just as [Fraens] has done with this 3D-printed generator. (Video, embedded below.) [Fraens] starts off with a jig for winding the individual coils, but then the jig itself snaps into a the stator ...
It’s in effect a set of coaxial transformers with a three-phase stator coil and a single-phase rotor ... a 26-volt 400-Hz AC reference voltage generator, an industrial data acquisition module ...