Pololu 30: 1 Metal Gearmotor 37Dx52L mm 12V (Helical Pinion)

This gearmotor is a powerful brushed DC motor with 30:1 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. These units have a 16 mm-long, 6 mm-diameter D-shaped output shaft. 

Key specifications:

voltage no-load performance stall extrapolation
12 V 330 RPM, 150 mA 14 kg⋅cm (190 oz⋅in), 5.5 A


Dimensions of the 37D mm metal gearmotor (without encoder). Units are mm over [inches].



Size: 37D × 52L mm1
Weight: 185 g
Shaft diameter: 6 mm2

General specifications

Gear ratio: 30:1
No-load speed @ 12V: 330 rpm
No-load current @ 12V: 0.15 A
Stall current @ 12V: 5.5 A3
Stall torque @ 12V: 14 kg·cm3
Max output power @ 12V: 12 W
No-load speed @ 6V: 170 rpm4
No-load current @ 6V: 0.1 A4
Stall current @ 6V: 3.0 A4
Stall torque @ 6V: 7.9 kg·cm4

Performance at maximum efficiency

Max efficiency @ 12V: 54 %
Speed at max efficiency: 280 rpm
Torque at max efficiency: 1.8 kg·cm
Current at max efficiency: 0.78 A
Output power at max efficiency: 5.1 W

General specifications

Encoders?: N


1: Length measurement is from gearbox face plate to back of motor (it does not include the output shaft or motor terminals). See dimension diagram for details.
2: D shaft.
3: Stalling is likely to damage the gearmotor. Stall parameters come from a theoretical extrapolation of performance at loads far from stall. As the motor heats up, as happens as it approaches an actual stall, the stall torque and current decrease.
4:This motor will run at 6 V but is intended for operation at 12 V.

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