Overview

These brushed DC gearmotors are compact and affordable — perfect for building a quick, miniature robot. They are intended for use at 4.5 V, though in general, these kinds of motors can run at voltages above and below this nominal voltage, so they should operate comfortably in the 3 V to 6 V range (rotation can start at voltages as low as 0.5 V). Lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor. The plastic gearbox is protected by a built-in safety clutch that will typically slip before the gear teeth can shear (typically when the load exceeds around 25 oz-in, or 2 kg-cm).

The mini plastic gearmotor family offers two output shaft orientations relative to the motor shaft (offset and 90°), two motor options (normal and high-power, or HP for short), and two gearbox options (120:1 and 180:1). The 120:1 versions are white and the 180:1 versions are yellow:

180:1 mini plastic gearmotor offset 3mm D-shaft output.

120:1 mini plastic gearmotor, 90-degree 3mm D-shaft output, extended motor shaft.

Some versions of these gearmotors are also available with an additional 1.5 mm-diameter output shaft that protrudes from the rear of the motor. This 5 mm-long rear shaft rotates at the same speed as the input to the gearbox and offers a way to add an encoder, such as our magnetic encoder for mini plastic gearmotors, to provide motor speed or position feedback:

Magnetic Encoder Kit for Mini Plastic Gearmotors assembled on mini plastic gearmotors with extended motor shafts.

Please see the mini plastic gearmotor comparison table for detailed specifications of all our mini plastic gearmotors. This dynamically-sortable table can help you find the gearmotor that offers the best blend of speed, torque, and current-draw for your particular application. A more basic comparison table is available below:


Motor Type Stall
Current
@ 4.5 V
No-Load
Speed
@ 4.5 V
Stall Torque
@ 4.5 V


90° output


90° output + motor shaft


offset output


offset output + motor shaft
high-power
(HP)
1250 mA 150 RPM 25 oz-in 120:1 mini HP 120:1 mini HP 120:1 mini HP 120:1 mini HP
low-power 800 mA 120 RPM 20 oz-in 120:1 mini 120:1 mini 120:1 mini 120:1 mini
80 RPM 30 oz-in 180:1 mini 180:1 mini

Note: The stall torque values listed are approximate, and the built-in safety clutch might start slipping at lower torques.

The gearmotors in the table above all have a 3 mm diameter D-shaft output. These shafts are just like the ones on our micro metal gearmotors and are compatible with many Pololu wheels and our 3 mm universal mounting hubs. We also carry two low-power, 120:1 mini plastic gearmotors with 2 mm diameter spline outputs: 90° 2mm spline output and offset 2mm spline output. These gearmotors all work with our wide and tall mounting brackets for mini plastic gearmotors.

Details for item #1515

This item has a low-power motor (800 mA stall current), a 120:1 gearbox, and a 3 mm diameter “D”-shaped output shaft that is perpendicular to the motor shaft. The 1.5 mm diameter motor shaft extends approximately 5 mm past the base of the motor. See the dimension diagram (70k pdf) of this gearmotor for more information.

Motor Accessories

Mini plastic gearmotor 90-degree 3mm D-shaft output with Pololu 90×10mm wheel.

Mini plastic gearmotor offset 3mm D-shaft output with Pololu wheel.

Mini plastic gearmotor 90-degree 3mm D-shaft output with Pololu 32×7mm wheel.

  • Mounting brackets: Our wide and tall mounting brackets are specifically designed to securely mount these mini plastic gearmotors. Both brackets work with both offset and 90° gearmotor versions, and the two brackets each allow for different mounting options.

60×8mm Pololu wheel and 90° mini plastic gearmotor mounted with tall mini plastic gearmotor bracket (with spacer).

60×8mm Pololu wheel and offset mini plastic gearmotor mounted with a tall mini plastic gearmotor bracket (with spacer).

80×10mm Pololu wheel and offset mini plastic gearmotor mounted with a wide mini plastic gearmotor bracket.

The Magnetic Encoder Kit for Mini Plastic Gearmotors works with our Tall (left) and Wide (right) Mini Plastic Gearmotor Brackets.

Pololu qik 2s9v1 dual serial motor controller (older version with large silver electrolytic capacitor).

Baby Orangutan B-48/B-168/B-328.

DRV8835 dual motor driver carrier.

The 120:1 gear ratio versions have white plastic bodies and the 180:1 gear ratio versions have yellow plastic bodies (see the main product picture).


Specifications

Dimensions

Size: 54.5 x 20 x 13.8 mm1
Weight: 19.5 g
Shaft diameter: 3 mm

General specifications

Shaft type: 90° 3mm D
Typical operating voltage: 4.5 V
Gear ratio: 120:1
Free-run speed @ 4.5V: 120 rpm
Free-run current @ 4.5V: 80 mA
Stall current @ 4.5V: 800 mA
Stall torque @ 4.5V: 20 oz·in2
Extended motor shaft?: Y

Notes:

1
See drawing for detailed dimensions.
2
Note: the gearbox's built-in clutch might start slipping at a lower torque.

Resources

File downloads

dimension diagram: 90° 3mm D-shaft version (75k pdf)
Dimension diagram of the mini plastic gearmotor with 90° 3mm D-shaft output.
dimension diagram: 90° 3mm D-shaft and extended motor shaft version (70k pdf)
Dimension diagram of the mini plastic gearmotor with 90° 3mm D-shaft output and extended motor shaft.
dimension diagram: 90° 3mm D-shaft and extended motor shaft version HP (70k pdf)
Dimension diagram of the mini plastic gearmotor HP with 90° 3mm D-shaft output and extended motor shaft.
dimension diagram: offset 3mm D-shaft version (77k pdf)
Dimension diagram of the mini plastic gearmotor with offset 3mm D-shaft output.
dimension diagram: offset 3mm D-shaft and extended motor shaft version (69k pdf)
Dimension diagram of the mini plastic gearmotor with offset 3mm D-shaft output and extended motor shaft.
dimension diagram: offset 3mm D-shaft and extended motor shaft version HP (69k pdf)
Dimension diagram of the mini plastic gearmotor HP with offset 3mm D-shaft output and extended motor shaft.

(PL-1515)

SKU PL-1515
Brand Pololu

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