Muller Dynamo

[nul-points]

I am trying to get a team together to replicate this . One problem with replication can be , do you try to exactly copy  the working example or do you use materials to hand to save money . I plan to compromise by building a good shaft and rotor and then experimenting with the other bits .
           Here is an important question . What is the orientation of the magnets on top of the coils? If we assume that all rotor magnets are north pole up , are the magnets on top of the coils north pole up or south pole up . Also I need to learn more about Hall effect switches .Obviously , the motor drive coil needs to be energised as a magnet approaches it , and switched off as the magnet comes to its closest point to the coil . I am not quite clear at the moment what causes it to switch off at this point .

hi Neptune

sounds like a good approach

this is the first time that i've been seriously tempted to build a motor, rather than a solid-state device

wrt the static mags, since their purpose is to 'null' the attraction between rotor mags & coil cores, then it seems likely that the upper mags are opposing the rotor mag orientation - does that seem sensible?

i think i noticed that Romero has what appear to be steel washers (glued?) to the upper frame above the coil positions, so that the upper mags hold themselves in place but can be moved easily (neat?)

when you get a larger one of these powering your bike i'm going to get on a train and come up to Lincolnshire and cheer you on! 


hope this helps (...er, i don't mean the cheering bit)
np


http://docsfreelunch.blogspot.com

[romerouk]

Hi folks, well I'm working on a replication, though I will be using 5/16" diameter steel bolts with 24 gauge wire, had 6 already made from previous project, just need to make 4 more and am using 6 - 1" diameter neo magnets on 3/4" mdf rotor, 6" center to center of magnets.
Will be using 10 coils total or 5 per side.
Will use hall effect with TIP42. Will start with one coil pair drive.
Will use same 1" diameter neo magnets at back of coil/cores to reduce drag.

I've built similar setups previously, so this will be no problem, just have some drilling and coiling to do yet.
peace love light
tyson

I am not sure about the steel bolts, I tried in my first attempts with steel screw and that was a total failure.If you insist using it make sure u have enough gap betwen the coil and the rotor.
5 coils each side  might not be enough because you'll have a big distance betwen the coils that can affect the system. I have never tried it like that but in the end we will learn from all this.
Ultra important is to have the magnets spaced equally and the coils too.Failing in this arangement will cause system not to work properly. Leave the hall sensor to the ned to be able to find the right position and do it separately for each coil, not having both powered.
Initial tests must start with a load connected, at least a 5w but 10w will be better.
Don't connect all rectifiers togheter from the beginning, test and do the magnets adjustments individually.

I wish you luck.

PS: I already have a lot of offers to sell my device:) I have no intention to do that.
First I need to replicate myself then we shall see. I need to be able to do it again but this time at a bigger scale.
I have another small device in testing, a bit different than this one but I might get some extra output if it is going to confirm my thoughts but not yet.
I have most of the parts for the new build but not the rotor and bigger magnets.The magnets I am going to order today but the rotor is a pain.
I am not sure if building the coils as Bill suggested is of any advantage, that must be tested before comparing with a standard coil.

[neptune]

Hi Nul-points . I would agree that your theory on the coil-top magnets sounds most likely .But it would be nice to hear cofirmation from the man . I am still wondering about using old ferrite rod from old radios as cores ,because I have some . I know not all ferrites are equal .Based on a rotor speed of 5000RPM and 9 coils ,AC frequency in the coils would be about 45 Khz ., a much lower frequency than the ferrite sees in the radio .Criticism of this theory invited .
        For a pensioner like me ,Neo magnets are expensive , so I face 3 choices
1. choose the exact magnets Romerouk uses
2. Choose larger Neos in the hope of building a bigger machine .
3.Experiment initially with ceramic magnets from microwave ovens , which I have already.
Again criticism welcome .
@Romerouk . What is your longest looped run to date please?

[SkyWatcher123]

Hi romerouk, thanks for the tips and info.
I've built Muller odd/even setups like this in the past, though It may in the end need ferrite cores or equivalent to prevent all the losses.
At least I'll have it all setup to use ferrite, etc. later on.
I'm going to use a separate timing rotor that has smaller ferrite magnets, that way I can easily adjust the hall sensors using that.
peace love light
tyson

[nul-points]

PS: I already have a lot of offers to sell my device:) I have no intention to do that.
First I need to replicate myself then we shall see.

hi Romero

your achievement** here could be a 'tipping point' for the future direction of small-scale to medium-scale energy supply

if that becomes true, then that prototype could well become a part of history - i'd either hang on to it, or donate it to a museum at some point

it's not that a particular device is the key thing here - it's just showing the world that this is a feasible means of using energy


** i know that you've followed on from Bill Muller's lead here, but your system may be the step which moves everything forward

good luck for the future
np


http://docsfreelunch.blogspot.com