Pololu
6.3:1 Metal Gearmotor 37Dx65L mm 24V with 64 CPR Encoder (Helical Pinion)
A powerful 24V brushed DC gearmotor with a 6.25:1 metal gearbox and integrated 64 CPR quadrature encoder. The gearbox uses helical gears on the first stage f...
A powerful 24V brushed DC gearmotor with a 6.25:1 metal gearbox and integrated 64 CPR quadrature encoder. The gearbox uses helical gears on the first stage for reduced noise and improved efficiency, with spur gears for the remaining stages.
The integrated Hall effect encoder provides 400 counts per revolution of the gearbox output shaft, enabling precise speed and position control. The 37D series form factor features a 6mm D-shaped output shaft and standardised mounting holes.
Key Features
- Helical First Stage – Quieter operation and improved efficiency compared to all-spur designs
- Integrated Encoder – 64 CPR Hall effect quadrature encoder (400 CPR at output shaft)
- High Speed – 1600 RPM no-load speed at 24V with the 6.25:1 ratio
- Metal Gearbox – Durable metal gears for long service life
- D-Shaped Output Shaft – 6mm diameter, 16mm long for secure hub attachment
Specifications
- Gear Ratio – 6.25:1
- Operating Voltage – 24V DC
- No-Load Speed – 1600 RPM
- No-Load Current – 100mA
- Stall Torque – 3.5 kg·cm (49 oz·in)
- Stall Current – 3A
- Encoder Resolution – 64 CPR (motor shaft) / 400 CPR (output shaft)
- Encoder Supply Voltage – 3.5–20V
- Output Shaft – 6mm diameter × 16mm long, D-shaped
- Motor Dimensions – 37mm diameter × 65mm length
- Mounting Holes – 6 holes in hexagonal pattern, 15.5mm centre spacing
Ideal For
- Robotics platforms requiring high-speed drive
- Closed-loop motor control projects
- Motorised mechanisms needing precise position feedback
Package Contents
- 1× 6.3:1 Metal Gearmotor 37Dx65L mm 24V with 64 CPR Encoder (Helical Pinion)
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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Robotics & Motion
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