[woodcote]

This is one of the little HO Mabuchi cans taken apart - can/magnets, armature and end bell (with the brushes)...

       

I have a couple of these for the very occasional STEM sessions we've been asked to do.

The green wound armature in that can is not a legal Micro Scalextric one. Here it is side-by-side with a dirty old Micro armature showing the 'fly wheel'...

       

And then two more cans side-by-side - one from a Tomy Turbo chassis and the other from a Micro Scalextric car...

   

They are almost identical - apart from the armature.

Your chassis looks pretty new and clean