100:1 Metal Gearmotor 37Dx73L mm 12V with 64 CPR Encoder (Helical Pinion)
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- Order number: Pololu-4755
- Manufacturer product ID: 4755
This gearmotor is a powerful 12V brushed DC motor with a 102.08:1 metal gearbox and an integrated quadrature encoder that provides a resolution of 64 counts per revolution of the motor shaft, which corresponds to 6533 counts per revolution of the gearbox’s output shaft. The gearbox is composed mainly of spur gears, but it features helical gears for the first stage for reduced noise and improved efficiency. These units have a 16 mm-long, 6 mm-diameter D-shaped output shaft. This gearmotor is also available without an encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 100 RPM, 150 mA | 34 kg⋅cm (470 oz⋅in), 5.5 A |
These motors are intended for use at 12 V, though in general, these kinds of motors can run at voltages above and below the nominal voltage (they can begin rotating at voltages as low as 1 V). Lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor.
The gearboxes are composed mainly of spur gears, but they feature helical gears for the first stage for reduced noise and improved efficiency:
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| 37D Gearmotor (Helical Pinion) with the gearbox removed showing the helical pinion gear and first mating gear. |
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The encoder portion is protected by a black plastic end cap:
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The end cap is easily removable if you need to access the encoder or want to slightly reduce the overall gearmotor size, but there is a little bit of base plastic that will remain, as shown in the pictures below:
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Exact gear ratio: 25×30×28×28×30/10×10×12×12×12≈102.083:1
Dimensions
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| Dimensions of the 37D mm metal gearmotor with 64 CPR encoder. Units are mm over [inches].
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Specifications
Dimensions
| Size: | 37D × 72.5L mm1 |
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| Weight: | 210 g |
| Shaft diameter: | 6 mm2 |
General specifications
| Gear ratio: | 102.08:1 |
|---|---|
| No-load speed @ 12V: | 100 rpm |
| No-load current @ 12V: | 0.15 A |
| Stall current @ 12V: | 5.5 A3 |
| Stall torque @ 12V: | 34 kg·cm3 |
| Max output power @ 12V: | 8 W |
| No-load speed @ 6V: | 49 rpm4 |
| No-load current @ 6V: | 0.1 A4 |
| Stall current @ 6V: | 3.0 A5 |
| Stall torque @ 6V: | 21 kg·cm5 |
Performance at maximum efficiency
| Max efficiency @ 12V: | 44 % |
|---|---|
| Speed at max efficiency: | 87 rpm |
| Torque at max efficiency: | 4.2 kg·cm |
| Current at max efficiency: | 0.72 A |
| Output power at max efficiency: | 3.8 W |
General specifications
| Lead length: | 20 cm6 |
|---|---|
| Encoders?: | Y |
| Encoder resolution: | 64 CPR |
Notes:
- Length measurement is from gearbox face plate to back of encoder cap (it does not include the output shaft). See dimension diagram for details.
- D shaft.
- Stalling is likely to damage the gearmotor. Stall parameters come from a theoretical extrapolation of performance at loads far from stall. As the motor heats up, as happens as it approaches an actual stall, the stall torque and current decrease.
- This motor will run at 6 V but is intended for operation at 12 V.
- Stalling is likely to damage the gearmotor. Stall parameters come from a theoretical extrapolation of performance at loads far from stall. This motor will run at 6 V but is intended for operation at 12 V.
- May vary by a few centimeters.