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Author Topic: Muller Dynamo  (Read 4321912 times)

neptune

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Re: Muller Dynamo
« Reply #525 on: May 09, 2011, 07:47:26 PM »
@ Hartiberlin. Anything is worth a try but perhaps you would have problems . As the number of magnets is different to the number of coils , the coils would be out of phase with each other .Some would be "pushing" while some were "pulling" if you understand what i mean . That is my opinion .

k4zep

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Re: Muller Dynamo
« Reply #526 on: May 09, 2011, 07:53:27 PM »
This might be helpfull for those who cannot find the specified DC/DC supply.

Rhino 3000mA DC/DC Car Adapter:  http://www.walmart.com/ip/Rhino-3000mA-DC-DC-Car-Adapter/16318456?findingMethod=rr

Hi Lasersaber,

They also have a 2500 mA (2.5 amp) available for half the price of the 3 amp one!

http://www.walmart.com/ip/Rhino-2500mA-DC-DC-Car-Adapter/16318457?findingMethod=rr

Boy I wish I could build this economically!   Already have over $200 parts on order for my build.  Whew....


Ben K4ZEP

hartiberlin

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Re: Muller Dynamo
« Reply #527 on: May 09, 2011, 08:20:24 PM »
@ Hartiberlin. Anything is worth a try but perhaps you would have problems . As the number of magnets is different to the number of coils , the coils would be out of phase with each other .Some would be "pushing" while some were "pulling" if you understand what i mean . That is my opinion .

Okay, you are right,
this could lead to avoidable problems so some coils might break then the rotation.
So it is best first to try the original setup, you are right !

Sorry.
Regards, Stefan.

yssuraxu_697

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Re: Muller Dynamo
« Reply #528 on: May 09, 2011, 08:25:39 PM »
I found this supplier:
http://www.alibaba.com/product-gs/443365023/power_amorphous_cores.html

"Material:Ni-Zn DN85H DN100H"

Look the specs:
http://www.chinadmegc.com/chinadmegc/chinese/images/bigarea/niexin.pdf

Seems just rather crappy NiZn ferrite :(

Since most ppl seem to be from Europe, and here is hardest to get proper stuff. Maybe try group buy if someone finds right stuff.... ? Of course it would be very messy unless someone organizes it properly...

For example these guys have high-end stuff:
http://www.gammamet.ru/en/ster_sl.htm
But would be pointless to try to order 10 cores :D

Cherryman

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Re: Muller Dynamo
« Reply #529 on: May 09, 2011, 08:30:14 PM »
This one is in the Netherlands and accepts paypal

FERRIETSTAVEN
=============

FAT35    35 x  6.4 mm  Ferrietstaaf                                         0.41
FAT59    59 x  10  mm  Ferrietstaaf, bewikkeld 250 µH
                       //120pF>1MHz  //2n7>130kHz grotere spoelen voorr.    1.14
FAT120  120 x   8  mm  Ferrite (Fairite mix 43)                             3.90
FAT175  175 x  10  mm  Ferrietstaaf                                         5.40
FAT180  180 x  15  mm  Ferrietstaaf                                         6.78
FAT200  200 x  10  mm  Ferrietstaaf                                         4.90

Nog langere staven zijn extreem duur, het verdient daarom aanbeveling ze
samen te stellen uit onze voorraadtypen; dit gaat eenvoudig door verlijmen,
eventueel in combinatie met een kunststof of kartonnen kokertje over de
verbinding.

18x3           Ferrietstaafje                                              0.23

Prices in Euro


Source: http://www.xs4all.nl/~barendh/Indexned.htm

Collapsingfield

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Re: Muller Dynamo
« Reply #530 on: May 09, 2011, 08:32:33 PM »
Just for fun: three similar magnets + two ferrite rods

hartiberlin

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Re: Muller Dynamo
« Reply #531 on: May 09, 2011, 08:43:45 PM »
Many thanks for the flux animation.
I wonder what would happen, if your used
a iron backplate from the upper top stator
magnet to the lower stator magnet to close the
magnetic fields.

Would indeed concentrate much more flux into the airgap
where the rotor magnet goes through.

Also pretty interesting to see, that in the center of the
coil´s ferrite rods there are opposing fields, when the
rotor magnet goes through.

Interesting would be to set it up that the
ferrite rod would then have a reversed flux field.
This would need the stator magnets to be further away from
the ferrite rod cores.

Regards, Stefan.

neptune

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Re: Muller Dynamo
« Reply #532 on: May 09, 2011, 08:46:07 PM »
@Collapsing field .That was a very interesting and relevant simulation . Now can you [or anyone] answer this question . What would ne the effect if the ferrite core was lengthened by [a] 25% and 100% . the reason I ask is that i am trying to find out if the length of the core is critical . The main reason is that some people are anxious to work with materials they have easily available .

bolt

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Re: Muller Dynamo
« Reply #533 on: May 09, 2011, 08:49:23 PM »
SNIP Don Smith

Magnetic permeability is the counterpart of negative
resistance. Resonating with negative magnetic resistance, it pumps energy from the Earth's ambient
background. Magnetic permeability is the ratio of flux density (Earth's B field) to the magnetizing force
(H) in oersteds.
Magnetostrictive materials are piezoelectric in character, and have a very high resistance to electrical
current flow. Examples are:
1. Permealloy Negative Magnetic Permeability
> 80,000
2. Sendust Negative Magnetic Permeability
30,000 -120,000
3. Metglas Negative Magnetic Permeability
> 200,000
4. Iron with ( 34% ) Cobalt Magnetic Permeability 13,000
5. New Technology Magnetic Permeability
> 1,000,000

Look for high Permeability cores Metglass and above. See scope shot taken off coils shows not AC but pulsed Alternating DC with resting time.  This rest period is the ZERO POINT its where the core undergoes negative entropy and put energy into the system. Be interesting to see current at this point i would expect to see current at max when the voltage is at zero point thus for a moment the VSWR is max for a standing wave condition.

neptune

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Re: Muller Dynamo
« Reply #534 on: May 09, 2011, 09:35:38 PM »
@all. I previously asked Romero if he had tried stationary magnets on the coils down below [lower deck] He is likely under too much pressure to answer me . HE MUST HAVE TRIED THIS , AS OTHERWISE , THE LOWER COILS COULD BE DOING LITTLE EXCEPT WASTE ENERGY . Has he discussed this with anyone else please ?

nul-points

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Re: Muller Dynamo
« Reply #535 on: May 09, 2011, 09:36:26 PM »
@Collapsing field .That was a very interesting and relevant simulation . Now can you [or anyone] answer this question . What would ne the effect if the ferrite core was lengthened by [a] 25% and 100% . the reason I ask is that i am trying to find out if the length of the core is critical . The main reason is that some people are anxious to work with materials they have easily available .

good question, neptune
(and good point earlier about the possible 'cancelling' effect of trying the coils in series)

i'm planning to mount my coils 'inside-out' which means that my cores will need to pass right thro' the stator 'decks' (and obviously the stator decks will now need to be close to the rotor) to maintain a short gap between core & rotor-mag

some spare core will be used in passing thro the stator deck, any remaining spare will be at the end where the stator mags are placed, so i'm hoping that i won't need to cut off this excess part of the core, since

 a) it's away from the coil-rotor interaction;
 b) the stator mag adjustment can be used to compensate for the extra 'unused' core at the outer ends

if these assumptions hold, then the the core length becomes less of an issue

it seems like this approach at least gives us another option to dealing with extra core lengths, possibly up to 100% of Romero's

cheers
np


http://docsfreelunch.blogspot.com
 

k4zep

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Re: Muller Dynamo
« Reply #536 on: May 09, 2011, 09:49:29 PM »
@all. I previously asked Romero if he had tried stationary magnets on the coils down below [lower deck] He is likely under too much pressure to answer me . HE MUST HAVE TRIED THIS , AS OTHERWISE , THE LOWER COILS COULD BE DOING LITTLE EXCEPT WASTE ENERGY . Has he discussed this with anyone else please ?

If you will look at all the videos, especially the one where he suspends it, you will see the lower coils do have the bias magnets on them.

Ben K4ZEP

plengo

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Re: Muller Dynamo
« Reply #537 on: May 09, 2011, 09:52:16 PM »
@Romero

Thanks for the inductance.

Can you, pleaae, measure the resistance?

Thanks,

Fausto.

nul-points

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Re: Muller Dynamo
« Reply #538 on: May 09, 2011, 09:53:11 PM »
@all. I previously asked Romero if he had tried stationary magnets on the coils down below [lower deck] He is likely under too much pressure to answer me
[...]

hi again

yes, at 09:38m into the pre-self-running video you can clearly see mags on the lower deck in a low view thro' the side of the rig

hope this helps
np

[EDIT ** apologies for the duplicated answer, Ben - our posts clashed ** ]

http://docsfreelunch.blogspot.com
 

Collapsingfield

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Re: Muller Dynamo
« Reply #539 on: May 09, 2011, 09:57:20 PM »
Other config with stronger rotor magnet.

Best Regards
Collapsingfield