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Description

These small brushed Pololu?20D DC gearmotors can deliver a lot of power for their size. This version has a?6V?brushed DC motor with?long-life carbon brushes?combined with a 100:1?metal spur gearbox. The gearmotor is cylindrical with a diameter of 20mm, and the D-shaped output shaft is 4mm in diameter and extends 18mm from the faceplate of the gearbox.

We also stock 25:1 and 250:1 versions of this motor.

In general, these kinds of motors can run at voltages above and below their nominal voltages; lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor.

Note:?Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. In order to avoid damaging the gearbox, we recommend keeping continuously applied loads under 5 kg-cm (75 oz-in). Stalls can also result in rapid (potentially on the order of seconds) thermal damage to the motor windings and brushes, especially for motors like this that can deliver a lot of power for their size; a general recommendation for brushed DC motors is to limit continuous current to approximately 25% of the stall current.

Specifications

Voltage	6V
Gear ratio	100:1
No-load speed @ 6V	140 rpm
No-load current @ 6V	0.15A
Stall current @ 6V	2.9 A
Stall torque @ 6V	5.4 kg??cm
Max output power @ 6V	2.0W
Extended motor shaft?	N
Long-life carbon brushes?	Y
Motor type	2.9A stall @ 6V CB (carbon brush)
Size	20D ?? 46.2L mm
Weight	46g
Shaft diameter	4mm

Performance at Maximum Efficiency

Max efficiency @ 6V	30%
Speed at max efficiency	120 rpm
Torque at max efficiency	0.10 kg??cm
Current at max efficiency	0.63A
Output power at max efficiency	1.1 W

Resources

• Datasheet for Pololu 20D Metal gearmotors
• Dimension Diagrams for Pololu 20D Metal gearmotors
• 3D Models of Pololu 20D Gearmotors

Dimensions

The downloadable diagram shows the dimensions of the 20Dmm line of metal gearmotors (units are mm over [inches]).

Warning:?Do not screw too far into the mounting holes as the screws can hit the gears. We recommend screwing no more than 3.5?mm (0.14??) into the M2.5 mounting holes.

Gearmotor accessories

• Gearmotor Face Plate – The gearmotor face plate has two mounting holes threaded for M2.5 screws, and you can use our custom-designed?20D?mm metal gearmotor bracket to mount the gearmotor to your project via these mounting holes and the screws that come with the bracket.

• Universal Mounting Hubs – The 4mm diameter gearbox output shaft works with?Pololu universal aluminum mounting hub for 4mm shafts, which can be used to mount our larger?Pololu wheels?(60mm-, 70mm-, 80mm-, and 90mm-diameter) or custom wheels and mechanisms to the gearmotor??s output shaft.

• Scooter Wheel Adaptors – You can use our?4mm scooter wheel adapters?to mount many common skateboard, inline skate or scooter wheels to the gearmotor??s output shaft.

• 12mm Hex Wheel Adapter – For a general-purpose hex adapter, consider our?12mm hex wheel adapter, which lets you use this motor with many common hobby RC wheels.

• Wild Thumper Wheels – These motors also work with the hex adapters included with the 120mm-diameter?Wild Thumper wheels