Pololu Metal Gearmotors » 25D Metal Gearmotors » 12V High-Power (HP) 25D mm Gearmotors »
99:1 Metal Gearmotor 25Dx54L mm HP 12V
This gearmotor consists of a high-power, 12 V brushed DC motor combined with a 98.78:1 metal spur gearbox. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available with an integrated encoder.
voltage | no-load performance | stall extrapolation |
---|---|---|
12 V | 100 RPM, 250 mA | 29 kg⋅cm (400 oz⋅in), 5.0 A |
Alternatives available with variations in these parameter(s): gear ratio motor type encoders? Select variant…
Compare all products in 12V High-Power (HP) 25D mm Gearmotors.
Description | Specs (18) | Pictures (10) | Resources (3) | FAQs (1) | On the blog (0) |
---|
Dimensions
Size: | 25D x 54L mm1 |
---|---|
Weight: | 91 g |
Shaft diameter: | 4 mm2 |
General specifications
Gear ratio: | 98.78:1 |
---|---|
No-load speed @ 12V: | 100 rpm3 |
No-load current @ 12V: | 0.25 A4 |
Stall current @ 12V: | 5.0 A5 |
Stall torque @ 12V: | 29 kg·cm5 |
No-load speed @ 6V: | 50 rpm6 |
Stall current @ 6V: | 2.5 A6 |
Stall torque @ 6V: | 15 kg·cm6 |
Motor type: | 12V, 5.0A stall (HP 12V) |
Performance at maximum efficiency
Max efficiency @ 12V: | 36 % |
---|---|
Speed at max efficiency: | 87 rpm |
Torque at max efficiency: | 4.5 kg·cm |
Current at max efficiency: | 0.94 A |
Output power at max efficiency: | 4.0 W |
General specifications
Encoders?: | N |
---|
Notes:
- 1
- Length measurement is from gearbox face plate to back of motor (it does not include the output shaft or motor terminals). See dimension diagram for details.
- 2
- D shaft.
- 3
- Typical; ±20%.
- 4
- Typical, ±50%; no-load current depends on internal friction, which is affected by many factors, including ambient temperature and duration of motor operation.
- 5
- 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.
- 6
- This motor will run at 6 V but is intended for operation at 12 V.