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Pololu 3217 - 47:1 Metal Gearmotor 25Dx52L mm HP 12V with 48 CPR Encoder

This gearmotor consists of a high-power, 12 V brushed DC motor combined with a 46.85:1 metal spur gearbox, and it has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 2248.86 counts per revolution of the gearbox’s output shaft.

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ID: 562784

26.33EUR excl. VAT
32.38EUR incl. 23% VAT

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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:

Motor TypeStall
@ Rated Voltage
@ Rated Voltage
Stall Torque
@ Rated Voltage

With Encoder

Without Encoder
6 Vhigh-power
6.5 A10,000 RPM5 oz-in1:1 HP 6V w/encoder
2150 RPM20 oz-in4.4:1 HP 6V w/encoder4.4:1 HP 6V
990 RPM39 oz-in9.7:1 HP 6V w/encoder9.7:1 HP 6V
460 RPM75 oz-in20.4:1 HP 6V w/encoder20.4:1 HP 6V
280 RPM90 oz-in34:1 HP 6V w/encoder34:1 HP 6V
200 RPM115 oz-in47:1 HP 6V w/encoder47:1 HP 6V
130 RPM150 oz-in75:1 HP 6V w/encoder75:1 HP 6V
97 RPM210 oz-in99:1 HP 6V w/encoder99:1 HP 6V
56 RPM350 oz-in172:1 HP 6V w/encoder172:1 HP 6V
6 Vlow-power
2.4 A6200 RPM2 oz-in1:1 LP 6V w/encoder
1300 RPM8 oz-in4.4:1 LP 6V w/encoder4.4:1 LP 6V
590 RPM17 oz-in9.7:1 LP 6V w/encoder9.7:1 LP 6V
290 RPM33 oz-in20.4:1 LP 6V w/encoder20.4:1 LP 6V
170 RPM50 oz-in34:1 LP 6V w/encoder34:1 LP 6V
120 RPM65 oz-in47:1 LP 6V w/encoder47:1 LP 6V
78 RPM95 oz-in75:1 LP 6V w/encoder75:1 LP 6V
58 RPM130 oz-in99:1 LP 6V w/encoder99:1 LP 6V
34 RPM200 oz-in172:1 LP 6V w/encoder172:1 LP 6V
25 RPM220 oz-in227:1 LP 6V w/encoder227:1 LP 6V
15 RPM300 oz-in378:1 LP 6V w/encoder378:1 LP 6V
11 RPM400 oz-in499:1 LP 6V w/encoder499:1 LP 6V
12 Vhigh-power
5.6 A10,200 RPM5.5 oz-in1:1 HP 12V w/encoder
2250 RPM23 oz-in4.4:1 HP 12V w/encoder4.4:1 HP 12V
1030 RPM44 oz-in9.7:1 HP 12V w/encoder9.7:1 HP 12V
500 RPM85 oz-in20.4:1 HP 12V w/encoder20.4:1 HP 12V
290 RPM120 oz-in34:1 HP 12V w/encoder34:1 HP 12V
210 RPM165 oz-in47:1 HP 12V w/encoder47:1 HP 12V
130 RPM240 oz-in75:1 HP 12V w/encoder75:1 HP 12V
100 RPM300 oz-in99:1 HP 12V w/encoder99:1 HP 12V
12 Vmedium-power
2.1 A7800 RPM2.7 oz-in1:1 MP 12V w/encoder
1700 RPM11 oz-in4.4:1 MP 12V w/encoder4.4:1 MP 12V
770 RPM22 oz-in9.7:1 MP 12V w/encoder9.7:1 MP 12V
370 RPM42 oz-in20.4:1 MP 12V w/encoder20.4:1 MP 12V
220 RPM63 oz-in34:1 MP 12V w/encoder34:1 MP 12V
160 RPM85 oz-in47:1 MP 12V w/encoder47:1 MP 12V
100 RPM125 oz-in75:1 MP 12V w/encoder75:1 MP 12V
76 RPM165 oz-in99:1 MP 12V w/encoder99:1 MP 12V
43 RPM250 oz-in172:1 MP 12V w/encoder172:1 MP 12V
33 RPM320 oz-in227:1 MP 12V w/encoder227:1 MP 12V
12 Vlow-power
1.1 A5600 RPM2 oz-in1:1 LP 12V w/encoder
1200 RPM8 oz-in4.4:1 LP 12V w/encoder4.4:1 LP 12V
560 RPM15 oz-in9.7:1 LP 12V w/encoder9.7:1 LP 12V
260 RPM29 oz-in20.4:1 LP 12V w/encoder20.4:1 LP 12V
150 RPM43 oz-in34:1 LP 12V w/encoder34:1 LP 12V
110 RPM60 oz-in47:1 LP 12V w/encoder47:1 LP 12V
71 RPM85 oz-in75:1 LP 12V w/encoder75:1 LP 12V
55 RPM115 oz-in99:1 LP 12V w/encoder99:1 LP 12V
31 RPM180 oz-in172:1 LP 12V w/encoder172:1 LP 12V
23 RPM240 oz-in227:1 LP 12V w/encoder227:1 LP 12V
14 RPM320 oz-in378:1 LP 12V w/encoder378:1 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.

Details for item #3217:

Exact gear ratio: (22×22×22×22×24):(12×10×10×10×10)46.85:1

Using the encoder (if applicable):

The versions of these gearmotors with encoders use a A two-channel Hall effect sensor to detect the rotation of a magnetic disk on a rear protrusion of the motor shaft. The quadrature encoder provides a resolution of 48 counts per revolution of the motor shaft when counting both edges of both channels. To compute the counts per revolution of the gearbox output, multiply the gear ratio by 48. The motor/encoder has six color-coded, 8″ (20 cm) leads terminated by a 1×6 female header with a 0.1″ pitch, as shown in the main product picture. This header works with standard 0.1″ male headers and our male jumper and precrimped wires. If this header is not convenient for your application, you can pull the crimped wires out of the header or cut the header off. The following table describes the wire functions:

Redmotor power (connects to one motor terminal)
Blackmotor power (connects to the other motor terminal)
Greenencoder GND
Blueencoder Vcc (3.5 – 20 V)
Yellowencoder A output
Whiteencoder B output

The Hall sensor requires an input voltage, Vcc, between 3.5 and 20 V and draws a maximum of 10 mA. The A and B outputs are square waves from 0 V to Vcc approximately 90° out of phase. The frequency of the transitions tells you the speed of the motor, and the order of the transitions tells you the direction.

By counting both the rising and falling edges of both the A and B outputs, it is possible to get 48 counts per revolution of the motor shaft. Using just a single edge of one channel results in 12 counts per revolution of the motor shaft, so the frequency of the A output in the above oscilloscope capture is 12 times the motor rotation frequency.


Size:25D x 64L mm
Weight:101 g
Shaft diameter:4 mm

General specifications:

Gear ratio:46.85:1
Free-run speed @ 12V:210 rpm
Free-run current @ 12V:300 mA
Stall current @ 12V:5600 mA
Stall torque @ 12V:165 oz·in
Free-run speed @ 6V:105 rpm1
Stall current @ 6V:2800 mA1
Stall torque @ 6V:80 oz·in1
Lead length:8 in2
Motor type:5.6A stall @ 12V (HP 12V)


1 This motor will run at 6 V but is intended for operation at 12 V.
2 May vary by a few inches.