posted on Dec, 7 2016 @ 02:35 AM
I like the initiative you have put forth and the fact that you have not only told us in your opening post what you are thinking of but you actually
provided plans and not a wait and see scenario like I have seen so many times on this site.
I do have some things for you to think about though, some may have been mentioned already but I wanted to be sure I covered all of my thoughts here in
one swoop. Here goes.
1) Eddy Currents: There will be plenty of them and whether you think of them as back-EMF or any other force, they are responsible for losses in any
system using electrical or magnetic fields. You will have them, they are inevitable.
2) the bridge rectifier is going to cause loss and since it is a full wave, you should use one with the lowest forward voltage drop you can get away
with. You could try individual Schottky Barrier Diodes in the appropriate configuration.
3) the motor and the switching arrangement, this looks like a problem since I do not see you reversing the motor to boost in the appropriate direction
of spin. Also, trying to spin the motor in the opposite direction that the suspended part is turning may just ultimately load the motor down or worse
actually start to stall the inertia of the current rotation instead of amplifying it. You would need to know which direction to switch the motor on
and time it or, possibly better, have a current sense shunt on the input to your storage capacitor/battery and only when the current falls below a
threshold and the motor demand switch is active should you let the motor draw power. A power switching MOSFET and a level comparator circuit should
be adequate here. I think fine tuning this for a given output load may help lengthen the time it will run for though I am not seeing enough overall
gains to make it perpetual, especially under a load.
4) what are you planning to use for the string? It should be something not containing cotton, most likely a synthetic that will resist absorbing
moisture or drying out as can happen in various humidity situations. Too much humidity and your string may start to create more friction or the
torsion will change. Too dry and it may not last long and shred.
Again, I love your vision, just not sold on it based on what I know, not yet anyhow.