Brushed DC motor electric generator

In fact, in a brushed electric motor, no conversion needs to be done. Just spin the shaft and it generates DC voltage/current. All you need is speed.

VIDEO : https://youtu.be/0PG55ZWxkSI

It might come as a surprise to some readers, but there is absolutely no need for any conversion, for while many DC motors are operating as motors, THEY ARE AT THE VERY SAME TIME ACTING AS GENERATORS while their conductors in their armatures are cutting the magnetic field. This is all explained by the relations Force = BI(length) while Volts = Bl(velocity) which are both occurring at the same time in any DC motor.
A flywheel just stores energy. The energy stored is transfered to the DC motor. The dc motor s acting like an electric generator and powers up the led panel.

Dc electric motor : ( C9050-6003 KD341506 "product of china")

Using this simple system you can test diferent brushed DC motors