This 224:1 gearmotor (gearbox with brushed DC motor) is a great low-cost alternative to modified hobby servos or Tamiya gearboxes. The low-current motor is a perfect match for our qik 2s9v1 dual serial motor controller, and the compact size makes this unit an attractive choice for small robot designs.

This gearmotor comes pre-assembled, with the gears fully enclosed. There are built-in mounting holes, and the output shaft is 7mm in diameter with two sides flattened (the “D” output is not meant to be used). A built-in safety clutch engages at approximately 60 oz-in.

Compatible products include a custom-molded GMPW plastic wheel, and the Solarbotics GMW motor mount, which can be used as a wheel itself or as a mounting point for other wheels or mechanisms. Solarbotics makes a mounting bracket that works with this motor, and our L-brackets and extended L-brackets for plastic gearmotors are also compatible with this motor (though you might need longer screws than the ones included with the Pololu brackets).

For similar gearmotors, you might want to take a look at:

To increase the power of this gearbox, you can replace the motor with a higher-power RM2 motor. For a replacement motor, see the RM3 motor.

Specifications

  • Description: 90-degree
  • Gear ratio: 224:1
  • 3 V Operation:
    • No-load RPM: ~ 24
    • No-load current: ~ 40 mA
    • Stall current: ~ 400 mA
    • Stall torque: ~ 49 oz-in
  • 6 V Operation:
    • No-load RPM: ~ 46
    • No-load current: ~ 50 mA
    • Stall current: ~ 733 mA
    • Stall torque: ~ 57 oz-in
  • Weight: 31 g

Solarbotics GM3 gearmotor dimensions (in mm).

You can download a pdf version of this drawing with imperial dimensions (126k pdf) or metric dimensions (126k pdf).

Though the product picture shows two gearmotors, this product is for a single motor.


Specifications

Dimensions

Size: 69.4 × 22.2 × 18.6 mm1
Weight: 31 g

General specifications

Gear ratio: 224:1
Free-run speed @ 6V: 46 rpm
Free-run current @ 6V: 50 mA
Stall current @ 6V: 733 mA
Stall torque @ 6V: 57 oz·in
Free-run speed @ 3V: 24 rpm
Free-run current @ 3V: 40 mA
Stall current @ 3V: 400 mA
Stall torque @ 3V: 49 oz·in

Notes:

1
See drawing for detailed dimensions.

Resources

Documentation and other information

Comparison of Solarbotics Gearmotors (GM Series)

Table comparing specifications for the Solarbotics GM motors that we carry.


File downloads

Dimensions (in) (126k pdf)
Dimension diagram for the Solarbotics GM3 gearmotor in inches.
Dimensions (mm) (126k pdf)
Dimension diagram for the Solarbotics GM3 gearmotor in millimeters.
GM3 performance datasheet (165k pdf)
GM3 Solidworks files (2MB zip)

(PL-181)

SKU PL-181
Brand Solarbotics

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