DFRobot - 12V Metal DC Geared Motor with Encoder (43.8:1, 251RPM, 18Kg.cm)

This 12V metal geared motor with encoder combines reduced-speed drive and rotation feedback for mobile robot projects. The 43.8:1 gearbox provides a nominal 251RPM no-load output, while an integrated Hall quadrature encoder supplies signals for measuring shaft rotation. A 6mm D-shaped output shaft and six M3 mounting holes support integration with a suitable wheel hub, bracket or drive mechanism. Pair this motor with a controller and appropriately rated motor driver to build feedback-based motion experiments. The motor is intended for 12V operation, and the encoder requires a separate 5V supply.

43.8:1 Metal Gearbox for Robot Drive Builds

This DC geared motor uses a 43.8:1 metal gearbox to reduce motor-shaft speed for practical mechanical output. The listed nominal no-load speed is 251RPM, supporting selection for mobile robot drive prototypes. The manufacturer specifies 18 Kg.cm stall torque and 7 A stall current, which describe the stopped-shaft condition rather than a continuous working point. Choose the mechanism, driver and power supply around the intended load instead of combining no-load speed and stall torque into an operating promise.

Hall Quadrature Encoder for Rotation Feedback

This motor includes a Hall quadrature encoder specified at 16 counts per motor-shaft revolution and 700 counts per gearbox-output revolution. A controller can use the two-phase feedback to determine direction and estimate rotational speed, then apply the readings in a motion-control program. This gives a robot project access to measured rotation alongside the motor command. The encoder operates at 5 V; confirm the feedback interface and software counting convention when connecting to the host controller.

D-Shaped Output Shaft and Six M3 Mounting Points

This geared motor provides a 0.61" long, 6 mm-diameter D-shaped output shaft for coupling to suitable mechanical hardware. Six threaded M3 holes on the face plate form a regular hexagon, with neighboring hole centers spaced 15.5 mm apart. These defined mounting features help plan a bracket or chassis around the motor. Screw insertion into the motor must not exceed 3mm, because longer engagement can contact the gears; account for bracket thickness when selecting screw length.

Wiring Diagram for 12V metal geared motor & UNO

Warning: Do not screw too far into the mounting holes as the screws can hit the gears. Manufacturer recommends screwing no further than 3mm (1/8") into the screw hole.

• 12V DC motor with 43.8:1 metal gearbox
• Nominal 251RPM no-load output speed
• Integrated Hall quadrature encoder for rotation feedback
• 16CPR motor-shaft and 700CPR gearbox-output specifications
• 6mm D-shaped output shaft, 0.61" long
• Six M3 face-plate mounting holes in a regular hexagon

• Mobile robot drive prototypes
• Encoder-based rotation and speed sensing
• Feedback-based motor-control experiments
• Custom drive mechanisms with compatible shaft couplings

• Gear ratio: 43.8:1
• No-load speed: 251 + 10% RPM
• No-load current: 350 mA
• Start Voltage: 1.0 V
• Stall Torque: 18 Kg.cm
• Stall Current: 7 A
• Insulation resistance: 20 M Ω
• EncoderOperating Voltage: 5 V
• Encoder type: Hall
• Encoder Resolution: 16CPR(motor shaft)/700CPR(gearbox shaft)
• Weight: 205g

• GB37Y3530-12V-251R Gear Motor w/Encoder  x1