47:1 Metal Gearmotor 25Dx52L mm LP 12V
Overview
These cylindrical brushed DC gearmotors are available in a wide range of gear ratios and with five different motors (two power levels of 6V motors and three power levels of 12V motors). The gearmotors all have the same 25 mm diameter case and 4 mm diameter gearbox output shaft, so it is generally easy to swap one version for another if your design requirements change (though the length of the gearbox tends to increase with the gear ratio). All versions are also available with an integrated 48 CPR quadrature encoder on the motor shaft. Please see the 25D metal gearmotor comparison table for detailed specifications of all our 25D metal gearmotors. This dynamically-sortable table can help you find the gearmotor that offers the best blend of speed, torque, and current-draw for your particular application. A more basic comparison table is available below:
Note: Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. For these gearboxes, the recommended upper limit for instantaneous torque is 200 oz-in (15 kg-cm); we strongly advise keeping applied loads well under this limit. Stalls can also result in rapid (potentially on the order of a second) thermal damage to the motor windings and brushes, especially for the versions that use high-power (HP) motors; a general recommendation for brushed DC motor operation is 25% or less of the stall current.
In general, these kinds of motors can run at voltages above and below their nominal voltages; lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor.
Details
Exact gear ratio: 22×22×22×22×2412×10×10×10×10≈46.85:122×22×22×22×2412×10×10×10×10≈46.85:1
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 (223k pdf).
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Dimensions of the Pololu 25D mm metal gearmotors. Units are mm over [inches].
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Warning: Do not screw too far into the mounting holes as the screws can hit the gears. We recommend screwing no further than 2mm (0.08″) into the screw hole.
Gearmotor accessories
The face plate has two mounting holes threaded for M3 screws. You can use our custom-designed 25D mm metal gearmotor bracket(shown in the picture below) to mount the gearmotor to your project via these mounting holes and the screws that come with the bracket.
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Pololu 25D mm metal gearmotor bracket pair.
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Pololu 25D mm gearmotor with bracket.
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The 4 mm diameter gearbox output shaft works with Pololu universal aluminum mounting hub for 4mm shafts, which can be used to mount our larger Pololu wheels (60mm-, 70mm-, 80mm-, and 90mm-diameter) or custom wheels and mechanisms to the gearmotor’s output shaft as shown in the left picture below. Alternatively, you could use our 4mm scooter wheel adapter to mount many common scooter, skateboard, and inline skate wheels to the gearmotor’s output shaft as shown in the right picture below.
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Pololu 60×8mm wheel on a Pololu 25D mm metal gearmotor.
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A 25D mm gearmotor connected to a scooter wheel by the 4 mm scooter wheel adapter.
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These are the same type of motors used in the Wild Thumper all-terrain chassis, so the gearbox’s output shaft also works directly with the hex adapters included with the 120mm-diameter Wild Thumper wheels (the left picture below shows a 25D mm gearmotor while the right picture shows the smaller 20D mm gearmotor):
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Dagu Wild Thumper wheel 120×60mm (chrome) with Pololu 25D mm metal gearmotor.
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Dagu Wild Thumper wheel 120×60mm (metallic red) with Pololu 20D mm metal gearmotor.
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