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Author Topic: Muller Dynamo  (Read 4321933 times)

Cherryman

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Re: Muller Dynamo
« Reply #465 on: May 09, 2011, 09:47:09 AM »
I believe someone said they were having trouble finding the DC-DC converter.  this one is 3 amp and while it has the name 'Vanson'  it looks the same and is on sale from Maplin for Euro buyers: Universal 3A DC Power Supply Was £21.99 Save £9.00 only £12.99
On promotion until 17/05/2011   here:
http://www.maplin.co.uk/universal-3a-dc-power-supply-228639

This website has a few options:

http://www.voltcraft.nl/notebook-netvoedingen#auto

nul-points

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Re: Muller Dynamo
« Reply #466 on: May 09, 2011, 09:47:30 AM »
Hi Romero.

I've noticed from the schematic of your circuit that you are not directly taking advantage of the collapsing magnetic field of your drive coils when thay are in off mode.
[...]
I am very curious to know how this slight addition will affect your setup. Thanks in advance if you choose to experiment and report on the result.

Understanding, if not.

Cheers from Hoptoad ..... KneeDeep

hi Hoptoad

if Romero hasn't already tried this but doesn't wish to, i'm intending to include feedback of coil-collapse energy in my build attempt, although in my case i'm planning to feedback to the buffer cap - so you should get a report back from someone  :)

cheers
np

http://docsfreelunch.blogspot.com
 

e2matrix

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Re: Muller Dynamo
« Reply #467 on: May 09, 2011, 09:50:04 AM »
Either you are replicating OR you are up-scaling and using bigger better coils and magnets. In which case get the best Schottky diodes you can afford. Excess amps now wont go a miss later. With 10A diodes in a bridge you got like an easy 50w per coil with 10 very large generator coils collectively 500w system.

Is this what you are building? :)

Also one other point. Once you built this some of you will want to use coil shorting to give an extreme boost of power and volts. You get 300-400v when the coil is shorted. If you plan on doing this you need like 500v diodes. At 350v and 0.5 amp you now have 175 watt per coil = 1.7Kw system. No its not too far fetched the wind power guys make these muller style systems at that power rating.

bolt, hoptoad and nul-points,  Thanks all for your help!  I was not clear on the threshold rating but knew high amp regular diodes have bigger losses.  Now I've got a much better picture and it sounds like going for a higher rating is the best idea especially if I end up scaling up.  Not real sure what I'm doing at this time but will be happy with any OU replication and go from there.  I tend to have an open design philosophy that  develops itself with the ebb and flow of ideas and play $$ available :) 

toranarod

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Re: Muller Dynamo
« Reply #468 on: May 09, 2011, 09:54:35 AM »
while we are on the subject of coils
I have a come up with this. here is a 15 mm litz wire coil on a ferrite former.
what is the inductance of the coils in RomeroUK motor? any body have even a close idea?

has any body wound a coil?


bolt

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Re: Muller Dynamo
« Reply #469 on: May 09, 2011, 09:56:20 AM »
This website has a few options:

http://www.voltcraft.nl/notebook-netvoedingen#auto

Look on ebay for universal 12v car adaptor they are sold from China all over the world!

 Its just a switch mode PSU just pick one with a voltage selector and good wattage.

toranarod

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Re: Muller Dynamo
« Reply #470 on: May 09, 2011, 09:58:54 AM »
Romerouk what are the diameter of you coils when wound?
I have been winding coils they seem larger than the one is your photo?


bolt

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Re: Muller Dynamo
« Reply #471 on: May 09, 2011, 10:05:15 AM »
He said he is not answering any more questions that already been answered. The only new questions is the inductance value and the resistance to be answered later when he gets time. Everything else is in the thread.

Guys you must realise no one is going to get the same bits all over the world. Just build it with what you have available its no different to making a joule thief and everyone of those is different and most of them work. Everyone is going to wind coils a bit different with different cores. So long as the re-gauging back end neo is carefully tuned it should work.

toranarod

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Re: Muller Dynamo
« Reply #472 on: May 09, 2011, 10:09:35 AM »
He said he is not answering any more questions that already been answered. The only new questions is the inductance value and the resistance to be answered later when he gets time. Everything else is in the thread.

Guys you must realise no one is going to get the same bits all over the world. Just build it with what you have available its no different to making a joule thief and everyone of those is different and most of them work. Everyone is going to wind coils a bit different with different cores. So long as the re-gauging back end neo is carefully tuned it should work.

OK you go a point
I will go with what i have built.

I will let you know what the inductance is very soon.


yssuraxu_697

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Re: Muller Dynamo
« Reply #473 on: May 09, 2011, 10:13:58 AM »
I have a come up with this. here is a 15 mm litz wire coil on a ferrite former.

Ferrite discs on both sides of the former will act as shields to external magnetic fields parallel to axis.

sigis

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Re: Muller Dynamo
« Reply #474 on: May 09, 2011, 10:18:41 AM »
Ferrite discs on both sides of the former will act as shields to external magnetic fields parallel to axis.
Hi there is nice pictures!
What computer program you are used to get it?
Thanks!

yssuraxu_697

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Re: Muller Dynamo
« Reply #475 on: May 09, 2011, 10:23:23 AM »
Hi there is nice pictures!
What computer program you are used to get it?

Hehe, nice - not :D useful - yes. It is ViziMag. Good tool for 1-minute concept checks - very easy to use.

khabe

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Re: Muller Dynamo
« Reply #476 on: May 09, 2011, 10:24:24 AM »
Ferrite discs on both sides of the former will act as shields to external magnetic fields parallel to axis.

Glad to see that there is at least one person understanding about magnetism ;)

But there is second magnet on the top side, you need to reckon with as well,

When someone speaks about saturation then ... look at huge air gap between coil and  10...12 mm thick magnet - about what kind of saturation we are speaking? ::)

cheers,
khabe

hoptoad

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Re: Muller Dynamo
« Reply #477 on: May 09, 2011, 10:36:08 AM »

snip ... these is no battery in the circuit so why bother charging a battery?

snip...

Charging the battery is an incidental bonus. The circuit as shown produces a unidirectional current through the coils from their own collapsing field which extends the duration of the applied power pulse within them.

Provided the duration of the extended pulse does not exceed 50 % duty cycle, this will cause an increase in rotor speed and torque, thus giving rise to the expectation of an even greater gen coil output.

If the drive coils are very low impedance, the battery does not need to be in the feedback circuit, and the diodes can connect directly to the positive rail, resulting in a beneficial effect on rotor torque.

If, however the coils have too much impedance, the battery's capacitance properties, in the feedback collector circuit, ensures that the timing constant of the whole feedback circuit is low, and wont cause the extended applied power (as opposed to supplied) to the coils to exceed 50 % duty cycle.

Impedance and duty cycle play a great role in whether the feedback circuit is a benefit or a constraint to rotor torque and speed.

Cheers

hoptoad

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Re: Muller Dynamo
« Reply #478 on: May 09, 2011, 10:38:09 AM »
hi Hoptoad

if Romero hasn't already tried this but doesn't wish to, i'm intending to include feedback of coil-collapse energy in my build attempt, although in my case i'm planning to feedback to the buffer cap - so you should get a report back from someone  :)

cheers
np

http://docsfreelunch.blogspot.com

Great.  Curious as always.   :)

Cheers

yssuraxu_697

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Re: Muller Dynamo
« Reply #479 on: May 09, 2011, 10:52:04 AM »
But there is second magnet on the top side, you need to reckon with as well,

And that magnet is actually somewhat shielded by metal washer. Rendered sketch to show entire picture as I understand it.

about what kind of saturation we are speaking?

Eventually would be nice to make airgap smaller. I'm not going for exact replica, so my mistake - was thinking rather of my own project.

PS. Besides washer there are eddys running around in the magnets coatings, which are btw highly conductive :) It almost seems like conspiracy, strongest magnets are provided with conducting coating to degrade their performance in dynamic systems :D