Muammer Yildiz Magnet Motor

[Cherryman]

I did see the English transelation of the video was a bit short.

So for the few of you who do not speak Dutch:

The man Han Vriezen did gave some comment in Dutch that was not very well transelated he says:

"At this moment i do not think anyting about it, as long as i did not see the last part, we know nothing." 

Then he continues:  "But we do think we understand the working, the principle, we are 95% sure about how it operates" 

And at last: "I do state , without the last part exposed, it does not proof anything"

[Omnibus]

@zerotensor,

Can you say a little more about your spectral analysis. How exactly does it show slowing down and an what the approximate rpm decrease would that show, if rpm's can be determined at all from this?

[Gwandau]

I made a closeup image of the partly dismantled motor, and found a quite descriptive image of the rotor and its basic magnet configuration,
dimly visible behind the inner plastic cover.

This plastic cover is made of separate stripes which are overlapping each other, thus canceling out or dimming the sight of the magnets.
By enhancing the contrasts and other graphical parameters in the image the magnets got quite visible. The first image below is just an
unaltered closeup. The second image is enhanced and altered to highlight the magnet configuration.

It's ten axial rows of magnets placed in a hexagonal pattern with a central magnet in each hexagon. This pattern results in the typical
Perendev displacement setting of 20 degrees. This is a Perendev motor!

Gwandau

[zerotensor]

@zerotensor,

Can you say a little more about your spectral analysis. How exactly does it show slowing down and an what the approximate rpm decrease would that show, if rpm's can be determined at all from this?

The horizontal axis is time; the vertical axis is frequency.  A number of harmonics are visible as horizontal stripes in the spectrogram when the machine is running.  The duration of the audio clip is approx. 3 minutes.  One can see that the frequency bands are not perfectly horizontal.  Instead, they dip slightly.  This is especially evident when the video transitions from before the airspeed test to after.  The sound produced by the machine gets a little lower in pitch.  The amount of pitch decrease depends on the band in question.  For one prominent overtone, the pitch goes from about 400 Hz to 390 Hz  (-10Hz).  For the lowest frequency band visible, the pitch goes from approx. 202 Hz to 197 Hz (-5Hz).  Determining the RPM decrease depends on the relationship of the overtones measured to the angular frequency of the shaft.  Here's a "back of the envelope"-style calculation:

If we assume that the initial speed of the rotor was about 1200 RPM = 20Hz, then the 200 Hz band would be the 10th overtone.  The corresponding dip in shaft frequency would then be, -5Hz / 10 = -0.5Hz.  This would mean that the RPMs decreased by, 0.5 Hz = 30 RPM.  (~1200 RPM start, ~1970 RPM end).

Regardless of the actual relationship of the frequencies to the shaft speed, I can say for sure that there is a definite and significant drop in the frequencies produced by the machine over time.

[Low-Q]

I did a spectral analysis of the audio from the demonstration.  It appears that the machine slows down a little bit.  Here is a portion of the spectrogram:

I can confirm your findings. There is a peak about 403Hz in the beginning. This is the 2.harmonic distortion due to turbulence from the blades. It is 5 blades, so the rpm starts with 2418 rpm. At the end of the test the frequency peak is at 390Hz. This is 2340 rpm - a reduction of 3,3%. If the coils in the machine is used to prevent high rpm, these coils should get warm and have less influence on the rpm - so the rpm should in fact increase during the test. This does not happen.

However, the speed is pretty much constant for the first 100 - 110 seconds after the motor starts, the peak frequency is at 403Hz straight. Then there is a camera shift. From there the speed is pretty much constant 390-392Hz untill till the motor is stopped.

I strongly believe this is a hoax, but one can never be too sure. Hopefully the camcorder that was used have an unlinear clock to control the frames per second - and also the sound (Yes, clock speed change a little with the change in battery charge). New battery in the camcorder after this small break in the movie?

So there is still doubts if this is a hoax or not.....

Vidar