Working Magnetic Motor on you tube??

[blue_energy]

@Blue energy,
The MP3 was impressive - well done!

174Hz = 174 beats /second = 10440 beats / minute

8 rotor magnets passing the stator would give 1700 rpm x 8 / 60 =  226Hz

174Hz would imply a rotor speed of 1305 rpm and a stator speed of 5220 rpm.

Regards
Rob

AND - 5220 rpm could be a stator scraping once per revolution, 87 per second - which would make 174 Hz the 'first overtone': exactly an octave higher - a much more reasonable accoustic relationship.

But - Al says, very clearly, that the rotor rpm, at just that moment, was '...about 1700'.  So - something isn't making complete sense.  300 rpm is a lot of variance.

<edit> 5220 - not 5200...

I noticed AL was taking quick readings that may have caused errors, it is also possible that "light" from the fluorescent lighting was affecting readings

I posted this before, but here is his run down test with stated rpm at each stage, I do not like the way this forum shrinks quotes to the point where I need a magnifying glass to read them, so please excuse my use of bold and italics instead.
http://www.steorn.com/forum/comments.php?DiscussionID=60132&page=17&Focus=2271368#Item_19

Nevertheless, I have started the unit. It is currently running with the rotor going counterclockwise, the two idler stators stopped (seeing each other nicely across the spinning rotor) and the "middle" stator spinning antigearwise, that is also counterclockwise in this case.

For some reason it seems to be working rather well tonight. The rotor rpm is 1334, the stator rpm is 5378. It was difficult to start, it took maybe 20 flips of the stator magnet in all before it "caught". But I am developing a thumb technique that is easier than the finger.

I started it at 02:14.
It is pretty noisy with the bearings chattering and growling, but I think I might be able to sleep.
Now, If it is still running when I have to go to work, I am going to have to stop it manually.
There is absolutely no way that I will leave it running unattended (by me.)

Good Night. Please pray for me.


And he continues in that thread to document.

Right at the end of the video he says, "OK, now we're over 4,000, almost 5,000 rpm on that small magnet" - so, the 1,700 rpm reading on the rotor earlier - which, now that I'm not listening to only pieces at a time, happened before he even stopped the secondary stators - doesn't make sense. 

[Yadaraf]

Yadaraf wrote:

...because the 2nd harmonic of the power line is quite obvious at 120 Hz.

Hi Yadaraf.

Not wishing to appear overly pedantic  but the 120Hz buzz could actually be the dominant fundamental if the hum is the result of a poorly regulated supply, or burst noise from full-wave rectification getting into the amplified mic path. I think that the latter is most likely, particularly as broad-band harmonics of burst noise are evident well into the kHz region, so the only means of filtration is a comb notch filter.

There's not so much envelope power in the higher harmonics though, so I'd guess that heterodyning shouldn't significantly impact upon your spectral analysis - but only a guess though 

All the best,

FunkyJive

FunkyJive,

Thanks for the thought:  "Not wishing to appear overly pedantic  but the 120Hz buzz could actually be the dominant fundamental if the hum is the result of a poorly regulated supply, or burst noise from full-wave rectification getting into the amplified mic path."

I used some different software to analyze Al's FLV audio.  The software allowed me to capture several spectral graphs during the few seconds of acceleration [overlay 1 = start, overlay 4 = end).  See attached.

With the new software it appears that a frequency shift around 170 Hz can be seen.

Cheers,   

Yada..
.

[AndreaGanora]

Hi guys

Here is the link to the last video I?ve uploaded on my youtube channel

http://it.youtube.com/watch?v=TRS4_3F4lpc

It's a collection of different setup pics and some infos about my replication rig plus couple of video cuts about the rig spinning in AGW sinch and generating if not enything else , at list some interesting audio with many frequency changes that will maybe interest those of you that are into sound spectrum analisis , sadly i have no data about the rpms since I don't have jet a tachometer.

Good luck everybody with your projects

[jfarmer408]

Very nice video AndreaGanora!

[Yadaraf]

RE Audio analysis of second prominent tone near 850 Hz

Studying the interference at 174 Hz was easy.  I'm trying the same for the 800-900 Hz tone, but it's more difficult.

In the meantime, here are some spectrum graphs acquired for the acceleration in the FLV video.

Cheers,   

Yada..
.