227:1 Metal Gearmotor 25Dx71L mm MP 12V with 48 CPR Encoder

This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 226.76:1 metal spur gearbox, and it has an integrated 48  CPR quadrature encoder  on the   motor shaft, which provides 10,884.47 counts per revolution of the gearbox’s output shaft. 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.

These cylindrical brushed DC gearmotors are available in a wide range of gear ratios and with five different motors (two power levels of 6 V motors and three power levels of 12 V motors). The gearmotors all have the same 25 mm diameter case and 4 mm diameter gearbox output shaft, so it is generally easy to swap one version for another if your design requirements change (though the length of the gearbox tends to increase with the gear ratio). The motor and encoder portion is available by itself (no gearbox) for each combination of power level and nominal operating voltage, and versions without the encoder are also available.

In general, these kinds of motors can run at voltages above and below their nominal voltages (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.These gearmotors are functionally identical to the previous versions carried without end caps (they use the same motor, encoder, and gearboxes). The black plastic 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.

specifications:

• Gear ratio:  226.76:1
• No-load speed @ 12V:  33 rpm
• No-load current @ 12V:  200 mA
• Stall current @ 12V:  2100 mA
• Stall torque @ 12V:  320 oz·in
• No-load speed @ 6V:  16 rpm
• Stall current @ 6V:  1050 mA
• Stall torque @ 6V:  160 oz·in
• Motor type:  2.1A stall @ 12V (MP 12V)
• Lead length:  8 in
• Encoders:  YES

Dimensions:

• Size:  25D x 71L mm
• Weight: 107 g
• Shaft diameter: 4 mm

Package Includes:

• 1x 227:1 Metal Gearmotor With 48 CPR Encoder

Documents / Downloads:

• Dimension diagram of the Pololu 25D Metal Gearmotors
• Comaprison Table   

Note:

Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. For these gearboxes, the recommended upper limit for instantaneous torque is 15 kg-cm (200 oz-in). Strongly advise keeping applied loads well under this limit. Stalls can also result in rapid (potentially on the order of a second) thermal damage to the motor windings and brushes, especially for the versions that use high-power (HP) motors. a general recommendation for brushed DC motor operation is 25% or less of the stall current.