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

[listener192]

Listener
Very clean and nice work. Well done! What is your diodes type?

Thanks. I always try to start clean but typically things get messy when you start modifications.https://www.ebay.co.uk/itm/10-x-10A10-Rectifier-Diode-10A-1000V-/282075900975
Diodes were a cheap compromise however, if I start seeing large recovery currents I will change for a higher spec diode.

Regards
L192

[listener192]

WOW!... excellent job L192
Is that a 30 or a 36 slot stator?
How many segments surfaces does your rotor core cover?

Today I received the 40 Heavy Duty Dual Half Bridge
Thanks for sharing
Luc

Hi Gotoluc,
This one is the 30 slot stator and the rotor covers 9 poles, which is a lot more than the 5 pole coil pitch. I will cut the rotor down but that's not what is impeding induction, as I tried a large coil on a rectangular section and got about the same output.
I am not getting the result I had with the L298N half bridges, although I never had all my coils running with that setup. Of course I could run those at 50/60Hz whereas 5Hz is really pushing the relays and I have noticed incomplete current waveforms at that rate.

With 20V DC input I can only scrape about 100mA out of the rotor coil .The only other thing that has changed, is that  I removed the magnets from the rotor.
I have a couple of relays setup as a DC polarity reversal switch however, I can't run these at more than 4A, as the 10A rating is not enough to deal  with the combined current from the 6 coil sections.Initial experiments running DC reversals either every step or after every complete sequence, have not yielded anything interesting to report.



Regards
L192

[pedro1]

Continuer vous êtes sur la bonne voie ,bravo
En. Bravo!... continue, you are on the right track

[r2fpl]

Hi Gotoluc,
This one is the 30 slot stator and the rotor covers 9 poles, which is a lot more than the 5 pole coil pitch. I will cut the rotor down but that's not what is impeding induction, as I tried a large coil on a rectangular section and got about the same output.
I am not getting the result I had with the L298N half bridges, although I never had all my coils running with that setup. Of course I could run those at 50/60Hz whereas 5Hz is really pushing the relays and I have noticed incomplete current waveforms at that rate.

With 20V DC input I can only scrape about 100mA out of the rotor coil .The only other thing that has changed, is that  I removed the magnets from the rotor.
I have a couple of relays setup as a DC polarity reversal switch however, I can't run these at more than 4A, as the 10A rating is not enough to deal  with the combined current from the 6 coil sections.Initial experiments running DC reversals either every step or after every complete sequence, have not yielded anything interesting to report.



Regards
L192

L192,

Current does not have to be large. I think 3-5A is enough. Do not think about increasing because this is not the way.

[pmgr]

This is my 30 slot relay build.
The diodes are paired, each is rated at 10A continuous 50A pulsed. These recover narrow spikes of charge current to the super caps at each coil turn off (see attached). There is not much in the way of rotor induction.
Regards
L192

L192, very nice build!!

How do you have your capacitor bank connected? Take a look again at Pierre's very first video. The positive of the capacitor bank does NOT go to the relays. It is only connected to one end of the 4ohm resistor AND to the return of the diodes (but not the relays).

Make sure you have the 4ohms resistor in place.

Also make sure that you drive the switch contacts of the relays (not the Arduino contacts) exactly as Pierre does (see black and red wire in first video top of relay 72): again, they are NOT connected to the capacitor bank, but they are connected to another smaller 400V capacitor (the one that connects to the rectifier diode bridge) through the thin red wire and they connect to the other side of the 4ohm resistor. Makes sure to use a high voltage capacitor.

Then hook up the potentiometer to change the timing of the relays and change it very slowly until you see something happen on the output coil, then fine-tune the timing.

PmgR