High-Torque 12V 37D Gearmotor + Encoder (30:1) for Precise Robot Motion

ThIis is a powerful 12V brushed DC gearmotor built around a rugged 37D metal gearbox (30:1) and an integrated quadrature encoder for accurate speed + direction feedback. It’s a solid upgrade for robots that need reliable torque and clean odometry—perfect for wheeled platforms, automation sliders, and closed-loop motor control.

PH note: Circuitrocks ships nationwide in the Philippines. If you’re building a robot and need help matching a driver + wheel hub, message us and we’ll point you to compatible add-ons.

Why you’ll like it

Strong torque from a durable metal gearbox, sized for real robot loads—without going bulky.

Integrated quadrature encoder gives accurate feedback; helical pinion gears help reduce noise and improve efficiency.

Technical specifications

Model	Pololu 30:1 Metal Gearmotor 37D × 68L mm, 12V, with 64 CPR Encoder (Helical Pinion)
Nominal voltage	12V
Gear ratio	30:1 (exact ratio listed by Pololu as 30:1)
No-load (12V)	330 RPM, 200 mA
Stall (12V)	14 kg·cm (190 oz·in), 5.5 A
Encoder	Quadrature encoder, 64 CPR (motor shaft) = 1920 counts per gearbox output revolution
Output shaft	6 mm diameter, D-shaft
Form factor	37D × 68L mm gearmotor body

Pinout & power notes

Motor leads: connect to a brushed DC motor driver (H-bridge). Do not drive directly from a microcontroller pin.
Encoder output: quadrature A/B signals (plus encoder power/ground on the encoder board). Use interrupt-capable pins when possible for best counting accuracy.
Current headroom: design around stall current ~5.5A. Choose a driver and power source with safe overhead.
Noise tip: keep encoder wires away from motor power wires when possible; twisting pairs and adding basic filtering can help in noisy builds.

FAQ

How accurate is the encoder at the output shaft?
The encoder is 64 CPR on the motor shaft, which becomes 1920 counts per revolution at the gearbox output (30:1).
Can I run it at 6V?
It can spin at lower voltages, but performance will drop. For best results (and the published specs), use 12V.
What motor driver should I use?
Pick a brushed DC H-bridge rated for the motor’s current (plan around stall). Check our motor drivers collection.
What wheels/hubs fit?
The output shaft is a 6mm D-shaft. Look for 6mm D-shaft hubs/adapters or wheel adapters.

30:1 Metal Gearmotor 37Dx68L mm 12V with 64 CPR Encoder

Name: 30:1 Metal Gearmotor 37Dx68L mm 12V with 64 CPR Encoder
Brand: circuitrocks
SKU: POL4752
Price: 5298.0 PHP
Availability: InStock