The 72001 Planetary Gearbox by Tamiya gets its name from the way the gears rotate like the planets around the sun.
The first in Tamiya’s “high efficiency” series, the planetary gearbox features two 4:1 and two 5:1 stages that can be combined in any way you like—you can even combine two kits to get really huge gear ratios. The output is always conveniently on the same axis as the motor shaft. Available gear ratios are 4:1, 5:1, 16:1, 20:1, 25:1, 80:1, 100:1, and 400:1.
The low-voltage motors in the planetary gearbox run on 3-6 volts and draw up to a few amps, making them perfect candidates for the Pololu low-voltage dual serial motor controller and the DRV8833 motor driver carrier (2130-POLOLU). Motor overheating can be caused by excessive stalling, even at very low voltages. We recommend that you use stall-detection sensors, or just watch your robot, to make sure that it doesn’t stall for more than a few seconds at a time.
This gearbox has a 4 mm diameter, round output shaft, which works with the wheels that are compatible with Tamiya 4 mm, round shafts.
Note: The planetary gearbox is a kit; assembly is required. To use the kit in robotics projects, you need to connect the motors to your own robot controller.
General specifications
| Typical operating voltage: | 4.5 V |
|---|---|
| Gear ratio options: | 4, 5, 16, 20, 25, 80, 100, 400 :1 |
| Free-run motor shaft speed @ 3V: | 6800 rpm1 |
| Free-run current @ 3V: | 130 mA2 |
| Stall current @ 3V: | 2.5 A |
| Motor shaft stall torque @ 3V: | 1.2 oz·in3 |
Notes:
- 1- A theoretical speed of the gearbox output shaft can be computed by dividing this speed by the gear ratio.
- 2- This is the no-load current of the motor when disconnected from the gears in the gearbox; the no-load current of the entire gearbox with the motor connected will be slightly higher and will vary depending on the gear ratio.
- 3- A theoretical torque of the gearbox output shaft can be computed by multiplying this torque by the gear ratio.
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