Muller Dynamo

[starcruiser]

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]

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 )

[nul-points]

[...]
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]

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]

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