170 watts in - 1600 watts out - looped - Very impressive build and video

[memoryman]

MEM: it is YOU who doesn't understand. A storage medium should NOT be needed in a true self-looped OU device.
Its presence is a red flag. There are other red flags too.

[konehead]

Hi Listener
Sorry about my ignorance - but what is an "8 slot pitch" ?? Does this mean 6 poles wrapped with wire through 8 slots in existing standard wiring? Or something else???
Thanks
Konehead

[pmgr]

Here is one animated GIF that show how the output coil couples back to the input coils (you will have to save the GIF file to your computer and open it with the regular windows built-in Picture and Fax viewer to see it animated)


Very interesting behavior. The back-flux generated by the output coil folds back half-half over the stator and mainly only impacts the coils that are positioned where the output coil steel meets the stator steel. As such, BEMF can be collected from those coils as a bonus. The amount that feeds back to other coils further away is very small (see the animated gifs).


Btw. I note we have no idea how the coils on the stator are actually wound and connected. Is it 36 separate coils, are some slots connected in series, parallel, if so which ones, do the coils have a center tap point, etc. What is the number of windings per slot and what is the wire gauge, etc. Basically, we need the exact configuration of the stator/coils.


Gotoluc, this is most important to get an answer to so that we can simulate the actual coil configuration.


Other things we need to know are how the relays are hooked up to the coils (and why there are two relays per coil as you could switch a coil with just one relay). I would think there are two relays per coil to completely disconnect the coils from the driving circuit and have it only connected to the two recovery PDs. Same for the two PDs. Why are there two PDs per coil? Are they in parallel to allow for larger current? Probably not as each of them has a separate wire going to it (if they were in parallel Pierre could just have connected them in parallel on the board). Most likely each coil has a center tap point that can be grounded and then there is a diode on each end of the coil to recover both the positive and negative cycle of the BEMF and feed it into the capacitor bank.


PmgR
====
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[listener191]

Hi Listener
Sorry about my ignorance - but what is an "8 slot pitch" ?? Does this mean 6 poles wrapped with wire through 8 slots in existing standard wiring? Or something else???
Thanks
Konehead
[/quote

Hi Konehead,

For example a coil wound through slot 1 and slot 8 then the next coil wound from slot 2 to slot 9 then 3 to 10 and so on.

This is called lap winding.

You can see looking at the stator that the coils are not wound around adjacent slots but they pass behind the next coil (lapped) then reenter the stator some number of slots further along. My estimation is an 8 slot pitch.

You need to encompass a certain amount of steel with the coil if you want to develop some meaningful flux.

Regards L192

[listener191]

The question of why two relays.

This is like the two transistor switch that is used commonly in industry for switching stepper coils etc. The switches or say MOSFETS only have to be voltage rated at rail for this type of switch and it will recover energy from the coil in either direction, with minimal loss.

L192