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

Thank you on the mp3 praise - and thank you more for gently pointing out that rpm and Hz are fundamentally different!  It's always the most fundamental of the small details that get me - the one's whose magnified influence is most embarressing.  Is it that way for you?

[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...

[RunningBare]

@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.

[Yadaraf]

@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 - 5200 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.

Blue,

I just performed an interference test on the WMV file.  The WMV appears slightly different, and I get closer to 178 Hz at 4700 RPM -- near end of video.  When I sample the FLV (i.e YouTube) I get 174 Hz.

I do the interference test a little different:  Near the end of the video -- where there's no voice over -- I sample the audio for one second, create a loop, and then do a sweep from 170 to 185 Hz on the loop. In the attached MP3, there appears to be a lock at 178 Hz.  The "ticking" in the audio is from stitching together the 1-second files.

As for RPM, I've been using 1700 and 4700 per Al's spoken comment.


Cheers, 

Yada..
.

[Omnibus]

@Yadaraf, @blue_energy and @MeggerMan,

This is a sound sample of my rig with only stator rotating gear wise. I span the rotor by hand as uniformly as I could to keep it at 259rpm (monitored by a laser tachometer). As you can imagine maintaining by hand a constant rpm isn't easy so it fluctuated between values some reaching 280rpm. Nevertheless, it may probably be interesting to see what this will look like in the frequency domain anhd if the recent discussion can explain the fundamental frequencies observed.