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Author Topic: Muller Dynamo  (Read 4321603 times)

starcruiser

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Re: Muller Dynamo
« Reply #945 on: May 12, 2011, 11:17:31 PM »

chrisC

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Re: Muller Dynamo
« Reply #946 on: May 12, 2011, 11:23:23 PM »
try this link for a complete package deal just need a servo tester, the next link

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=4166

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8296

@starcruiser - Great! Thanks also to woopy too.

chrisC

woopy

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Re: Muller Dynamo
« Reply #947 on: May 12, 2011, 11:24:05 PM »

@ Woopy . Brilliant bobbins . where did you buy your cores please?
[/quote]

in germany at "conrad electronic"  part n0   501 633

hope this helps

laurent

hartiberlin

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Re: Muller Dynamo
« Reply #948 on: May 12, 2011, 11:24:54 PM »
@Laurent
Good find with the sewing machine bobines.
@All replicators,
good work so far.
Hope to see soon some first data.
Also a 3D magnetic flux simulation is coming from one member.

I am just uploading the RomeroUK HD movies to some sites so
also our Chinese friends without Youtube can enjoy them.

Regards, Stefan.

hartiberlin

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Re: Muller Dynamo
« Reply #949 on: May 12, 2011, 11:27:14 PM »
Okay, the selfrunning video from RomeroUK is up now at:

http://www.multiupload.com/ETDN8T2EAM

It is about 350 MB big and is ZIPed.
Unzip and you get an MP4 movie file in HD format.

Hope this helps the people around the world, who have no access to youtube.

I am going to upload now the other 2 movies.
Regards, Stefan.

powercat

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Re: Muller Dynamo
« Reply #950 on: May 12, 2011, 11:28:20 PM »
The first picture shows  a close-up of sum magnets on the top side.
The second picture is of the underside, sorry it's the best one I could find.

k4zep

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Re: Muller Dynamo
« Reply #951 on: May 12, 2011, 11:36:44 PM »
@ Woopy . Brilliant bobbins . where did you buy your cores please?


in germany at "conrad electronic"  part n0   501 633

hope this helps

laurent
Go to any sewing center that  your wife likes to go to for fabric and thread, cloth you will find all kinds of sewing bobbins, I have used them for many projects.

Ben K4ZEP

bourne

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Re: Muller Dynamo
« Reply #952 on: May 12, 2011, 11:42:49 PM »
Seeing as though Neptune & Nul-points have separately mentioned my recent video, I will post it here for you to see.

The effect I am seeing is 'Presessional'

Each rotor magnet forms a segment of the circle, for each segment rotated CW you get 8 'events' on all the coils in sequence CCW.

So for each full rotation of the rotor, lets assume it has 8 magnets, you get 8x8=64 magnet/coil interactions each creating an overlapping weave of pos/neg peaks opposite to the direction of travel.

http://youtu.be/Gw652NrIFM4

I also know some of the things I say in the video are WRONG, part 2 will correct it and more

starcruiser

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Re: Muller Dynamo
« Reply #953 on: May 12, 2011, 11:44:06 PM »
from what I saw in the prior video it was a standard radial bearing (skate board), IMO those would be best used with the rig on its side since the bearings used are not designed for that type of load, you would require thrust bearings to have it work long term as it sits. This orientation will provide additional drag/friction.

I use both types in my RC helicopters, typical RPM 3000 on the main rotor and 12k rpm on the tail and I use ceramics too, ABEC 3 or better. I go through bearings and can tell you they will not stand up well as shown. Build it as is but expect the bearings to get notchy and bind after awhile.

I would get some good skate board bearings to start, they are cheap enough

DadHav

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Re: Muller Dynamo
« Reply #954 on: May 12, 2011, 11:58:49 PM »
John,  thanks for that info and link.  Can you provide links to any other favorite motor sources or do you think HobbyCity is best?  Do you have links to something like that $10 servo tester and maybe the 20 amp speed controller for around $10?  Thanks again for your help here!

Hello.  I didn't look to far but just tagged a couple items on HK. I'm in no way recommending these exact parts but they are typical of the inexpensive choices. You can spend 10 times the price for guaranteed quality motors and drivers. I gotta ask this. Do you really want the excess baggage of the electronics just to have a motor for testing alignment and tuning? There should be some really good surplus DC motors as well.
You know if you do a search for servo driver circuits, you will find some simple 555 timer circuits you can build yourself.

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10531
Servo Tester

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=2164
Typical Speed Control

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8487
Typical inexpensive outrunner.

John H

starcruiser

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Re: Muller Dynamo
« Reply #955 on: May 13, 2011, 12:02:21 AM »
try a castle creations ICE 50 :)

OR a Scorpion out runner, that will set you back a few bucks. try a Kontronix ESC ($400) ouch!

excessAlex

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Re: Muller Dynamo
« Reply #956 on: May 13, 2011, 12:03:58 AM »
I think that to get a real benefit from the unbalanced design  ( 9 coils / 8 magnets ), the core of the coils should be of the same section ( diameter ) of the magnets (round magnets and cores ).. then you should work with magnets that grow in height rather than width. that's just my feeling..
It would also reduce the refining operations of the setup .. you think might be right? ( sorry for my bad english )
« Last Edit: May 13, 2011, 12:25:49 AM by excessAlex »

nul-points

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Re: Muller Dynamo
« Reply #957 on: May 13, 2011, 12:11:20 AM »
[...]
 It looked like Rom's motor wasn't running real high RPM's. Does anyone know about what range the target would be?
John

John

from a frequency analysis of Romero's video when running without battery,

the spectrum shows a broad peak (of several hundred Hz width) centred on 188Hz
(over a 1 second snapshot)

however, if that was the rotor audio component then that would make it around 11000 rpm

i understand Ron to say that acrylic wouldn't cope much above 1000 without some re-inforcement

it should be noted that this rotor was apparently constructed from 3 or 4 layers glued together

iirc the run-down period is approx 100s

hope this helps
np

[Edit: if 188Hz represents the 8x magnetic field rotation then rotor rpm would be approx 1370]


http://docsfreelunch.blogspot.com
 

hartiberlin

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Re: Muller Dynamo
« Reply #958 on: May 13, 2011, 12:18:52 AM »
Okay, the first video from RomeroUK is now online here:

http://www.multiupload.com/OWA1FAZ39H


It is about 216 MBytes big ,
again a ZIPed MP4 movie file.

It shows his first step in getting more output on a lamp
load than putting into the motor part.

libra_spirit

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Re: Muller Dynamo
« Reply #959 on: May 13, 2011, 12:20:41 AM »
Is it true that the magnetic field density off the end of an N44 is the same for all thicknesses of that magnet type?

Stack a bunch of neo disc magnets. Now if you cut the stack in half the pulling power off the end will not change. N44 has the same flux density no matter its stack thickness.

Diameter will increase or decrease the flux present, but thickness will have little effect.

Also on the pulses 8 x 8  = 64 is not correct. There must be even magnets on the rotor and odd number on the stator. Each coil will feel one less pulse then each magnet feels on one rotation.

8 magnets each passing 9 coils will recieve 72 pulses total not 64.
9 coils each having 8 magnets pass it will recieve 72 pulses.

The vibrational frequency on each ring will be different however. This is because each coil will recieve one less pulse then each magnet per rotational time peroid. There will be a frequency split between rotor and stator for each component present.

The rotor having even number of platonic form pattern will down shift to lower harmonics of vibration.
The stator having odd or prime count will not downshift frequency but will upshift it due to cancellation of vibration as it moves around the rings. Phase shifts on an odd count loop will tend to cancel as they start the second trip around the loop. This is a scalar energy amplification on the vibrational side.

Cancelling vibration, is a technique found in Slim Spurlings work. It is also found in JC type systems on cars. The path where vibrations cancel, causes a smoothing out of the vibration overall.

Dave L