Worked on a CAD!

This is a dynamo, for backdriving a DC motor to produce a voltage across both ends. The purpose, ultimately, is to be able to convert it into a stable 5V at enough amps to charge a phone.

First we’d have to get the motor spinning though, at about 8300 RPM / 60 = 138 RPS. I thought about using a gear train to backdrive it but there seems to be too much friction, so I’m using a wheel and rubber band system.

The ratio is about 6:1 *8:1, for a total of 48:1. So hopefully brisk spins would work? Otherwise, we would just need one really big sprocket.