Mechanical Resonance (Projects)

[tinman]

Well it's throw out week around our area,and i managed to pick up 3 more smart drive washing machines.
Now have all the copper wire i need for up and coming experiments



Brad

[tinman]

Speaking of resonant wave's,here is a little circuit i was fooling around with many years ago

Check out the wave form lol.

https://www.youtube.com/watch?v=AmR_Sqw7wv0

Brad

[Magluvin]

Im here at lunch break and adjusting positioning of the coils.  Still more positions to fiddle with, but Im finding it to be getting better as I go. The 2 coils are both 4ohm.

Im getting to where it is exceeding expectations between the in and the out.  If it were just the 2 coils face to face, I would expect less voltage from the pickup coil with simple induction. Very inefficient coupling. And even if the coupling were very good, I would expect only as much voltage on the pickup/secondary as I put in the primary drive coil. But here the pickup is kicking butt.  No loads yet. But I want to see how far I can get with this to see how much more voltage I can get out of the pickup vs the drive voltage. So far, 2 identical coils with just straight AC input, we are seeing it as a step up voltage converter.  I am very happy with that.

Mags

[Magluvin]

One good reason I am happy with todays results is the fact that we know the eff of use of the mags and coils is low.  So now, if I just worked on improving the input eff on the magnetic interaction, at the same input, my output will be more. That test above is 40mw input.  Then improve the pickup side eff, i think it will be a good thing.

The other day when I had gotten near equal voltage on the output was encouraging with the low eff setup. I was thinking, it has to get better due to just the thought of low eff of the magnetic couplings. Soo there it is.

Moving forward....

Mags

[Magluvin]

One more thing. The input trace peak reading is a bit high due to spikes on the amp ch.  So the real sine peak is a bit lower than that. I calculated the input power based on that peak measurement with the spikes. So the input should be a bit lower than 40mw with a clean input. 

Once we get some good base measurements here with this setup, then we rebuild for higher freq which will increase eff even more, as has already been confirmed to do so.

Mags