SparkFun
Metal Gearmotor with Encoder - 12V (9.7:1)
This 12V brushed DC gearmotor features a 9.68:1 metal spur gearbox and an integrated 48 CPR quadrature encoder on the motor shaft, providing 464.64 counts pe...
This 12V brushed DC gearmotor features a 9.68:1 metal spur gearbox and an integrated 48 CPR quadrature encoder on the motor shaft, providing 464.64 counts per revolution of the gearbox output. The two-channel Hall effect encoder senses a magnetic disk on the motor shaft, delivering speed and direction feedback for precise closed-loop control.
The motor has a cylindrical form factor just under 25mm in diameter, with a 4mm D-shaped output shaft extending 12.5mm from the gearbox face plate. Six colour-coded leads (20cm) terminate in a 1×6 female header with 0.1" pitch for easy connection.
Specifications
- Voltage: 12V
- Gear Ratio: 9.68:1
- No-Load Speed: 580 RPM
- No-Load Current: 60mA
- Stall Current: 0.9A
- Stall Torque: 1.3 kg·cm (18 oz·in) — theoretical extrapolation
- Max Power: 1.8W
- Output Shaft: 4mm D-shaft, 12.5mm length
- Motor Diameter: ~25mm (cylindrical)
- Lead Length: 20cm with 1×6 female header (0.1" pitch)
Encoder Specifications
- Type: Two-channel Hall effect quadrature encoder
- Resolution: 48 CPR (motor shaft) / 464.64 CPR (gearbox output)
- Encoder Vcc: 3.5–20V, max 10mA
- Output: Square waves (A and B channels, ~90° phase offset)
Ideal For
- Closed-loop speed and position control in robotics
- Wheeled robot drive systems with odometry
- Precision motorised mechanisms
Jargon buster
Plain-language definitions for the technical terms used above.
- closed-loop control
- Closed-loop control means the system uses feedback, such as motor position or speed, to adjust its output automatically. This matters because it can keep a motor moving accurately even when the load changes, unlike simple open-loop control.
- 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.
Find this product in
Brands
Robotics & Motion
Supplier page — sparkfun.com
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