Pimoroni
Micro Metal Gearmotor (Extended back shaft) - 20:1
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A miniature brushed DC motor with a 20:1 metal gearbox and an extended back shaft for mounting optical encoders. All micro metal gearmotors share the same ph...
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A miniature brushed DC motor with a 20:1 metal gearbox and an extended back shaft for mounting optical encoders. All micro metal gearmotors share the same physical dimensions, so different gear ratios can be easily swapped without changing your mechanical design.
Key Features
- 20:1 Metal Gearbox – Balanced speed and torque for general-purpose applications
- Extended Back Shaft – 4.5mm long, 1mm diameter rear shaft for optical encoder mounting
- D-Shaped Output Shaft – 9mm long, 3mm diameter metal shaft
- Compact Form Factor – Standard micro metal gearmotor dimensions, interchangeable with other ratios
Specifications (20:1 @ 6V)
- Speed: 1050 ±10% RPM
- Free-Run Current: 90mA (180mA max)
- Stall Torque: 0.26 kg·cm
- Stall Current: 850mA
- Output Shaft: 9mm long, 3mm diameter, D-shaped
- Back Shaft: 4.5mm long, 1mm diameter
Ideal For
- Small robotics and mobile platforms
- Projects requiring speed feedback via optical encoders
- Compact mechanisms needing moderate speed and torque
Resources
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.
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