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help needed for MEG tuning   Message List  
Reply | Forward Message #1304 of 1374 |
Re: help needed for MEG tuning


> I intend on getting back to it, but after I have a better idea what
the real
> issues are with the construct... and I know for a fact, because
Bearden told
> us in his email, that it's not the stength of the permanet magnet,
but the
> core's ability to completely contain the magnet's field that was the
> important realationship... by having the magnet field not project
beyond the
> core the chances of interference by the core's field in the
secondaries was
> reduced... and assisted the construct to a COP greater that one...
the key
> is to get the event horizon. to borrow a term, in the two sides of
the core
> as open as possible to the flow of "energy"... any interference from
errant
> magnetic fields distorts the opening trying to be created in the event
> horizon created by the pulses through the core that the secondries are
> supposed to tap...
>
> Sorry if this is meaningless to you, but I've read so many emails from
> engineers arguing useless warmed over basic electronic shit, when
it's so
> obvious they can't see the big picture.... I just sigh...
>
> Brent Selleck
>

Thank you for your insight on the matter.

As you said, one of the important factor is to get the magnetic field
from the magnet all contained in the core. Which is why (as far as I
know) Metglas core should be better. Because of the huge magnetic
permeability of these kind of core. As a matter of fact, once the
magnet was in the core, I was unable to remove it from there (without
damaging the core)

Still, Having read the book, and a few other things, I still think
that some information is missing/misunderstood. As for myself, if I
knew everything (about the meg ;) I would not be asking for some hints.

I have been told that the magic would be happening when the core start
to saturate. Someone else also pointed me out that my magnet could be
too powerful. I seriously doubt that. The magnet has an area of
967.74mm(square) with a field density (Beta) of 1.3 tesla. The core
saturate at a field density of about 1.4 -1.5 tesla (core complete
saturation at 1.54 tesla) also, the area of the core is
1102.5mm(square).

so, when you have no inputs, the core flux is about 1.3Tesla right in
front of the magnet, but elsewhere, it is more:
(1.3 * (967.74 / 1102.5) ) / 2 = 0.57055 Tesla

*** note, the whole thing is divided by two because the flux separate
between the thow "branches" of the core ***

Anyway, to prove this "partial saturation" thesis, I'll need some
better electronics, becaus mine is burning when the back emf from the
input coils create voltage over 100Volts... (wich is about 30 volts in)

I'll try to get something that works at 500 volts and I'll tell you
how it goes. With that kind of electronics, I'll be able to reach the
optimal +70 Volts that Bearden was talking about.

Ccool









Tue Apr 25, 2006 11:09 pm

ccool_j
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Forward
Message #1304 of 1374 |
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Hello guys, I'm new to this group, but it seems that some of you have some experience with the MEG, so that's why I'm posting here the details of my...
ccool_j
Offline Send Email
Apr 20, 2006
4:49 am

... Have you tried lower pulse width with a deadtime in betwwen? Say something like 2 x 40% with 10% OFF. Mark Jordan...
Mark Jordan
enkitec
Offline Send Email
Apr 20, 2006
4:51 pm

No. Never tried....
Mark Jordan
enkitec
Offline Send Email
Apr 21, 2006
3:46 pm

I have'nt tried either... As far as I know about the meg, what is important is to get fast switching. Faster you go, the better it should be (as said in the ...
ccool_j
Offline Send Email
Apr 26, 2006
12:19 pm

No, because my meg was started as a project with some high school kids last year... we got it built and just started testing and the school year ended. By then...
Brent Selleck
selleck999
Offline Send Email
Apr 22, 2006
4:37 am

... the real ... Bearden told ... but the ... beyond the ... secondaries was ... the key ... the core ... errant ... it's so ... Thank you for your insight on...
ccool_j
Offline Send Email
Apr 26, 2006
12:20 pm

... As the core goes into saturation, the field will be less contained in it, so if good things happen when saturation occurs, it refutes the idea that high...
ey930
Offline Send Email
May 5, 2006
1:54 pm

Hi, it's me again, I have some updates and some graphics. Theses graphics show one of my biggest challenge into understanding and making work the MEG. This...
ccool_j
Offline Send Email
Apr 26, 2006
12:19 pm

In looking at your output waveforms, it appears that your MEG is still a "Biased transformer". Note the skewed output waveform. Try changing the input...
Norm Fletcher
fletchmo47
Offline Send Email
Jun 4, 2006
3:15 pm

You point out one the more interesting aspects to all of this... the ability to measure what's really going on... I sell robotic lawn mowers that use a ...
Brent Selleck
selleck999
Offline Send Email
Apr 26, 2006
7:53 pm

On Sun, 04 Jun 2006 05:56:48 -0000 "Norm Fletcher" <fletchmo47@...> wrote ... I have 2 comments, for which I hope to see a reply: Since the core is...
Wayne Robey
ey930
Offline Send Email
Jun 8, 2006
2:30 pm

... secondary on it's leg. You can see this clearly in old TV fly-back transformers. Could this secondary resonance be what you are tuning for? OK Let me see...
Norm Fletcher
fletchmo47
Offline Send Email
Jul 19, 2006
7:20 pm

Very well said.... and I await your results eagerly... ... From: "Norm Fletcher" <fletchmo47@...> To: <MEG_builders@yahoogroups.com> Sent: Tuesday,...
Brent Selleck
selleck999
Offline Send Email
Jul 21, 2006
3:15 pm
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