This gearmotor is a powerful brushed DC motor with 50:1 metal gearbox intended for operation at 12 V. The gearbox is composed mainly of spur gears, but it features helical gears for the first stage for reduced noise and improved efficiency.
In stock in Australia
Our Code: SKU-005598
Supplier Link: [Pololu MPN:4743]
This powerful brushed DC gearmotor is available in six different gear ratios. Versions with an integrated quadrature encoder are also available, including just the motor and encoder portion by itself (no gearbox).
|Gear Ratio||No-Load Speed
|(kg ⋅ cm)||(oz ⋅ in)|
|12 V||5.5 A||0.15 A||1:1 (no gearbox)||10,000||0.5||7||–||–||item #4750|
|19:1||540||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|
Note: Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. In order to avoid damaging the gearbox, we recommend keeping continuously applied loads under 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.
These motors are intended for use at 12 V, though in general, these kinds of motors can run at voltages above and below the nominal voltage (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.
Exact gear ratio: ``(25×30×25×40) / (10×10×15×10) =bb(50:1)``
This gearmotor is a powerful brushed DC motor with 50:1 metal gearbox intended for operation at 12 V. 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|
|12 V||200 RPM, 150 mA||21 kg⋅cm (290 oz⋅in), 5.5 A|
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:
This diagram is also available as a downloadable PDF (461k pdf).
Warning: Do not screw too far into the mounting holes as the screws can hit the gears. We recommend screwing no further than 3mm (1/8″) into the screw hole.
37D mm metal gearmotor next to a micro metal gearmotor for size comparison.
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 × 54L mm1|
|Shaft diameter:||6 mm2|
|No-load speed @ 12V:||200 rpm|
|No-load current @ 12V:||0.15 A|
|Stall current @ 12V:||5.5 A3|
|Stall torque @ 12V:||21 kg·cm3|
|Max output power @ 12V:||10 W|
|No-load speed @ 6V:||100 rpm4|
|No-load current @ 6V:||0.1 A4|
|Stall current @ 6V:||3.0 A5|
|Stall torque @ 6V:||12 kg·cm5|
|Max efficiency @ 12V:||51 %|
|Speed at max efficiency:||180 rpm|
|Torque at max efficiency:||2.2 kg·cm|
|Current at max efficiency:||0.66 A|
|Output power at max efficiency:||4.0 W|
No; the information we have available for this motor can be found on its product page. However, you can approximate various additional motor parameters from the information found in the “Specs” tab.
The electrical resistance of the motor can be approximated by dividing the rated voltage by the stall current (at the rated voltage). The electromotive force constant (Ke) can be approximated by dividing the rated voltage by the free-run speed (at the rated voltage). To approximate the motor torque constant (Kt), you can divide the stall torque by the stall current.
For pretty much any DC motor, the current, speed, power, and efficiency curves as a function of torque will look like those in the graph below (assuming motor voltage and temperature are constant):
The current and speed curves are approximately linear, and the product pages for our motors provide the approximate end points for these lines: (0 torque, no-load current) and (stall torque, stall current) for the red line, and (0 torque, no-load speed) and (stall torque, 0 speed) for the blue line.
The orange output power curve is the product of the speed and the torque, which results in an inverted parabola with its peak at 50% of the stall torque.
The green efficiency curve is the output power divided by the input power, where the input power is current times voltage. The voltage is constant, so you can divide the output power curve by the current line to get the general shape of the efficiency curve, which in turn lets you identify the torque, speed, and current that correspond to max efficiency.
There are many programs out there that you can use to generate these curves. For example, if you have access to MATLAB, you can use this customer-created MATLAB script to generate these motor plots for you from the specifications we provide for each gearmotor.
Note: A good general rule of thumb is to keep the continuous load on a DC motor from exceeding approximately 20% to 30% of the stall torque. Stalling gearmotors can greatly decrease their lifetimes, occasionally resulting in to the gearbox or thermal damage to the motor windings or brushes. Do not expect to be able to safely operate a brushed DC gearmotor all the way to stall. The safe operating range will depend on the specifics of the gearmotor itself.