Minimalist motor

[mklotz]

I'm guessing that you removed some insulation at certain degrees from each end of the coil wire that rides in the powered supports, or maybe all of the insulation from one end and some strips from the other end.

It could be a totally wrong observation. Either way or neither way, that's a neat little demonstration.

Absolutely correct. Congratulations.

One of the "axle" wires has all its insulation removed. On the other axle wire the insulation is scraped off on only one side. Thus, as the coil spins, it receives pulses of current when the bare side of the wire comes in contact with the supports.