These brushed DC gearmotors are compact and affordable ? perfect for building a quick, miniature robot. They are intended for use at 4.5 V, though in general, these kinds of motors can run at voltages above and below this nominal voltage, so they should operate comfortably in the 3 V to 6 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 plastic gearbox is protected by a built-in safety clutch that will typically slip before the gear teeth can shear (typically when the load exceeds around 25 oz-in, or 2 kg-cm).
The mini plastic gearmotor family offers two output shaft orientations relative to the motor shaft (offset and 90°), two motor options (normal and high-power, or HP for short), and two gearbox options (120:1 and 180:1). The 120:1 versions are white and the 180:1 versions are yellow:
180:1 mini plastic gearmotor offset 3mm D-shaft output.
120:1 mini plastic gearmotor, 90-degree 3mm D-shaft output, extended motor shaft.
This item has a high-power motor (1250 mA stall current), a 120:1 gearbox, and a 3 mm diameter ?D?-shaped output shaft that is offset from but parallel to the motor shaft. The 1.5 mm diameter motor shaft extends approximately 5 mm past the base of the motor. See the dimension diagram (69k pdf) of this gearmotor for more information.
|Size:||36.5 x 20 x 27.4 mm1|
|Shaft diameter:||3 mm2|
|Shaft type:||offset 3mm D|
|Typical operating voltage:||4.5 V|
|Free-run speed @ 4.5V:||150 rpm|
|Free-run current @ 4.5V:||130 mA|
|Stall current @ 4.5V:||1250 mA|
|Stall torque @ 4.5V:||25 oz·in3|
|Extended motor shaft?:||Y|
- 1 See drawing for detailed dimensions.
- 2 D shaft.
- 3 Note: the gearbox's built-in clutch might start slipping at a lower torque.