STEORN DEMO LIVE & STREAM in Dublin, December 15th, 10 AM

[teslaalset]

@Omega_0,

Tried to upload an Excel file but even compressed it's too big for the size allowed here (maybe that's due to the fact that I moved to Excel 2010). I'll say it in words, though -- from the data it is seen that the OU effect is almost exclusively due to the heating of the primary coil. In other words the equality VoIo = IoIo is nowhere near obeyed. All the action, as I already mentioned, is in the primary coil and you don't even need the secondary one for OU to be observed.

@omnibus
There is a possibility to upload files with a max. size of 5 MB here:
http://www.overunity.com/index.php?action=downloads;cat=25
At the bottom of this page you can 'add a download'.
Maybe you could give this a try?

[Omnibus]

@Omega_0,

Calibrated probe is the answer and I may have to shed some dough for one. Like you said, even if one decides to do calorimetry there still would be the problem with the correct I measurement. The first step is to order precision shunts, however, which should happen on Monday or maybe Tuesday because of Memorial Day. What I'd like to show you, however, is the really strange behavior of the current at some frequencies. I think that lies at the bottom of the observed OU effect and probably makes the current accuracy measurement a moot point at this stage. This is some reaction of the core that has to be understood.

[Omnibus]

Here is a plot of the difference between the maximum and the minimum voltage, respectively current at various frequencies. Notice the sudden drop in current after around 50Hz, its further decrease till around 70-80kHz but then a steep increase from around 100kHz. That steep increase of current with increasing of frequency is not to be expected and that's the peculiar reaction of the core I was talking about. Notice that the maximum of the OU effect is around 450kHz. It should also be noted that the current trace is quite distorted up  to frequencies of about 500Hz after which the shape of the current trace regains its sinusoidal shape matching the shape of the voltage trace. Voltage trace does not seem to undergo much changes. A change in the phase shift is also observed but you'll have to bare with me because I'm not done with that data yet. I'll post it as soon as I'm ready.

[Omnibus]

This graph shows the phase shift of V with respect to I. When V is lagging behind I the phase shift expressed in us is positive, otherwise it's negative. Notice the reversal at around 47kHz when the I starts to lag behind V. The phase shift after that reversal is slight and tends to decrease as the frequencies get higher. Again, recall that the maximum OU effect is observed at around 450kHz.

[gyulasun]

@Omnibus,

Please clarify the 45kHz for the biggest OU effect because you wrote in the last but one post 450kHz for it.

What if you place some capacitor in parallel with either the primary or the secondary coil of the transformer to see if you can tune the zero phase shift frequency spot away from the 45kHz? Maybe a few nanoFarad or some tens of nF caps could do for a start.  IF you disagree with this, it is ok of course. This way maybe some kind of resonance around 45kHz could be detected?

rgds,  Gyula