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Overunity Machines Forum



E-Orbo replications

Started by Omega_0, May 09, 2010, 09:30:12 AM

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Omega_0

May 09, 2010, 09:30:12 AM
Starting a new thread to post my own Eorbo experiments, as the original thread is already too big now. I will also post the replication attempts of others who are not on this forum (yet), as and when I get any news about them.

So update here :
Made some changes in the design. The magnets are now in NN config and are placed underneath the rotor more securely. Now even if they get loose and fly off, the edge of the rotor will stop them from coming out.
The bearing in on top now and is better centered with no tilt.
All these justify a version change, so lets call it ver 0.3.

As expected the cemf is gone with NN config (scope shot below). Now the funny thing is, there is some cemf (in my case 10 mV at 200RPM) when you measure it directly across individual coils, by spinning the rotor by hand. It does not become zero however precisely I position the coils. But when two coils are connected in series, in such a way that their cemfs cancel out, it becomes almost zero. Connecting the coils in aiding mode obviously increases the cemf 2x.

So a good lesson learnt is, always connect the coils in opposing way.

Now there is some trade off here, NN mode means less attraction which means less RPM, so my speed at the same current has reduced by half. This is not desirable, so I will try to go back to SN mode again and see if there is any way to reduce the cemf.
I have more respect for the fellow with a single idea who gets there than for the fellow with a thousand ideas who does nothing - Thomas Alva Edison

Omega_0

#1
May 09, 2010, 09:58:05 AM
I have more respect for the fellow with a single idea who gets there than for the fellow with a thousand ideas who does nothing - Thomas Alva Edison

Omega_0

#2
May 10, 2010, 04:18:28 PM
Got some decent speed improvements with air gap and reed optimizations. Now its running above 500 RPM. Unfortunately the cemf shows up at high speeds.

I loosely placed two pickup coils above the rotor, both with 500 turns and 25 mm dia. These produced about 3.1 V peak to peak AC at open circuit. Scopeshot is below with some data. (Purple trace is pickup and orange one is input pulses. Note that the pulse cuts off just after rise time, the inductance is too high)

I have 4 such coils, need some hardware changes to mount them. I can't capture the scope data, its software needs upgrade, so must wait for detailed calculations till the upgrade is available.
I have more respect for the fellow with a single idea who gets there than for the fellow with a thousand ideas who does nothing - Thomas Alva Edison

Omega_0

#4
June 19, 2010, 03:17:12 PM
Update: 0.6
Some important progress was made.
Good news 1 : Got hold of 8 medium-high Mu cores of material T38. This version has just one of these with 80-100 turns of 20 AWG and its rotating at 130 RPM. Rotor is same old one.
Good new 2 : SDK for my USB scope was released and I managed to modify some example code to dump the data in CSV format. At this time it cannot dump data sampled at more than 20 KS/s, so the very very fine details of waveform are not there. Anyway the data is here :

Captured data in Excel 2007 format:
http://www.overunity.com/index.php?action=downloads;sa=view;down=393

Good news 3: The Ein plot is very much similar to Steorn's demo-1, with similar "mountain ranges" and the peculiar negative going energy. This is a good verification that steorn did not play any tricks during the demo, as many skeptics still believe. I think no one else has published such plot before this. So its important one.
The current (Iin) plot shows no CEMF, finally. The Vin plot shows the flyback after the pulse ends. The spikes at the start of pulse can be due to reed switching on, but I'm not so sure about that. It should not be there.
The IV-I^2R (non-joule energy) is mostly near ZERO. Almost no power is transferred to the rotor (going 130 RPM on cheap bearings).
I have more respect for the fellow with a single idea who gets there than for the fellow with a thousand ideas who does nothing - Thomas Alva Edison
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