50:1 Micro Metal Gearmotor with Extended Motor Shaft

50:1 Micro Metal Gearmotor with Extended Motor Shaft
Pololu item #: 2203 636 in stock

Price break Unit price (US$)
1 16.95
10 14.41
50 12.71


backorders allowed

This gearmotor is a miniature (0.94" x 0.39" x 0.47"), low-current brushed DC motor with 51.45:1 metal gearbox, similar to Sanyo’s popular 12 mm gearmotors. These units have a 0.365"-long, 3 mm-diameter D-shaped output shaft. This version also has a 4.5 x 1 mm extended motor shaft.

Key specs at 6 V: 250 RPM and 40 mA free-run, 7 oz-in (0.5 kg-cm) and 0.36 A stall.

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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 ratios—from 5:1 up to 1000:1—and 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 an encoder, such as our magnetic encoder for micro metal gearmotors, to provide motor speed or position feedback.

Motor Type Stall
Current
@ 6 V
No-Load
Speed
@ 6 V
Stall Torque
@ 6 V


Gearbox Shaft Only


Gearbox & Motor Shafts
high-power
(HP)
1600 mA 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
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
medium-power
(MP)
700 mA 2200 RPM 3 oz-in 10:1 micro MP 10:1 micro MP
730 RPM 8 oz-in 30:1 micro MP
420 RPM 13 oz-in 50:1 micro MP
290 RPM 17 oz-in 75:1 micro MP 75:1 micro MP
220 RPM 19 oz-in 100:1 micro MP 100:1 micro MP
150 RPM 24 oz-in 150:1 micro MP
75 RPM 46 oz-in 298:1 micro MP
low-power 360 mA 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
85 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 #2203

Exact gear ratio: ``(32×33×35×38) / (15×14×13×10) ~~ bb(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

Pololu wheel 32×7mm on a micro metal gearmotor.
Pololu wheel 42×19mm with micro metal gearmotor.
A pair of Pololu universal aluminum mounting hubs for 3 mm diameter shafts.

Black Pololu 70×8mm wheel on a Pololu micro metal gearmotor.
Black Pololu 90×10mm wheel on a Pololu micro metal gearmotor.
Pololu 30T track set with drive sprocket mounted on a micro metal gearmotor to the left; idler sprocket is on the right.

Black micro metal gearmotor mounting bracket pair with included screws and nuts.
White micro metal gearmotor mounting bracket pair with included screws and nuts.
Pololu micro metal gearmotor bracket extended with micro metal gearmotor.

  • Quadrature encoders: We offer several quadrature encoders that work with our micro metal gearmotors.

Encoder for Pololu wheel 42×19mm with wheel, motor, and bracket.
Example of an installed micro metal gearmotor reflective optical encoder.
Magnetic Encoder Kit for Micro Metal Gearmotors assembled with ribbon cable wires.

Pololu qik 2s9v1 dual serial motor controller.
Baby Orangutan B-48/B-168/B-328.
DRV8835 dual motor driver carrier.

We also incorporate these motors into some of our products, including our 3pi robot and Zumo robot:

Pololu 3pi robot.
Assembled Zumo robot with a Zumo Shield, Arduino Uno, and Zumo blade.

Selecting the Right Gearmotor

We offer a wide selection of metal gearmotors that offer different combinations of speed and torque. Our metal gearmotor comparison table can help you find the motor that best meets your project’s requirements.

Some of the Pololu metal gearmotors.

People often buy this product together with:

Optical Encoder Pair Kit for Micro Metal Gearmotors, 5V Optical Encoder Pair Kit for Micro Metal Gearmotors, 5V
100:1 Micro Metal Gearmotor with Extended Motor Shaft 100:1 Micro Metal Gearmotor with Extended Motor Shaft
Pololu Micro Metal Gearmotor Bracket Extended Pair Pololu Micro Metal Gearmotor Bracket Extended Pair