge and only got 14 foot sparks. I went to
> 120 BPS and its been happy every since.  The cap is .173 uF Maxwell (two
> .346 uF in series) since the beginning also.  It would probably run ok at
> higher break rate with smaller cap. but its proven to be very reliable in
> its present configuration which is what I want. Looking at an upgraded
> toroid this summer though.
>
> Kevin E.
>
> On Tue, Feb 7, 2012 at 10:32 AM, drieben <drieben@xxxxxxx> wrote:
>
>> Hi Kevin,
>>
>>  From looking at the more recent videos of
>>>
>> your magnificent super sized coil, it appears
>> (sounds) that you have been running sync for a while. I was just
>> wondering, wasn't the Biggg
>> coil originally running async? And if so, when did you change over to
>> sync
>> and when going
>> sync, did you keep the same sized original pri-
>> mary tank C? Seems like your original primary C was ~ .176 uFd? I've
>> come
>> to realize that most high powered SG coil systems get by with a
>> relative-
>> ly small tank C because of the higher-than-mains-
>> frequency break rate often emplyed in async rotory SG systems that
>> allows
>> more shots per second, at a given voltage. It would appear that to keep
>> a
>> comparable power throughput, one would have to resort to a
>> proportionately
>> larger tank C,
>> or increase the voltage, when cutting the break rate from the several
>> hundred bps usually employed in async
>> driven systems to the 120 bps that would run sync to a 60 hz mains.?
>>
>> David Rieben
>>
>>
>>
>> ----- Original Message ----- From: "Kevin Eldredge" <
>> oklahomacoiler@xxxxxxxxx>
>> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
>> Sent: Monday, February 06, 2012 8:42 PM
>> Subject: [Bulk] Re: [TCML] 3 phase sync.
>>
>>
>>  Thanks all for the responses.  I was thinking of modifying my 7 1/2 HP
>>> dynamic 3 phase converter to sync. and replace my
>>> Biggg Tesla coils single phase sync. gap motor with a 3 HP sync. 3
>>> phase
>>> motor. Just an idea.
>>>
>>> Kevin E.
>>>
>>>
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>


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