Pololu Metal Gearmotors » 25D Metal Gearmotors » 12V Medium-Power (MP) 25D mm Gearmotors »
20.4:1 Metal Gearmotor 25Dx50L mm MP 12V
This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 20.4:1 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. This gearmotor is also available with an integrated encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 380 RPM, 80 mA | 3.2 kg⋅cm (44 oz⋅in), 1.8 A |
Alternatives available with variations in these parameter(s): gear ratio motor type encoders? Select variant…
Compare all products in 12V Medium-Power (MP) 25D mm Gearmotors.
| Description | Specs (19) | Pictures (10) | Resources (3) | FAQs (3) | On the blog (0) |
|---|
Dimensions
| Size: | 25D x 50L mm1 |
|---|---|
| Weight: | 85 g |
| Shaft diameter: | 4 mm2 |
General specifications
| Gear ratio: | 20.4:1 |
|---|---|
| No-load speed @ 12V: | 380 rpm3 |
| No-load current @ 12V: | 0.080 A4 |
| Stall current @ 12V: | 1.8 A5 |
| Stall torque @ 12V: | 3.2 kg·cm5 |
| Max output power @ 12V: | 3.1 W |
| No-load speed @ 6V: | 190 rpm6 |
| Stall current @ 6V: | 0.90 A6 |
| Stall torque @ 6V: | 1.6 kg·cm6 |
| Motor type: | 12V, 1.8A stall (MP 12V) |
Performance at maximum efficiency
| Max efficiency @ 12V: | 43 % |
|---|---|
| Speed at max efficiency: | 330 rpm |
| Torque at max efficiency: | 0.43 kg·cm |
| Current at max efficiency: | 0.28 A |
| Output power at max efficiency: | 1.5 W |
General specifications
| Encoders?: | N |
|---|
Notes:
- 1
- 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.
- 2
- D shaft.
- 3
- Typical; ±20%.
- 4
- Typical, ±50%; no-load current depends on internal friction, which is affected by many factors, including ambient temperature and duration of motor operation.
- 5
- Stalling is likely to damage the gearmotor. Stall parameters come from a theoretical extrapolation of performance at loads far from stall. As the motor heats up, as happens as it approaches an actual stall, the stall torque and current decrease.
- 6
- This motor will run at 6 V but is intended for operation at 12 V.
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