Note: We now have a similar, slightly less expensive version of this motor: the Pololu 120:1 mini plastic gearmotor. We also have a version with a 3mm-diameter D-shaft that works with our large selection of Pololu wheels.
This 120:1 gearmotor (gearbox with brushed DC motor) is very compact and weighs only 0.7 ounces (20 grams) — perfect for building a quick, miniature robot.
This gearmotor starts rotation at 0.58 V, drawing only 46.5 mA at 7 RPM. At 5 V, the gearbox and motor provide 20 oz-in of torque and 145 RPM. The free-running current is 88 mA, and the stall current is 610 mA. The low-current motor is a perfect match for our qik 2s9v1 dual serial motor controller.
This gearmotor comes pre-assembled, with the gears fully enclosed. A clutch limits the output torque to approximately 25 oz-in (which is produced at 6.5 V, drawing 650 mA) to protect the gearbox and motor. The unit has one mounting hole, and the chrome-finish output shaft is splined with a 0.08" (2 mm)-crest diameter.
A custom plastic wheel is available for this gearmotor, as well as a LEGO wheel adapter that allows it to be used with a variety of LEGO wheels.
For a version of this gearmotor with the output shaft parallel to the motor shaft, see the GM6 gearmotor. For a similar but larger gearmotor, see the GM3 gearmotor (224:1) and the GM9 gearmotor (143:1).
Specifications
- Description: Mini 90-degree
- Gear ratio: 120:1
- 3 V Operation:
- No-load RPM: ~ 75
- No-load current: ~ 80 mA
- Stall current: ~ 310 mA
- Stall torque: ~ 13.6 oz-in
- 6 V Operation:
- No-load RPM: ~ 146
- No-load current: ~ 92 mA
- Stall current: ~ 525 mA
- Stall torque: ~ 23.8 oz-in
- Weight: 19 g
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Solarbotics GM7 gearmotor dimensions (in mm). |
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You can download a pdf version of this drawing with imperial dimensions (113k pdf) or metric dimensions (113k pdf).
Though the product picture shows two gearmotors, this product is for a single motor.
