Bad news.
I rewound it today. 2 coils the same. Each straight to the opposite slot. Right next to each other. They crossed each other. Don't even attempt this if someone is going to start taking.
The plan was for 3. I ran out of space at the top and bottom. The plan was if I got 12v in each coil, I could split them. If not, then series.
I removed the stock magnets, a big job. Chips stuck everywhere. The last 10% was ground out with ViceGrip teeth. The BFH deformed the ring. Took 2 hours.
Installed 2 neos in the right places. 1x 1/2x 1/4". Covered the slot span about right, but could have been a little wider. The air gap was nice, about 1/16".
Was aiming for 100~120 turns per coil. Only 83 fit. Could have maybe got 100 with a lot more time and effort. Put them in series. Both ends went to 2 adjoining brushes, so just in case the magnets were a tad off the power would still have a place to get out. Super glued them into the armature, they wanted out bad!
Two and a half hours to get it back together! Drilled a hole behind each brush. Tied them back with dental floss, knot outside, over tooth picks. Way harder than it sounds, just tying them back.
The bearing twisted every time because the armature was skewed from the magnets. The contacts pushed the floss off the brushes. The magnet ring was out of round from the BFH, so it needed twisting to get it started, which skewed the bearing and pushed the floss down. The magnet ring still had teeny tiny chips of the stock magnets I couldn't get off, and that did not help.
So, 166 turns, 1 ohm per coil, 2 ohms total, single phase, 650RPM.
And 3.0v open, 150ma short circuit. Needed a capacitor between the outputs.
It did better than that stock! (3.9v)
I believe it would be much better in the stock coil configuration and with the stock magnets (unless someone wants to spend a ton for neos to cover the same space).
I believe it would have been much better to have a armature with 12 slots allowing for 4 magnets 90 degrees apart, for 2 perpendicular coils of double the turns, for a single phase rewind like I was going after. Or 16 or 20, or some number of slots divisible by 4. Maybe by 6 for 6 magnets and 3 coils.
A 3 phase may be OK, if the slots allow for it. Rectified inside the can, a pile of epoxy to hold everything in place.
If I was going to put myself through this again, I would rewind it in the STOCK configuration. I would not even try to salvage the wire. The whole point would be to accurately map how it was in there, to what contact, and where it went from there and in what order.
For the specs you have from you motor, I would guess you need 70 turns for 12v at 700 rpm and the stock wiring configuration.
I would try for 120 turns per coil for a cut in around 400rpms. I would not worry about the wire being too small for the amps. I would worry about not enough space for the wire, not just in the slots, but at the ends! I would say 150 turns would be better.
Remember that tiny wire from some transformer long ago? You need that now. And a lot of feet of it!
Sounds like a job for a motor shop. I may call them tommorow to see what it would cost. I still have one left that has never been open.
Good luck!
G-