This one is aimed at your thinking cap.

I know we have mused over the star delta options but ....
Can you fuse some braincells on the topic of the number of poles and switching poles options with 3PIMs ?
As we know 2 pole 3000RPM 50Hz xNm
4 pole 1500RPM 50Hz 2xNm
6 pole 1000RPM 50Hz 3xNm
8 pole 750RPM etc.etc. up to hub motors 24 pole
What are the options (and real differences inside) with a 2pole that can be switched to 4 pole etc.
Seems there is little? difference in the rotor and the iron of the stator, just the windings placed for two or 4 efffective poles. Is this so ?
There are 2 speed motors on the market but they have poor torque/kg. Is this just because they are DOL and that a VFD could make more use of the winding assortment ?
I can picture a 4 pole's windings being arranged to look like a psuedo 2 pole.
When you have that sorted out, can I have my 4 pole modified to a 2pole / 4pole / 8pole please ?
