Pierre's 170W in 1600W out Looped Very impressive Build continued & moderated

[listener192]

Hi Everyone
Whats happened?
Pierre's videos down again from youtube...has he gone underground??

Did he get threats (like what always happens with loopers)

Is Gotoluc no longer posting?

Whats going on?

Has anyone replicated Pierre's DZ generator with half decent results yet??

I am still building.

I have all the switching running with relays, just need to complete power wiring and diode board hookup.
Also got  a 36 slot stator, (no rotor for this yet). This one was vacuum varnished and the laminations held by the casing which was a mazac casting.
The whole thing needed to be heated in an oven to release old windings and slot liners. I made frames out of the old bearing end caps to hold the whole stack together.
Regards
L192

[gotoluc]

I am still building.

I have all the switching running with relays, just need to complete power wiring and diode board hookup.
Also got  a 36 slot stator, (no rotor for this yet). This one was vacuum varnished and the laminations held by the casing which was a mazac casting.
The whole thing needed to be heated in an oven to release old windings and slot liners. I made frames out of the old bearing end caps to hold the whole stack together.
Regards
L192

Thanks for the update L192... I was wondering if you were still at it.Not much new to report on my side other then when I re-positioned all my stator coils to 5 slot space I forgot to also reposition all my H-Bridges, so they were still at 6 slot spaces. So you can imagine that did not do well and have since found 9 of the H-Bridges that are fried. So I can no longer test.
I have someone that will buy 30 of these for me to continue: https://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&toolid=11800&pub=5574900467&campid=5338252492&mpre=https%3A%2F%2Fwww.ebay.com%2Fitm%2F200950936475%3FrmvSB%3Dtrue
It will be a week or more before I receive them.
So without a doubt this confirms the L298N are not going to be able handle the current no matter if you have one or even two per coil.
Regards
Luc
Fr. Merci pour la mise à jour L192 ... Je me demandais si tu étais encore là.
Pas grand chose de nouveau à signaler de mon côté, mais quand j'ai repositionné toutes mes bobines de stator à 5 fente, j'ai oublié de repositionner tous mes ponts H, donc ils étaient encore à 6 slots. Vous pouvez imaginer que ça n'a pas bien marché et depuis jai trouvé 9 ponts H-frits. Donc je ne peux plus tester.
J'ai quelqu'un qui va acheter 30 ponts H pour moi pour continuer les test: https://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&toolid=11800&pub=5574900467&campid=5338252492&mpre=https%3A%2F%2Fwww.ebay.com%2Fitm%2F200950936475%3FrmvSB%3Dtrue
Ce sera une semaine ou plus avant que je les reçoive.Donc, c'est confirmé que les L298N ne son pas capable de gérer le courant, peu importe si vous en avez un ou deux par bobine.
Cordialement
Luc

[listener192]

Hi Gotoluc,
I will post a photo when I have the build finished.
Let us know how the new bridge boards perform. I have one of those on order for testing.
I also destroyed about 5 of the L298N's and decided to try relays next.

Regards
L192

[T-1000]

I also destroyed about 5 of the L298N's and decided to try relays next.

Hi L192,

Seems you do not have shotky/zener diodes for protection there? The reverse currents will allways blow up transistors if there are no blocking diodes in series.
And because it is IC I would strongly recommend driving external power mosfets with them which have protection so no more burned parts will end up on your bench.

Cheers!

[onielsen]

Hi L192,

...The reverse currents will allways blow up transistors if there are no blocking diodes in series.
And because it is IC I would strongly recommend driving external power mosfets with them which have protection so no more burned parts will end up on your bench.

Cheers!

It is the voltage that changes sign (and perhaps size) from input to output (flyback pulse). The current through a coil must be continuous. That is it mustn't make a jump. This is exactly the opposite of what happens for capacitors where it is the voltage that that is continuous and the current that changes direction (and perhaps size) when the power changes direction from input to output.

A diode can clamp the voltage to a safe level. The current then can be directed to somewhere else or be dissipated as heat in the resistance of the coil. A Zener clamp will dissipate the power as heat in the Zener diode. Be sure the Zener diode can handle that power.

More on snubber protection: https://wiki2.org/en/Snubber

Regards
Ole