POLOLU-998 Pololu

50:1 Micro Metal Gearmotor HP Overview These tiny brushed DC gearmotors are intended for use at 6 V, though in general, these kinds of motors can run at voltages above and below this nominal voltage, so they should comfortably operate in the 3 9 V range (rotation can start at voltages as low as 0.5 V). Lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor. The micro metal gearmotors are available in a wide range of gear ratiosfrom 5:1 up to 1000:1and offer a choice between three different motors: high-power (HP), medium-power (MP), and standard. With the exception of the 1000:1 gear ratio versions, all of the micro metal gearmotors have the same physical dimensions, so one version can be easily swapped for another if your design requirements change. Please see the micro metal gearmotor comparison table for detailed specifications of all our micro metal gearmotors. This dynamically-sortable table can help you find the gearmotor that offers the best blend of speed, torque, and current-draw for your particular application. A more basic comparison table is available below. Some versions of the gearmotors are sold with an additional 1mm-diameter output shaft that protrudes from the rear of the motor. This 4.5mm-long rear shaft rotates at the same speed as the input to the gearbox and offers a way to add a custom-built encoder to provide motor speed or position feedback. StallCurrent No-LoadSpeed Stall Torque Gearbox Shaft Gearbox & Motor Motor Type 6 V 6 V 6 V Only Shafts 6000 RPM 2 oz-in 5:1 micro HP 3000 RPM 4 oz-in 10:1 micro HP 10:1 micro HP 1000 RPM 9 oz-in 30:1 micro HP 30:1 micro HP 625 RPM 15 oz-in 50:1 micro HP 50:1 micro HP 400 RPM 22 oz-in 75:1 micro HP 75:1 micro HP high-power(HP) 1600 mA 320 RPM 30 oz-in 100:1 micro HP 100:1 micro HP 200 RPM 40 oz-in 150:1 micro HP 140 RPM 50 oz-in 210:1 micro HP 120 RPM 60 oz-in 250:1 micro HP 100 RPM 70 oz-in 298:1 micro HP 298:1 micro HP 32 RPM 125 oz-in 1000:1 micro HP 2200 RPM 3 oz-in 10:1 micro MP 730 RPM 8 oz-in 30:1 micro MP 420 RPM 13 oz-in 50:1 micro MP medium- 700 mA 290 RPM 17 oz-in 75:1 micro MP power(MP) 220 RPM 19 oz-in 100:1 micro MP 150 RPM 24 oz-in 150:1 micro MP 75 RPM 46 oz-in 298:1 micro MP 2500 RPM 1 oz-in 5:1 micro 1300 RPM 2 oz-in 10:1 micro 440 RPM 4 oz-in 30:1 micro 30:1 micro 250 RPM 7 oz-in 50:1 micro 50:1 micro 170 RPM 9 oz-in 75:1 micro 120 RPM 12 oz-in 100:1 micro 100:1 micro low-power 360 mA85 RPM 17 oz-in 150:1 micro 60 RPM 27 oz-in 210:1 micro 50 RPM 32 oz-in 250:1 micro 45 RPM 40 oz-in 298:1 micro 298:1 micro 14 RPM 70 oz-in 1000:1 micro Note: The 1000:1 gearmotors can generate enough torque to damage themselves. The stall torque values given for those two motors are theoretical, and we strongly recommend you avoid stalling them. Details for item 998 Exact gear ratio: (32333538) / (15141310) (51.45:1) Gearmotor Dimensions Micro metal gearmotor dimensions (units in mm). The gearbox has a long (0.365 or 9.27 mm), 3 mm-diameter D-shaped metal output shaft, and the brass faceplate has two mounting holes threaded for M1.6 screws (1.6 mm diameter, 0.35 mm thread pitch). The gearmotor weighs approximately 0.35 oz (10 g). Versions with the extended motor shaft have a 1mm diameter round shaft that protrudes 4.5 mm from the rear of the motor, between the two motor terminals this is not pictured in the above dimension diagram. The gearbox on the 1000:1 and 1000:1 HP micro metal gearmotors is 12.5 mm long. All of the other micro metal gearmotors have 9mm-long gearboxes, as shown in the above dimension diagram. Motor Accessories Wheels and Hubs: The micro metal gearmotors output shaft matches our assortment of Pololu wheels and the Solarbotics RW2 ruer wheel. You can also use our Pololu universal mounting hubs to mount custom wheels and mechanism to the micro metal gearmotors output shaft.