Pololu 188 - Solarbotics GM9 143:1 Gear Motor 90 deg. Output

This 143:1 gearmotor (gearbox with brushed DC motor) is a faster version of the GM3 gearmotor. It 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 7 mm in diameter with two sides flattened. Please note that the output shaft is slightly shorter than on the GM2 and GM3 gearmotors. This motor also comes with a built-in safety clutch.

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 120:1 plastic gearmotor 90-degree output
• Higher torque: GM3 gearmotor
• Parallel output shaft: GM8 gearmotor
• Smaller: GM7 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: 143:1
• 3 V Operation:
  • No-load RPM: ~ 40
  • No-load current: ~ 50 mA
  • Stall current: ~ 400 mA
  • Stall torque: ~ 44 oz-in
• 6 V Operation:
  • No-load RPM: ~ 78
  • No-load current: ~ 52 mA
  • Stall current: ~ 700 mA
  • Stall torque: ~ 76 oz-in
• Weight: 33 g

Solarbotics GM9 gearmotor dimensions (in mm).

You can download a pdf version of this drawing with imperial dimensions (100k pdf) or metric dimensions (100k pdf).

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

People often buy this product together with:

Solarbotics GM3 224:1 Gear Motor 90 deg. Output

Solarbotics GM8 143:1 Gear Motor Offset Output

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