Pololu 3238 - 9.7:1 Metal Gearmotor 25Dx48L mm MP 12V with 48 CPR Encoder

Overview:

These cylindrical brushed DC gearmotors are available in a wide range of gear ratios and with five different motors (two power levels of 6V motors and three power levels of 12V 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). All versions are also available with an integrated 48 CPR quadrature encoder on the motor shaft. Please see the 25D metal gearmotor comparison table for detailed specifications of all our 25D metal gearmotors. This dynamically-sortable table can help you find the gearmotor that offers the best blend of speed, torque, and current-draw for your particular application. A more basic comparison table is available below:

Rated Voltage	Motor Type	Stall Current @ Rated Voltage	No-Load Speed @ Rated Voltage	Approximate Stall Torque @ Rated Voltage	With Encoder	Without Encoder
6 V	high-power (HP)	6.5 A	10,000 RPM	5 oz-in	1:1 HP 6V w/encoder
			2150 RPM	20 oz-in	4.4:1 HP 6V w/encoder	4.4:1 HP 6V
			990 RPM	39 oz-in	9.7:1 HP 6V w/encoder	9.7:1 HP 6V
			460 RPM	75 oz-in	20.4:1 HP 6V w/encoder	20.4:1 HP 6V
			280 RPM	90 oz-in	34:1 HP 6V w/encoder	34:1 HP 6V
			200 RPM	115 oz-in	47:1 HP 6V w/encoder	47:1 HP 6V
			130 RPM	150 oz-in	75:1 HP 6V w/encoder	75:1 HP 6V
			97 RPM	210 oz-in	99:1 HP 6V w/encoder	99:1 HP 6V
			56 RPM	350 oz-in	172:1 HP 6V w/encoder	172:1 HP 6V
6 V	low-power (LP)	2.4 A	6200 RPM	2 oz-in	1:1 LP 6V w/encoder
			1300 RPM	8 oz-in	4.4:1 LP 6V w/encoder	4.4:1 LP 6V
			590 RPM	17 oz-in	9.7:1 LP 6V w/encoder	9.7:1 LP 6V
			290 RPM	33 oz-in	20.4:1 LP 6V w/encoder	20.4:1 LP 6V
			170 RPM	50 oz-in	34:1 LP 6V w/encoder	34:1 LP 6V
			120 RPM	65 oz-in	47:1 LP 6V w/encoder	47:1 LP 6V
			78 RPM	95 oz-in	75:1 LP 6V w/encoder	75:1 LP 6V
			58 RPM	130 oz-in	99:1 LP 6V w/encoder	99:1 LP 6V
			34 RPM	200 oz-in	172:1 LP 6V w/encoder	172:1 LP 6V
			25 RPM	220 oz-in	227:1 LP 6V w/encoder	227:1 LP 6V
			15 RPM	300 oz-in	378:1 LP 6V w/encoder	378:1 LP 6V
			11 RPM	400 oz-in	499:1 LP 6V w/encoder	499:1 LP 6V
12 V	high-power (HP)	5.6 A	10,200 RPM	5.5 oz-in	1:1 HP 12V w/encoder
			2250 RPM	23 oz-in	4.4:1 HP 12V w/encoder	4.4:1 HP 12V
			1030 RPM	44 oz-in	9.7:1 HP 12V w/encoder	9.7:1 HP 12V
			500 RPM	85 oz-in	20.4:1 HP 12V w/encoder	20.4:1 HP 12V
			290 RPM	120 oz-in	34:1 HP 12V w/encoder	34:1 HP 12V
			210 RPM	165 oz-in	47:1 HP 12V w/encoder	47:1 HP 12V
			130 RPM	240 oz-in	75:1 HP 12V w/encoder	75:1 HP 12V
			100 RPM	300 oz-in	99:1 HP 12V w/encoder	99:1 HP 12V
12 V	medium-power (MP)	2.1 A	7800 RPM	2.7 oz-in	1:1 MP 12V w/encoder
			1700 RPM	11 oz-in	4.4:1 MP 12V w/encoder	4.4:1 MP 12V
			770 RPM	22 oz-in	9.7:1 MP 12V w/encoder	9.7:1 MP 12V
			370 RPM	42 oz-in	20.4:1 MP 12V w/encoder	20.4:1 MP 12V
			220 RPM	63 oz-in	34:1 MP 12V w/encoder	34:1 MP 12V
			160 RPM	85 oz-in	47:1 MP 12V w/encoder	47:1 MP 12V
			100 RPM	125 oz-in	75:1 MP 12V w/encoder	75:1 MP 12V
			76 RPM	165 oz-in	99:1 MP 12V w/encoder	99:1 MP 12V
			43 RPM	250 oz-in	172:1 MP 12V w/encoder	172:1 MP 12V
			33 RPM	320 oz-in	227:1 MP 12V w/encoder	227:1 MP 12V
12 V	low-power (LP)	1.1 A	5600 RPM	2 oz-in	1:1 LP 12V w/encoder
			1200 RPM	8 oz-in	4.4:1 LP 12V w/encoder	4.4:1 LP 12V
			560 RPM	15 oz-in	9.7:1 LP 12V w/encoder	9.7:1 LP 12V
			260 RPM	29 oz-in	20.4:1 LP 12V w/encoder	20.4:1 LP 12V
			150 RPM	43 oz-in	34:1 LP 12V w/encoder	34:1 LP 12V
			110 RPM	60 oz-in	47:1 LP 12V w/encoder	47:1 LP 12V
			71 RPM	85 oz-in	75:1 LP 12V w/encoder	75:1 LP 12V
			55 RPM	115 oz-in	99:1 LP 12V w/encoder	99:1 LP 12V
			31 RPM	180 oz-in	172:1 LP 12V w/encoder	172:1 LP 12V
			23 RPM	240 oz-in	227:1 LP 12V w/encoder	227:1 LP 12V
			14 RPM	320 oz-in	378:1 LP 12V w/encoder	378:1 LP 12V

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 200 oz-in (15 kg-cm); we 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.

In general, these kinds of motors can run at voltages above and below their nominal voltages; lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor.

Dimensions:

General specifications:

Notes:

1 This motor will run at 6 V but is intended for operation at 12 V.

2 May vary by a few inches.