Pololu
227:1 Metal Gearmotor 25Dx56L mm MP 12V with 48 CPR Encoder
This medium-power 12V brushed DC gearmotor features a 226.76:1 metal spur gearbox and an integrated 48 CPR quadrature encoder on the motor shaft, providing 1...
This medium-power 12V brushed DC gearmotor features a 226.76:1 metal spur gearbox and an integrated 48 CPR quadrature encoder on the motor shaft, providing 10,884.47 counts per revolution of the gearbox output shaft for precise position and speed feedback.
The gearmotor has a cylindrical form factor with a diameter just under 25mm. The D-shaped output shaft is 4mm in diameter and extends 12.5mm from the gearbox face plate.
Key Features
- 226.76:1 Metal Gearbox – High gear ratio for strong torque output
- 48 CPR Quadrature Encoder – 10,884.47 counts per revolution of output shaft
- Medium-Power 12V Motor – Brushed DC motor with reliable performance
- Metal Spur Gears – Durable construction for demanding applications
- D-Shaped Output Shaft – 4mm diameter, 12.5mm extension for secure mounting
Specifications
- Voltage: 12V
- Gear Ratio: 226.76:1
- No-Load Speed: 33 RPM
- No-Load Current: 200mA
- Stall Torque: 23 kg·cm (320 oz·in)
- Stall Current: 2.1A
- Encoder Resolution: 48 CPR (motor shaft)
- Diameter: ~25mm
- Output Shaft: 4mm D-shaped, 12.5mm long
Ideal For
- Robotics and mobile platforms
- Precision position control systems
- Motorised mechanisms requiring encoder feedback
- PID-controlled drive systems
Package Contents
- 1× 227:1 Metal Gearmotor 25Dx56L mm MP 12V with 48 CPR Encoder
Jargon buster
Plain-language definitions for the technical terms used above.
- encoder
- A device attached to a motor or shaft that reports movement, such as rotation steps or position. In a pump system, an encoder can help measure or control how much the motor has turned, which affects how repeatable the watering amount can be.
- kg·cm
- A torque unit often used for hobby servos, meaning how many kilograms of force the servo can hold at a 1 cm arm length. A higher kg·cm rating means the servo can move or hold heavier loads, but power supply current needs may also increase.
- Stall torque
- The maximum twisting force a servo can produce when its output is held still and cannot move. It helps you judge whether the servo is strong enough for a robot joint, steering linkage, or other load.
- Torque
- A twisting force that causes something to rotate, usually measured in newton-metres or kilogram-centimetres. It matters when choosing motors, servos, gears, and tools because higher torque is needed to lift heavier loads, turn larger wheels, or move mechanisms without stalling.
Find this product in
Robotics & Motion
Related Tutorials
Free guides on learn.littlebird.com.au
