Muller Dynamo

[yssuraxu_697]

I have personally not been able to fit more than around 250 turns of 0.375mm wire on such a sewing bobbin without the wire falling off.

Single strand? Multistranded wire will deform when winding and make a bit more solid winding plus romerouk has "overfilled" the bobbin plus these 300 turns were likely wild guess.

My 2 cents how the wire mess started. Maybe it has been told but anyway. It is easy to confuse wire diam and area in this case. If you take 0.125mm2 for area then 7x0.125mm2=0.875mm2 total area which btw makes ~0.8mm diameter. That's the closest match in the table so it is easy to confuse.

What I'm not so sure of is using bobbin at all. Certainly it makes job easier but it will keep inner windings somewhat away from the core. 6mm diam core is a joke anyway. rom reported that had better results with larger core. In my experiments I also recently moved from tiny ferrite cores to oversized ones and results got better.

Also pay attention to ferrite material electrical resistance, "cat in the bag" core would not do, you need to know exact material specs. Some types are not much better than using bolts or laminations. And that is dead end.

[khabe]

At that when to look closely this wire and to try compare sizes in proportion, then it looks like not 0.125mm wire but somewhere twice thicker and there are not seven strands, looks like two or three
OK, this is not what does get me back up because anyway it does not matter
Theere is one thing what does matter very much ... you have to be very careful with spinning your rotors - do not try  all together at the same time - earth axis could be shifted away, this is clear and present danger for existence of human race
cheers,
khabe

PS:
I took covertly one sewing machine bobbin from box where my wife keeps this kind of stuff and tried to wind this bobbin with 0.5 mm wire as correct as possible without glasses  - result was 150 turns, wire lenght somewhat five meters 

Perhaps he wound two strands by 150 turns and then these strands connected like "bifilar" need to be done (one end with other start) ... summary 300 turns

[nul-points]

Here is interesting replication
http://www.youtube.com/watch?v=KdxMbCU7O8c

This is a good replication, once he installs more power pick up coils, I believe he will be able to close the loop.

i believe that he already has closed the loop, feeding back the generator output to a 52000uF buffer capacitor

look at his initial on-screen comment,  "this is my first run and observe with care what happens"

halfway thro' he disconnects the battery, the rotor starts to decrease revs

however, it appears to me that it starts to approach a new lower rpm

unfortunately he then stops the video, so we don't get to see if it just continued running or if it was just slowly discharging his 52000uF buffer cap

the DVM that was in the camera shot appeared to be on the 200 volt range, and showed that he was able to generate 42V+, which is pretty impressive

he has a very smooth bearing & rotor assembly which enables him to get very high rpm, which would certainly help to get the o/p up to 40V+

42V on 52000uF would provide about 46 Watt-seconds

i don't think he's shown what is the drive requirement for his compressed 'star' coils

Romero's two drive coils drew 12W

let's say SkyCollection's drive pair was a lot more efficient - just hypothetical here - and only needed 3W

If the drive required as little as 3W then the MAXIMUM time which that cap could sustain the drive, alone, would be 46/3 = approx 15 seconds

the battery was disconnected at 2:45

at 3:22 the voltage on the cap appeared to be still as high as 32V - ie. it now contained 26 Watt-seconds of energy

in 37 seconds the motor had only used used 20 Watt seconds

an average power of 0.54 Watts

with our hypothetical draw of 3W, in 37 seconds the motor SHOULD have used 111W

so - either this motor is already EXTREMELY efficient (with ONLY TWO pickup coil pairs, so far) or it is ALREADY generating more power than it is using

as you can see, with only 26 Watt-seconds of TOTAL energy  left in the buffer cap (and not all can be used by the drive cct) the motor continued to run for at least another 20 seconds (whilst the video was still running)

obviously an efficient bearing will have a long run down time, and we don't yet know what that is for this device - but the information we have so far from the video looks VERY promising, in terms of confirming Romero's own achievements

i can now see why Romero said that he thought that SkyCollection would be one of the first to replicate Romero's success

it also points to the fact that our replications do NOT need to be so close to Romero's

good luck with the builds everyone!

np


http://docsfreelunch.blogspot.com

[k4zep]

Basically pretty much all values stated by Romero seem to be unfortunately
off from what they really are in his device. Maybe he wasn't going over groundloop's and Stefan`s diagrams with the necessary attention to be able to correct the values or he just built away and later on couldn't remember what
sizes of components he did indeed use for the device.
From my analysis of the coil close-ups, i am pretty convinced that he used
sewing bobbins. I base that conclusion on measurements i have taken on the image assuming that he did at least make not a mistake by stating that his core diameter is 6mm. If that is so then the length of the bobbin amounts to 11.5 mm
I have personally not been able to fit more than around 250 turns of 0.375mm wire on such a sewing bobbin without the wire falling off.
It seems even likely that like all other values for the device the 300 turns are a guess rather than a verified value.

I agree.  Yesterday, Just fiddling around waiting for parts in spare time between "Honeydoooos", I found I could not get more than 250 turns of #27/48 litz wire measuring .36mm actual diameter X about 30 feet (not measured, just a guess) on a sewing bobbin. Asking myself why, I measured the bobbin which is:  Internal core of 6.37 mm, external core plastic of 7.77 mm, 8.50 mm deep internal to bobbin, 10.55 overall and 19.89 mm overall diameter.  If you take account the material thickness, it is considerably smaller than the 6X10X20 mm nominally stated in core and depth on these pages.  I haven't tried my 4/30 litz wire which is .53 mm in diameter but suspect not more than 200 turns.  Of course the 4/30 could be wired bifilar and end up with up to 800 turns if I need more voltage.  In looking at the wound cores of M, I don't think there ever were 300 turns on them and as you say, a guess.  More likely 250 or so turns with the bulging coils and he did say he did not count the turns.

Ben K4ZEP

[nul-points]

[..]
you have to be very careful with spinning your rotors - do not try  all together at the same time - earth axis could be shifted away,
[...]
cheers,
khabe
PS:
I took covertly one sewing machine bobbin from box where my wife keeps this kind of stuff and tried to wind this bobbin with 0.5 mm wire
[...]

sounds like you've just put NASA out of a job, khabe!

who needs spacecraft when we can just navigate the earth through the solar system using our Muller Dynamos?

i like your thinking!

PS  better unwind that wire from your wife's sewing bobbin now - you might end up with an overunity patch, on your old trousers 

greetings
np


http://docsfreelunch.blogspot.com