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. These units have a 16 mm-long, 6 mm-diameter D-shaped output shaft. This gearmotor is also available with an integrated encoder. Key specifications: voltage no-load performance stall extrapolation 12 V 200 RPM, 200 mA 21 kg⋅cm (290 oz⋅in), 5.5 A Dimensions Dimensions of the 37D metal gearmotors (without encoders). Units are mm over [inches]. Size: 37D × 54L mm1 Weight: 190 g Shaft diameter: 6 mm2 General specifications Gear ratio: 50:1 No-load speed @ 12V: 200 rpm No-load current @ 12V: 0.2 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: 0.15 A4 Stall current @ 6V: 3.0 A4 Stall torque @ 6V: 12 kg·cm4 Motor type: 12V Performance at maximum efficiency 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 General specifications Encoders?: N Notes: 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.
