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This Pololu 37D Gearmotor is a powerful brushed DC motor with 50:1 metal gearbox intended for operation at 12V. 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, 6mm-diameter D-shaped output shaft. Measuring 37mm in diameter, these brushed DC gearmotors are the largest and most powerful we carry.
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. This motor will run at 6V but is intended for operation at 12V.
We also stock 100:1 and 150:1 versions of this motor. You can find our entire range of motors here.
Note: Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. The listed stall torques and currents are theoretical extrapolations; units will typically stall well before these points as the motors heat up. 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.
Voltage | 12V |
Gear ratio | 50:1 |
No-load speed @ 12V | 200 rpm |
No-load current @ 12V | 0.2A |
Stall current @ 12V | 5.5A |
Stall torque @ 12V | 21 kg·cm |
Max output power @ 12V | 10W |
No-load speed @ 6V | 100 rpm |
No-load current @ 6V | 0.15 A |
Stall current @ 6V | 3.0 A |
Stall torque @ 6V | 12 kg·cm |
Size | 37D × 54L mm |
Weight | 190g |
Shaft diameter | 6mm |
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 |
The downloadable diagram shows the dimensions of the 37D line of metal gearmotors (units are mm over [inches]).
Warning: Do not screw too far into the mounting holes as the screws can hit the gears. We recommend screwing no more than 3mm into the screw holes.