Pololu
99:1 Metal Gearmotor 25Dx54L mm MP 12V with 48 CPR Encoder
A medium-power 12V brushed DC gearmotor with a 98.78:1 metal spur gearbox and an integrated 48 CPR quadrature encoder on the motor shaft. The encoder provide...
A medium-power 12V brushed DC gearmotor with a 98.78:1 metal spur gearbox and an integrated 48 CPR quadrature encoder on the motor shaft. The encoder provides 4741.44 counts per revolution of the gearbox output shaft, enabling precise closed-loop speed and position control.
The cylindrical motor body measures just under 25mm in diameter, and the D-shaped output shaft is 4mm in diameter, extending 12.5mm from the gearbox face plate.
Specifications
- Gear Ratio – 98.78:1
- Voltage – 12V
- No-Load Speed – 76 RPM
- No-Load Current – 200mA
- Stall Torque – 12 kg·cm (165 oz·in)
- Stall Current – 2.1A
- Encoder – 48 CPR quadrature (4741.44 counts/rev at output)
- Motor Diameter – ~25mm
- Output Shaft – 4mm D-shaped, 12.5mm length
- Gearbox – Metal spur gears
- Dimensions – 25D × 54L mm
Also Available
- 99:1 Metal Gearmotor 25D×54L HP 6V – High-power 6V variant without encoder
- 99:1 Metal Gearmotor 25D×54L LP 6V – Low-power 6V variant without encoder
Ideal For
- Closed-loop robotics requiring precise speed/position control
- Motorised mechanisms with encoder feedback
- 12V robotic drive systems
Package Contents
- 1× 99:1 Metal Gearmotor 25D×54L 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.
- 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.
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Brands
Robotics & Motion
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