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

[d3x0r]

Interesting d3x0r

Thanks for sharing

Luc

BTW, today I took all my stator coils out and reinstalled them to a 5 slot space (pitch) instead of 6 and when I was done, now the windings look exactly like Pierre's stator.
I must of also had an error in the winding sequence since it is a drastic difference. I'm hopping this solves the low output issue.
I have no idea how I had the coil sequence before but now I feel confident it's done right seeing it looks like Pierre's.
Pictures below is, first, my Stator windings before, then Pierre's Stator windings, then my rewound Stator. Notice how the windings now curl.

Nice
The first 25-ish windings, they are winding from on top of another coil, to an empty slot.  (acutlaly the first 5 were empty slot to empty-slot... )   When you get to the one that ends in the first slot, then you're then winding on top of a coil and on top of a coil - shouldn't cause any notable difference.  If you could have had them all preassembled you could have stacked them such that the last 4/5 are behind the first coils...

Although I doubt it results in any meaningful effect on the magnetic field produced  

[d3x0r]

(added 30-4 sketch in previous)

[pmgr]

Interesting d3x0r

Thanks for sharing

Luc

BTW, today I took all my stator coils out and reinstalled them to a 5 slot space (pitch) instead of 6 and when I was done, now the windings look exactly like Pierre's stator.
I must of also had an error in the winding sequence since it is a drastic difference. I'm hopping this solves the low output issue.
I have no idea how I had the coil sequence before but now I feel confident it's done right seeing it looks like Pierre's.
Pictures below is, first, my Stator windings before, then Pierre's Stator windings, then my rewound Stator. Notice how the windings now curl.

Hi Luc, good to see you are still working on the setup! Been busy but hope to get in touch over the weekend.

While you have the stator out, make sure to measure each winding and check its resistance to make sure the coils are not shorted anywhere.

Also, if you have time, take another measurement of the inductance with the rotor in so we can see if it is different from the old measurement you took.

Lastly, verify that you have the start of the winding and end of the winding labeled as such so you won't make a mistake when you hook them up.

PmgR

[d3x0r]

There's low RPM generators with neodymium magnets....

Anyone wanna do some math? 

https://www.quora.com/Are-electromagnets-stronger-than-the-same-volume-of-N52-neodymium-magnets

Permanent magnets can develop no more than 1.2T in a highly permeable magnetic circuit.
Electromagnets routinely can produce 1.5 to 2T in the same circuit, and are capable of more if driven harder and with ample cooling.

Another similar question...

B=μ0 * core permeability * N * I/ (slot height),

N=(16?20?) turns
I = ?  What is the resistance of these coils? 
to get an order of magnitude for the field. Our real field is going to be smaller.

I get ~10-3 T or 10 Gauss. So it's pretty much hopeless.. Permanent magnets are way too strong.

I think he discounted the core permeability though... and was calculating for a very small magnet, whereas these are very large coils.

----------
Having problems finding pre-compared electromagets vs neodymium magnet strength...

Although from the rough information I think probably the field strengths are approximately the same as or greater than equivalent magnets rotating instead.

[T-1000]

Interesting d3x0r

Thanks for sharing

Luc

BTW, today I took all my stator coils out and reinstalled them to a 5 slot space (pitch) instead of 6 and when I was done, now the windings look exactly like Pierre's stator.

Nice remake!

As a side note due 30 pole stator you will need workarounds due the way Pierre was driving his coils.
In his setup he had 36 coils with 5 coils spacing and 3 pole (120 degrees) switching with a group space of  6+6 coils for each pole. And 4 coils in series for single polarity.
In your case 30 / 6 = 5+5 coils per group which leave 3 coils in series for single polarity. And the 5 coils spacing need reducing to 4 coils spacing. This will result weaker poles but same arrangement.

Cheers!