Thanks for putting that list together. Been a while since I looked at his site. Now, does anyone have an idea of what this guy is getting at?
A short summary of his basic idea would be nice, if anyone could conjure that up. His circuits are very simple so not too much going on there.
Even with auto translate, I have a hard time following him. He does make nice drawings though.
Apologies for resurrecting this thread, but I've been taking a look at this the past few days and my findings seemed relevant to this topic.
A magnetic core is a magnetic field concentrator. Magnetic fields that surround a core are concentrated in the core. Cores that have a better
permeability have a more concentrating effect on the magnetic field. Metglas has the highest permeability of all since the relative permeability of vacuum/air is 1 and Metglas is 1,000,000.
If you have a magnetic field established outside of the magnetic core at a distance, i.e. there is a significant gap between the core and the windings, then that core is essentially invisible to the coil that generated the magnetic field and doesn't result in any load on that coil.
What Melnichenko is doing is generating a magnetic field in an electromagnet (coil) that is loosely coupled to a magnetic core. He is then using another coil wrapped tightly around that core to generate a current.
There is also the implication that he is blocking the current from flowing when in the magnetization phase i.e. when the magnetic field is being established (red area in graph below) and allowing it to flow during the demagnetization phase i.e. when the magnetic field collapses and inductive kickback occurs (green area in graph below).
Here is a circuit diagram that best describes what he is demonstrating in one of his videos:
This reminds me of the following Don Smith device:
In the above there is a changing magnetic field due to the periodic firing of the spark gap. The transformer core concentrates the magnetic field / flux and has a winding around it that provides the output.
I'm looking at this circuit on my bench right now and my initial findings are that this effect is something worth pursuing further. My setup is a large coil placed orthogonal to and situated a few millimetres from a large Metglas AMCC-1000 core which has a 10 turn winding of 2000-strand Litz wire. I've found that I can generate a current of up to 2 amps in the Litz winding using the external coil which is pulsed at 10% duty cycle at 1KHz. The waveforms I'm seeing look similar to the scope shots shown in Melnichenko's videos. There is a sharp peak and then a slow decline for each pulse.
I'm using a 0.1 ohm current shunt resistor (Bourns PWR220T-35-R100F) hooked up to a 1:1 BNC probe to determine the current flowing in the Litz wire.
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Topic: The Work of Andrey Melnichenko (Read 12668 times)
