This gearmotor is a powerful brushed DC motor with 18.75:1 metal gearbox intended for operation at 24 V . The gearbox is composed mainly of spur gears, but it features helical gears for the first stage for reduced noise and improved efficiency.
Our Code: SKU-006086
Supplier Link: [Pololu MPN:4681]
Measuring 37 mm (1.46″) in diameter, these brushed DC gearmotors are the largest and most powerful we carry. They are available in a range of gear ratios from 6.3:1 to 150:1 and with 12 V or 24 V motors, and all versions are available with integrated 64 CPR quadrature encoders on the motor shafts. The 12 V and 24 V motors offer approximately the same performance at their respective nominal voltages, with the 24 V motor drawing half the current of the 12 V motor. See the 37D metal gearmotor datasheet (2MB pdf) for more information, including detailed performance graphs for each gearmotor version. You can also use our dynamically sortable 37D gearmotor comparison table to search for the version that offers the best combination of speed, torque, and current draw for your particular application. A more basic comparison table is available below.
|Gear Ratio||No-Load Speed
|(kg ⋅ cm)||(oz ⋅ in)|
|12 V||5.5 A||0.2 A||1:1 (no gearbox)||10,000||0.5||7||–||–||item #4750|
|6.3:1||1600||3.0||42||12||item #4747||item #4757|
|10:1||1000||4.9||68||12||item #4748||item #4758|
|19:1||530||8.5||120||12||item #4741||item #4751|
|30:1||330||14||190||12||item #4742||item #4752|
|50:1||200||21||290||10||item #4743||item #4753|
|70:1||150||27||380||10*||item #4744||item #4754|
|100:1||100||34||470||8*||item #4745||item #4755|
|131:1||76||45||630||6*||item #4746||item #4756|
|150:1||67||49||680||6*||item #2829||item #2828|
|24 V||3 A||0.1 A||1:1 (no gearbox)||10,000||0.55||8||–||–||item #4690|
|6.3:1||1600||3.5||49||14||item #4688||item #4698|
|10:1||1000||5.5||76||14||item #4689||item #4699|
|19:1||530||9.5||130||13||item #4681||item #4691|
|30:1||330||15||210||13||item #4682||item #4692|
|50:1||200||23||320||12||item #4683||item #4693|
|70:1||140||31||430||10*||item #4684||item #4694|
|100:1||100||39||540||8*||item #4685||item #4695|
|131:1||79||47||650||6*||item #4686||item #4696|
|150:1||68||56||780||6*||item #4687||item #4697|
|* Output power for these units is constrained by gearbox load limits; spec provided is output power at max recommended load of 10 kg⋅cm.|
Note: The listed stall torques and currents are theoretical extrapolations; units will typically stall well before these points as the motors heat up. Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. The recommended upper limit for continuously applied loads is 10 kg-cm (150 oz-in), and the recommended upper limit for instantaneous torque is 25 kg-cm (350 oz-in). Stalls can also result in rapid (potentially on the order of seconds) thermal damage to the motor windings and brushes; 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 the nominal voltages; lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor.
The gearboxes are composed mainly of spur gears, but they feature helical gears for the first stage for reduced noise and improved efficiency:
This gearmotor is a powerful brushed DC motor with 18.75:1 metal gearbox intended for operation at 24 V. The gearbox is composed mainly of spur gears, but it features helical gears for the first stage for reduced noise and improved efficiency. These units have a 16 mm-long, 6 mm-diameter D-shaped output shaft. This gearmotor is also available with an integrated encoder.
|voltage||no-load performance||stall extrapolation|
|24 V||530 RPM, 100 mA||9.5 kg⋅cm (130 oz⋅in), 3 A|
Exact gear ratio: ``(25×30×30) / (10×10×12) = bb(18.75:1)``
Dimensions of the 37D metal gearmotors (without encoders). Units are mm over [inches].
This diagram is also available as a downloadable PDF (459k pdf).
Warning: Do not screw too far into the mounting holes as the screws can hit the gears. We recommend screwing no more than 3mm (0.12″) into the screw hole.
The face plate has six mounting holes evenly spaced around the outer edge threaded for M3 screws. These mounting holes form a regular hexagon and the centers of neighbouring holes are 15.5 mm apart. We carry two brackets for these gearmotors: a stamped aluminium L-bracket (sold in pairs) and a sturdier, tombstone-style machined aluminium bracket (sold individually):
The 6 mm diameter gearbox output shaft works with the Pololu universal aluminium mounting hub for 6mm shafts, which can be used to mount our larger Pololu wheels (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 6mm scooter wheel adaptor to mount many common scooter, skateboard, and inline skate wheels to the gearmotor’s output shaft as shown in the right picture below:
For a general-purpose hex adaptor, consider our 12mm hex wheel adaptor (also available in an extended version), which lets you use these motors with many common hobby RC wheels, including Dagu Wild Thumper Wheels:
12mm Hex Wheel Adaptor for 6mm Shaft connecting a Wild Thumper Wheel to a 37D mm Metal Gearmotor.
We have a number of motor drivers and motor controllers that work with these 37D mm metal gearmotors. We generally recommend our High-Power Motor Drivers, which are available in various power levels and versions, including some dual-channel shields for Arduino and dual-channel expansion boards for Raspberry Pi. Additionally, our VNH5019-based motor drivers, which are also available as single and dual carriers, are a good match for these gearmotors.
If you are looking for higher-level control interfaces, such as USB, RC, analogue voltages, I²C, or TTL serial, consider our Simple Motor Controllers, Jrk motor controllers, or RoboClaw motor controllers; these controllers are available in various power levels several of which can handle these 37D mm metal gearmotors (we generally recommend a motor controller that can handle continuous currents above the stall current of your motor).
We have an assortment of Hall effect-based current sensors to choose from for those who need to monitor motor current:
We offer a wide selection of metal gearmotors that offer different combinations of speed and torque. Our metal gearmotor comparison table can help you find the motor that best meets your project’s requirements.
|Size:||37D × 52L mm1|
|Shaft diameter:||6 mm2|
|No-load speed @ 24V:||530 rpm|
|No-load current @ 24V:||0.1 A|
|Stall current @ 24V:||3 A3|
|Stall torque @ 24V:||9.5 kg·cm3|
|Max output power @ 24V:||13 W|
|No-load speed @ 12V:||270 rpm4|
|No-load current @ 12V:||0.08 A4|
|Stall current @ 12V:||1.7 A4|
|Stall torque @ 12V:||5.2 kg·cm4|
|Max efficiency @ 24V:||52 %|
|Speed at max efficiency:||450 rpm|
|Torque at max efficiency:||1.3 kg·cm|
|Current at max efficiency:||0.49 A|
|Output power at max efficiency:||6.1 W|