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20.4:1 Metal Gearmotor 25Dx65L mm LP 12V with 48 CPR Encoder
This gearmotor consists of a low-power, 12 V brushed DC motor combined with a 20.4:1 metal spur gearbox, and it has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 979.62 counts per revolution of the gearbox’s output shaft. 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 without an encoder.
voltage | no-load performance | stall extrapolation |
---|---|---|
12 V | 260 RPM, 100 mA | 2 kg⋅cm (29 oz⋅in), 1.1 A |
In general, these kinds of motors can run at voltages above and below their nominal voltages (they can begin rotating at voltages as low as 1 V); lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor.
These gearmotors are functionally identical to the previous versions we carried without end caps (they use the same motor, encoder, and gearboxes). The black plastic end cap is easily removable if you need to access the encoder or want to slightly reduce the overall gearmotor size, but there is a little bit of base plastic that will remain, as shown in the picture below:
Dimensions
The diagram below shows the dimensions of the 25D mm line of gearmotors (units are mm over [inches]). This diagram is also available as a downloadable PDF (171k pdf).
Dimensions of the Pololu 25D mm metal gearmotors with encoders. Units are mm over [inches]. |
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Dimensions
Size: | 25D x 65L mm1 |
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Weight: | 98 g |
Shaft diameter: | 4 mm |
General specifications
Gear ratio: | 20.4:1 |
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No-load speed @ 12V: | 260 rpm |
No-load current @ 12V: | 100 mA |
Stall current @ 12V: | 1100 mA |
Stall torque @ 12V: | 29 oz·in |
No-load speed @ 6V: | 130 rpm2 |
Stall current @ 6V: | 550 mA2 |
Stall torque @ 6V: | 14 oz·in2 |
Motor type: | 1.1A stall @ 12V (LP 12V) |
Lead length: | 8 in3 |
Encoders?: | Y |