Muller Dynamo

[nul-points]

[...]
Now for the ferrite mags on top of the NEO cores why are there two on some and a thicker neo with a single ferrite mag on another does this play a role in everything as well?
[...]

the ferrite mags were a late addition (after the self-run video)

Romero reported that he'd tried various things like - larger coil/cores - plastic spacers - extra mags (ferrite) on the stator mags & they all made an improvement

i think you should consider the actual number of mags on any core position to be a matter of tuning

HTH

====

hi chrisC

nice mechs!

i'm glad to see someone else going for a tripod strut scheme - that's my plan also

my nylon studding arrived today & seems rather too flexible for long sections, but i'm hoping that my close stator/rotor arrangement will still be stable!

cheers

[nul-points]

[...]
One coil fires at a time doesn't it. So on any given pulse, or can I say standard generated sine wave, from a magnet passing a coil comes from one individual coil at a time not the sum of all the coils. Does the frequency of generated pulses go from 9 to 72 or 90? when you change configurations?
[...]
John H (DadHav)

John

thanks for the background on the coil/mag design

i think you're right when it comes to individual coil positions

the situation may change with some kind of circular interaction around the whole assembly but we have little real data to go on yet

Romero gave us but one (ungraduated) trace of a single coil o/p (pre FWBR)

a few guys now have got as far as showing us hard data from single coil pairs - it's 'possible' that aspects of Romero's config may cause the coil o/p to deviate from a cleaner 'sine' profile

but we've still yet to see how the combined o/p looks and whether anything 'funky' happens when you fire up this kind of beast on all cylinders
(LOL - i know that going overunity IS funky - but i mean whether the TOTAL coil/mag behaviour can no longer be completely extrapolated from conventional behaviour)

i picture the o/p as a kind of 'poly-phase' generator type waveform, approaching DC in its average level - each gen coil 'firing' in turn as you say, and overlapping with the o/p from its adjacent coils

not sure if this goes any way to answering your question but i know we're all really glad to have someone with your solid experience of motor builds involved

thanks
np

http://docsfreelunch.blogspot.com

[chrisC]

Hey chrisC,

that's a beautiful work. If costed you so little, would you share your sources? Just my 2 sheets of acrylic cost about $65. The magnets were very expensive, around $200. The bearings I agree that using a old VCR is excellent, which I've done in the past and it is free.

If you would be even willing to get me a perfect copy of yours for me I will pay you for that. Let me know please.

Fausto.

@plengo

The rotor plate is 8" and the stator plates 11". From Tab Plastics. These are precut circular acrylic plates used for wedding cakes tiers and that's why they are much cheaper. see: http://www.tapplastics.com/shop/product.php?pid=140&PHPSESSID=20110517203131322248093

I had to drill the tripod holes as they are not critical but took 4 hours; all I had to do is to make sure it's close to 120 degrees. The 8 magnet holes on the rotor are cut by Tab plastics from the stencil someone generated right at the beginning of the thread. Those holes cost $30, I think. It's NOT CNC and they have 1/8 or 1/16 tolerances(?)

Magnets I've ordered from http://www.magnets4less.com.
30 Neodymium Magnets Disc 3/4 in x 1/4 in Strong N42 (ND045-1) - $46.50
7 Neodymium Magnets 3/4 in x 3/8 in Rare Earth Disc (ND046) -       $20.23
Shipping                                                                                     $12.18

Hope that helps. Tab Plastics will do online orders and you can give them all your requirements (assuming you're in the U.S).

cheers
chrisC

[Magluvin]

Hello Guy's Listen if you think there is anything new about the coil / magnet combination of these generators you're probably wrong. People have been computing results of different combinations for years. Here is a calculator that proves the point.
http://www.powercroco.de/bewicklungsrechner.html
I have been using calculators like this one since I've been building motors. If you put in the 9 coil 8 pole combination you will see 72 for the cogging points, and 90 if you use 10 magnets. There's something that bothers me so I'd appreciate input. If the poles where even. 9 coils 9 magnets and the coils are in parallel right? So all coils would fire at one time. We all know coils, capacitors and batteries in parallel give or accept more current right? So this (The Romero Build) is not like a normal parallel coil set up. One coil fires at a time doesn't it. So on any given pulse, or can I say standard generated sine wave, from a magnet passing a coil comes from one individual coil at a time not the sum of all the coils. Does the frequency of generated pulses go from 9 to 72 or 90? when you change configurations? Even if it does don't you still have only one coil at a time delivering potential? It's really possible I have no idea what I'm talking about but I'd like to know before I think about it any further. I'll probably still be thinking when everyone is fighting off the Bad Guys because they have OU.
John H (DadHav)

Hey Dadhav

If 2 coil sets are used for motor then there are only 7 sets left for the gen side. 7x8=56 coil pulses per rotation.

I know, it seems like, eh, can it do it.  Dunno.  But if there is a function, unseen or not imagined, as to what, yet, then we cannot assume as experimenters or testers till we have it on the table. =[

I had this even/odd thing in a magnet motor idea, but never thought of it for a gen. 

Mags

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