I just wondered if anyone has built a window motor. Its a more advanced design than the SG. It got a lot of popularity when a user who went by the name of 'Mike' posted this video with this diagram. You must be logged in to see this link.
It was then I decided to build one myself. I used 200 winds of #26AWG and some 1x4x3 ferrite block magnets, never used the transistors they kept showing in the schematic but used some MOSFETS instead to switch on and off.
Now, it certainly didnt self sustain, But I did notice a curious effect which I could not explain. Its input current went down when I put just the right amount of loading on the output. The motor also showed a speed increase in the rotation. Has anyone else tried this motor? Looking for some feedback.
I have not built one myself, but I have seen them running. One thing that is rarely mentioned in these setups is the info on the batteries that are being used. The batteries have to be conditioned many times so they charge faster and last longer. Even when built to the exact specs, I have yet to see one work with new batteries. They will run it, but will run out of juice. Conditioned batteries are what works the magic on such devices. It can be a slow process conditioning the batteries, but it pays off. I have not read through the link that you have posted yet, but I am sure you will read of many failed attempts. Always start out with the exact components needed and get a device working before you start swapping bits.