This compact, inexpensive plastic gearmotor ( high-power brushed DC motor with a 120:1 reduction gearbox) is well suited for use in small robots. While intended for operation at 4.5 V, it should run comfortably in the 3 V to 6 V range.
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Our Code: SKU-002646
Supplier Link: [Pololu MPN:1520]
This compact, inexpensive plastic gearmotor (high-power brushed DC motor with a 120:1 reduction gearbox) is well suited for use in small robots. While intended for operation at 4.5 V, it should run comfortably in the 3 V to 6 V range. The gearbox has a 9.7mm-long, 3 mm-diameter D-shaped output shaft that is offset from but parallel to the motor shaft, and a built-in safety clutch helps protect the gears from excessive loads. This version also has a 5×1.5 mm extended motor shaft.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 4.5 V | 150 RPM, 130 mA | 1.8 kg⋅cm (25 oz⋅in), 1.25 A |
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This brushed DC gearmotor is compact and affordable — perfect for building a quick, miniature robot. It is 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).
This gearmotor features 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 to provide motor speed or position feedback:
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The gearbox has a 3 mm diameter D-shaft output, whcih are just like the ones on our micro metal gearmotors and are compatible with many Pololu wheels and our 3 mm universal mounting hubs. It is also compatible with our 12mm hex wheel adaptor, which enables this motor to be used with many common hobby RC wheels. Wide and tall mounting brackets are also available for securely mounting these mini plastic gearmotors in different orientations.
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This item has a high-power motor (1250 mA stall current), a 120:1 gearbox, and a 3 mm diameter “D”-shaped output shaft that is offset from but parallel 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 (184k pdf) of this gearmotor for more information.
Exact gear ratio: ``(22×38×44×26×30) / (10×11×11×22×9) ~~ bb(119.76)``
120:1 mini plastic gearmotor, offset 3mm D-shaft output, extended motor shaft.
| Size: | 36.5 x 20 x 27.4 mm1 |
|---|---|
| Weight: | 19 g |
| Shaft diameter: | 3 mm2 |
| Shaft type: | offset 3mm D |
|---|---|
| Typical operating voltage: | 4.5 V |
| Gear ratio: | 120:1 |
| No-load speed @ 4.5V: | 150 rpm |
| No-load current @ 4.5V: | 130 mA |
| Stall current @ 4.5V: | 1250 mA |
| Stall torque @ 4.5V: | 25 oz·in3 |
| Encoder: | encoder-compatible (extended motor shaft) |
Dimension diagram of the mini plastic gearmotor HP with offset 3mm D-shaft output and extended motor shaft.
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