This gearmotor consists of a low-power, 12 V brushed DC motor combined with a 377.93:1 metal spur gearbox. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 14 RPM, 100 mA | 23 kg⋅cm (320 oz⋅in), 1.1 A |
These cylindrical brushed DC gearmotors are available in a wide range of gear ratios and with five different motors (two power levels of 6 V motors and three power levels of 12 V motors). The gearmotors all have the same 25 mm diameter case and 4 mm diameter gearbox output shaft, so it is generally easy to swap one version for another if your design requirements change (though the length of the gearbox tends to increase with the gear ratio). Each version is also optionally available with an integrated 48 CPR quadrature encoder.
Dimensions
| Size: | 25D x 58L mm1 |
|---|---|
| Weight: | 96 g |
| Shaft diameter: | 4 mm |
General specifications
| Gear ratio: | 377.93:1 |
|---|---|
| No-load speed @ 12V: | 14 rpm |
| No-load current @ 12V: | 100 mA2 |
| Stall current @ 12V: | 1100 mA |
| Stall torque @ 12V: | 320 oz·in3 |
| No-load speed @ 6V: | 7 rpm4 |
| Stall current @ 6V: | 550 mA4 |
| Stall torque @ 6V: | 160 oz·in4 |
| Motor type: | 1.1A stall @ 12V (LP 12V) |
| Encoders?: | N |
Notes:
- Length measurement is from gearbox face plate to back of motor (it does not include the output shaft or motor terminals). See dimension diagram for details.
- Maximum.
- This is a theoretical value; stalling the gearbox output shaft is likely to damage the gearbox.
- This motor will run at 6 V but is intended for operation at 12 V.
File downloads
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Dimension diagram of the Pololu 25D Metal Gearmotors (171k pdf)
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3D models of 25D mm gearmotors (9MB zip)
This file contains 3D models (in the step file format) of the 25D mm gearmotors with and without encoders.
Recommended links
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MATLAB script to plot motor performance curves for Pololu brushed DC gearmotors
This MATLAB script, written by Ali Asgher Mansoor Habiby, plots speed, power, current draw, and efficiency as they vary with torque when you input the gearmotor specifications. It also prints the resistance of the motor, and the current draw and torque at which maximum efficiency and maximum power occur.