You know what comes to mind, is that Croatian guy/company Cromotor, dont they just buy generic motors then upgrade them either in house or by some other means.
I have looked at people making their own motor, and it really doesnt seem that hard if you have all the tools. I will try to find that youtube video, they look to be Ukrainian or Russian. Awesome video. Ah my memory serves me.
Its not this https://www.youtube.com/watch?v=2LNfDI3QUpQ
This is it Ukraine - https://www.youtube.com/watch?v=TKjZgAvZAwM
Its like a 4 or 5 part series, this is 2 - https://www.youtube.com/watch?v=0kOMIuP75WU
I have always been fascinated with how this guy built his. Simple process.
I would say if someone has a lathe, and a little experience, why not do up a prototype.
I believe Cromotor just used QS205 motors, I believe they were using V1s, they then milled out some of the metal to lighten it, and rewound with thicker copper. That said, if you want to see some more custom motors, look at iulian207, he made, from scratch, a 45kW BLDC inrunner, and a 35kW BLDC outrunner. I believe he owns his own company that does it, or works in a machine shop of some sort. https://www.youtube.com/channel/UCKWHbU ... DsFZlZWLMw
That said, there are so many different things that can be attempted to make the best motor you need.
1. Different soft magnetic materials for the stator laminations, in various thicknesses.
2. Multi-material stator laminations.
3. Powdered core for the stator, as each powder particulate is insulated via the bonding agent. Makes me wonder if a powdered core could handle the torque, or if it would just crack and/or disintegrate, lol. This might be able to be 3d printed for your prototype, then stamped for larger runs. Powdered cobalt-iron alloy stator?
4. Different strength magnets.
5. Different materials for the magnets (neodymium vs samarium-cobalt).
6. Different temperature ratings for the magnets.
7. Differently shaped magnets and stator poles.
8. Different numbers of poles, and thus different windings and wire gauges.
9. Different structural materials.
10. Different structure design.
11. Mechanical components like bearings, go ceramic? For the axle, steel? aluminum? titanium?
Oh, to have won the lottery and be able to experiment!