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Pololu 1515 - 120:1 Mini Plastic Gearmotor, 90° 3mm D-Shaft Output, Extended Motor Shaft
ID: 561579
This compact, inexpensive plastic gearmotor (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.
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).
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.
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.
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.
561579
Data sheet
- DC motor power
- Other
- Gear material
- Plastic
- Gear ratio
- 120:1
- Rotation speed
- 120RPM
- Shaft diameter
- 3 mm
- Shaft shape
- D
- Obustronny wał silnika
- Tak
- Power supply voltage
- 4.5V
Manufacturer BTC Korporacja sp. z o. o. Lwowska 5 05-120 Legionowo Poland sprzedaz@kamami.pl 22 767 36 20
Responsible person BTC Korporacja sp. z o. o. Lwowska 5 05-120 Legionowo Poland sprzedaz@kamami.pl 22 767 36 20
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This compact, inexpensive plastic gearmotor (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.