Pololu
20.4:1 Metal Gearmotor 25Dx50L mm HP 12V with 48 CPR Encoder
A high-power 12V brushed DC gearmotor with a 20.4:1 metal spur gearbox and integrated 48 CPR quadrature encoder. The encoder on the motor shaft provides 979....
A high-power 12V brushed DC gearmotor with a 20.4:1 metal spur gearbox and integrated 48 CPR quadrature encoder. The encoder on the motor shaft provides 979.62 counts per revolution of the gearbox output shaft, enabling precise speed and position control for robotics applications.
The cylindrical motor body is just under 25mm in diameter, with a 4mm D-shaped output shaft extending 12.5mm from the gearbox face plate.
Key Features
- 20.4:1 Metal Gearbox – Durable metal spur gears for reliable torque transmission
- 48 CPR Quadrature Encoder – 979.62 counts per gearbox output revolution
- High-Power 12V Motor – 500 RPM no-load speed
- Compact Form Factor – ~25mm diameter cylindrical body
- D-Shaped Output Shaft – 4mm diameter, 12.5mm long
Specifications
- Voltage: 12V
- Gear Ratio: 20.4:1
- No-Load Speed: 500 RPM
- No-Load Current: 300mA
- Stall Torque: 6 kg·cm (85 oz·in)
- Stall Current: 5.6A
- Encoder Resolution: 48 CPR (979.62 CPR at output)
- Output Shaft: 4mm D-shaped, 12.5mm long
- Motor Diameter: ~25mm
Ideal For
- Robotics and autonomous vehicles
- Precision motor control with encoder feedback
- PID speed and position control projects
- Wheeled robot platforms
Package Contents
- 1× 20.4:1 Metal Gearmotor 25D×50L mm HP 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
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