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125:1 Metal Gearmotor 20Dx44L mm 12V CB with Extended Motor Shaft
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 125:1 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. This version also has a 6 × 2 mm extended motor shaft.
voltage | no-load performance | stall extrapolation |
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12 V | 110 RPM, 80 mA | 7.8 kg⋅cm (110 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 (1) | On the blog (0) |
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Dimensions
Size: | 20D × 46.2L mm1 |
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Weight: | 46 g |
Shaft diameter: | 4 mm2 |
General specifications
Gear ratio: | 125:1 |
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No-load speed @ 12V: | 110 rpm |
No-load current @ 12V: | 0.08 A |
Stall current @ 12V: | 1.6 A3 |
Stall torque @ 12V: | 7.8 kg·cm3 |
Max output power @ 12V: | 2.2 W |
No-load speed @ 6V: | 55 rpm4 |
Stall current @ 6V: | 0.8 A4 |
Stall torque @ 6V: | 3.9 kg·cm4 |
Extended motor shaft?: | Y |
Long-life carbon brushes?: | Y |
Motor type: | 1.6A stall @ 12V CB (carbon brush) |
Performance at maximum efficiency
Max efficiency @ 12V: | 33 % |
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Speed at max efficiency: | 94 rpm |
Torque at max efficiency: | 1.3 kg·cm |
Current at max efficiency: | 0.31 A |
Output power at max efficiency: | 1.2 W |
Notes:
- 1
- Not including output shafts; output shafts add 24 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.