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 0.7ounces (20grams)mdash;perfect for building a quick, miniature robot.
This gearmotor starts rotation at 0.58V, drawing only 46.5mA at 7RPM. At 5V, the gearbox and motor provide 20oz-in of torque and 145RPM. The free-running current is 88mA, and the stall current is 610mA. 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 25oz-in (which is produced at 6.5V, drawing 650mA) to protect the gearbox and motor. The unit has one mounting hole, and the chrome-finish output shaft is splined with a 0.08 (2mm)-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.