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

[listener191]

Luc, one more question I have about the last picture you posted is how Pierre controls the direction of the current. The Arduino appears to only control the transistors that control the relays, but what determines if the top relay turns on or the bottom relay? I would assume one transistor controls both at the same time.

E.g. in your picture, let's say the left two relays with the forward flowing arrows are turned on with transistor 1 (so coil 1 on), then if for that particular coil he wants to switch current direction, what transistor(s) would he need to turn on? If he turns on the second transistor, it would give the same forward flowing current in the second coil, not reverse current. He would need to turn on the GND connection of coil 36 (controlled by transistor 36).

If he turns on the first transistor (so he gets the GND connection for second coil for negative flow), he would also need to turn on the third coil. Then he will get reverse current in second coil, but the third coil will also be on in forward direction. And he would have transistor 1 and 3 on at the same time. His Arduino code doesn't show any evidence of that kind of transistor switching.

PmgR

Hi Pmgr,

Yes you are correct, each high side relay coil is also linked to a respective low side relay coil, (6 coils further around the loop), so one line switches both hence only 36 control lines are need with his scheme.

I think this is what he started with and what he showed us however, as there appear to be less than 36 wires going to the stator, I wonder if he has paralleled the 3 north pole together and paralleled the 3 south poles together? That would reduce the wires to 12. The number of wires appears to be 28 but there are at least two wires going to the same contact on one of the connectors.

It would take some thought to realize what the effect of that would be. 

Regards

L192 

[cheors]

Pour faire tourner le champ magnétique régulièrement il faut activer 2 bobines adjacentes L1, puis L1 et L2, puis L2, L2 et L3,.... 
Or les bobines sont alimentés + - pour la première et - + pour la seconde.
Comme on veut le même champ pour le renforcer, il me semble que l'on doit bobiner L1 dans le sens horaire et  L2 dans le sens anti-horaire. 
Ainsi les bobines impaires seraient CW , les paires CCW.
A -t-on déjà parlé de çà ? Evident ou pas ? J'ai manqué quelque chose ? le secret de Pierre ?

To rotate the magnetic field regularly it is necessary to activate 2 adjacent coils L1, then L1 and L2, then L2, L2 and L3, ....
But the coils are powered + - for the first and - + for the second.
As we want the same field to strengthen it, it seems to me that we must wind L1 clockwise and L2 in the anti-clockwise direction.
Thus the odd coils would be CW, the even coils CCW .
Have we already talked about that? Obvious or not? I missed something? the secret of Peter?

[r2fpl]

They can be all CW or CCW does not matter. For convenience, there could be CW and CCW less connection distance. In the configuration, all CW can change the ends of every CW then there will be reverse polarity.

example:
all CW or CCW            = A1 .... B1, A2 ... B2, ..... the connection will be: A1 + B2 and B1 + A2
for once CW and CCW = A1 .... B1, A2 ... B2, ..... the connection will be: A1 + A2 and B1 + B2

Of course, it depends on the subsequent connections between the coil orders.

[T-1000]

In regards to sequence, each group have 6 coils N and 6 coils S for three phase rotation. Only 4 coils used at once before flipping over to other set.
So the the three phase sequence for moving magnetic field would be in coil positions:
1) V+2 V-5 and V-31 V+35
2) V+2,V+3 V-5,V-6 and V-31,V-32 V+35,V+36
3) V+3 V-6 and V-32 V+36
Then continuing to flip around ring over next shifted sets of coils.

[pmgr]

Hi Pmgr,

Yes you are correct, each high side relay coil is also linked to a respective low side relay coil, (6 coils further around the loop), so one line switches both hence only 36 control lines are need with his scheme.

I think this is what he started with and what he showed us however, as there appear to be less than 36 wires going to the stator, I wonder if he has paralleled the 3 north pole together and paralleled the 3 south poles together? That would reduce the wires to 12. The number of wires appears to be 28 but there are at least two wires going to the same contact on one of the connectors.

It would take some thought to realize what the effect of that would be. 

Regards

L192

Someone else stated that there are actually 5 green connectors in the video (hard to see), not four. So that would make 4x8 + 4 = 36 connections to the stator. Also, his boards show labels going up to 36.
PmgR