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125:1 Metal Gearmotor 20Dx44L mm 12V CB

Pololu item #: 3479
Brand: Pololu supply outlook
Status: Active and Preferred 
RoHS 3 compliant


Price break Unit price (US$)
1 28.95
5 26.63
25 24.50
100 22.54


backorders allowed

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.

Key specifications:

voltage no-load performance stall extrapolation
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…

 Description Specs (20) Pictures (14) Resources (3) FAQs (3) On the blog (0) 

Dimensions

Size: 20D × 46.2L mm1
Weight: 46 g
Shaft diameter: 4 mm2

General specifications

Gear ratio: 125:1
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?: N
Long-life carbon brushes?: Y
Motor type: 1.6A stall @ 12V CB (carbon brush)

Performance at maximum efficiency

Max efficiency @ 12V: 33 %
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 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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Related Categories

12V Carbon Brush (CB) 20D Gearmotors
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