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250:1 Metal Gearmotor 20Dx46L mm 12V CB
These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 12V brushed DC motor with long-life carbon brushes combined with a 250:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 55 RPM, 80 mA | 14 kg⋅cm (190 oz⋅in), 1.6 A |
Note: the gearbox torque limit is 70 oz-in (5 kg-cm); see detailed description for important product limitations.
Alternatives available with variations in these parameter(s): gear ratio motor type extended motor shaft? Select variant…
Compare all products in 12V Carbon Brush (CB) 20D Gearmotors.
| Description | Specs (20) | Pictures (14) | Resources (3) | FAQs (3) | On the blog (0) |
|---|
Dimensions
| Size: | 20D × 47.7L mm1 |
|---|---|
| Weight: | 47 g |
| Shaft diameter: | 4 mm2 |
General specifications
| Gear ratio: | 250:1 |
|---|---|
| No-load speed @ 12V: | 55 rpm |
| No-load current @ 12V: | 0.08 A |
| Stall current @ 12V: | 1.6 A3 |
| Stall torque @ 12V: | 14 kg·cm3 |
| Max output power @ 12V: | 2.0 W |
| No-load speed @ 6V: | 28 rpm4 |
| Stall current @ 6V: | 0.8 A4 |
| Stall torque @ 6V: | 7.0 kg·cm4 |
| Extended motor shaft?: | N |
| Long-life carbon brushes?: | Y |
| Motor type: | 1.6A stall @ 12V CB (carbon brush) |
Performance at maximum efficiency
| Max efficiency @ 12V: | 30 % |
|---|---|
| Speed at max efficiency: | 47 rpm |
| Torque at max efficiency: | 2.4 kg·cm |
| Current at max efficiency: | 0.33 A |
| Output power at max efficiency: | 1.2 W |
Notes:
- 1
- Not including output shaft; output shaft adds 18 mm to the total length.
- 2
- D shaft.
- 3
- 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.
- 4
- This motor will run at 6 V but is intended for operation at 12 V.
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