Pololu 181 - Solarbotics GM3 224:1 Gear Motor 90 deg. Output

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. A mounting bracket is not required but can be purchased separately for more versatile installation.

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

• Less expensive: Pololu 200:1 plastic gearmotor 90-degree output
• Output shaft parallel to the motor shaft: GM2 gearmotor
• Similar but smaller 120:1 gearmotor: GM7 gearmotor
• Faster version: GM9 gearmotor

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.

People often buy this product together with:

Solarbotics GM2 224:1 Gear Motor Offset Output

Solarbotics GM7 120:1 Mini Gear Motor 90 deg. Output

Tamiya 70103 Universal Gearbox Kit