N20 12V 140RPM Micro Metal Gear Motor with Encoder

A small motor built for closed-loop control

The N20 12V 140RPM micro metal gear motor pairs a compact DC motor with a durable all-metal gearbox and an integrated magnetic encoder, giving direct feedback on the motor's position and speed without needing to add a separate external sensor to the build. That encoder is the main reason to reach for this motor over a plain N20 gear motor: it enables closed-loop speed control or precise positioning in a robotics project, rather than relying purely on open-loop timing.

At its rated 12V supply, the motor's no-load speed is 140RPM, dropping to a rated speed of 110RPM under its rated load, with a rated torque of 1.2kg-cm and a stall torque of 9kg-cm. The gear ratio is 200:1, a substantial reduction that trades raw shaft speed for a large increase in torque and precision at the output shaft.

Build and mounting

Despite its output torque, the motor remains compact and lightweight, designed specifically for space-constrained applications where a larger geared motor simply would not fit. The all-metal gearbox is built to be stall-resistant and durable under continuous use, an important trait for a motor meant to be driven repeatedly in a robot that starts, stops and reverses often.

Its shaft and mounting are designed for easy wheel attachment, and the combination of small size, decent torque and a built-in encoder is aimed squarely at more advanced hobby and educational robotics builds that need genuine speed or position feedback.

Who it suits

Builders working on line-following robots, self-balancing robots or any small robotics project that needs closed-loop motor control will benefit from the built-in encoder here, compared to a plain gear motor without feedback.

Questions buyers ask

Does it include an encoder?

Yes, an integrated magnetic encoder is built into the motor.

What is the gear ratio?

200:1.

What is the stall torque?

9kg-cm.

What voltage does it run on?

12VDC rated.