N20 Micro Metal Gear Motor 12V 120RPM with Encoder

A plain DC gear motor tells a controller nothing about how fast or how far it has actually turned - only how much power was applied. This N20 motor solves that by pairing its all-metal gearbox with a built-in encoder, giving real feedback on shaft rotation that makes genuine closed-loop speed control and position tracking possible, rather than open-loop guesswork based on applied voltage and elapsed time alone.

Rated for 12V operation at a no-load speed of 129RPM and a rated speed of 100RPM under load, it delivers a substantial 16kg-cm of stall torque for its size - enough to climb modest inclines or push through real mechanical resistance rather than stalling under light load. The compact N20 form factor and D-shaft output are a de facto standard in small robotics, so wheel hubs, couplers, and mounting brackets already designed for N20 motors fit without custom adaptation.

Common uses are small wheeled robots needing accurate speed control via encoder feedback (line followers, maze solvers, balancing robots), precision positioning mechanisms in compact builds, and any small robotics project where open-loop DC motor control isn't precise enough.