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Obniżka! Pololu 2284 - 34:1 Metal Gearmotor 25Dx52L mm with 48 CPR Encoder Zobacz większe

Pololu 2284 - 34:1 Metal Gearmotor 25Dx52L mm with 48 CPR Encoder

34:1 Metal Gearmotor 25Dx52L mm with 48 CPR Encoder

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ID: 195952

159,00 zł

-24,00 zł

135,00 zł brutto (23% VAT)
109,76 zł netto

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Moc silnika DCLP
Materiał przekładniMetalowa
Prędkość obrotowa170 RPM
Średnica wału4 mm
Kształt wałuLitera D
Obustronny wał silnikaTak
Napięcie zasilania6 V

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34:1 Metal Gearmotor 25Dx52L mm with 48 CPR Encoder

This cylindrical, 2.54" x 0.98" x 0.98" brushed DC gearmotor with a 34.014:1 metal gearbox is a lower-current alternative to the HP version. It has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 1633 counts per revolution of the gearbox’s output shaft. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. This gearmotor is also available without an encoder.

Key specs at 6 V: 165 RPM and 80 mA free-run, 40 oz-in (2.9 kg-cm) and 2.2 A stall.

Gearmotor Options

This brushed DC gearmotor is available in high- and low-power versions in a number of gear ratios. Many other gear ratios are also available without an encoder.

Gear RatioSpeed
@ 6V
Stall Torque
@ 6V
Stall Current
@ 6V

With Encoder

Without Encoder
4.4:12020 RPM8 oz-in6 A25Dx48L mm HP
1280 RPM5 oz-in2.2 A25Dx48L mm
9.7:11010 RPM17 oz-in6 A25Dx48L mm HP25Dx48L mm HP
580 RPM11 oz-in2.2 A25Dx48L mm25Dx48L mm
20.4:1480 RPM36 oz-in6 A25Dx50L mm HP
275 RPM24 oz-in2.2 A25Dx50L mm
34:1285 RPM60 oz-in6 A25Dx52L mm HP25Dx52L mm HP
165 RPM40 oz-in2.2 A25Dx52L mm25Dx52L mm
47:1210 RPM80 oz-in6 A25Dx52L mm HP25Dx52L mm HP
120 RPM50 oz-in2.2 A25Dx52L mm25Dx52L mm
75:1130 RPM130 oz-in6 A25Dx54L mm HP25Dx54L mm HP
75 RPM85 oz-in2.2 A25Dx54L mm25Dx54L mm
99:1100 RPM160 oz-in6 A25Dx54L mm HP
57 RPM110 oz-in2.2 A25Dx54L mm
172:157 RPM260 oz-in6 A25Dx56L mm HP
33 RPM170 oz-in2.2 A25Dx56L mm25Dx56L mm
227:125 RPM220 oz-in2.2 A25Dx56L mm
378:115 RPM250 oz-in2.2 A25Dx58L mm
499:112 RPM300 oz-in2.2 A25Dx58L mm

Note: At some of the higher gear ratios, these motors can generate enough torque to damage themselves. Any torque greater than about 250 oz-in (18 kg-cm) is likely to damage the gearbox, so we recommend that you avoid stalling the 172:1 HP, 227:1, 378:1, and 499:1 versions of these motors at 6 V.

These motors are intended for use at 6 V. In general, these kinds of motors can run at voltages above and below this nominal voltage, so they should comfortably operate in the 3 – 9 V range, though they can begin rotating at voltages as low as 1 V. Higher voltages could start negatively affecting the life of the motor.

Gearmotor Dimensions

These gearmotors have output shafts with a diameter of 4 mm. The Pololu universal aluminum mounting hub for 4mm shafts can be used to mount our larger Pololu wheels (60mm-, 70mm-, 80mm-, and 90mm-diameter) or custom wheels and mechanisms to the gearmotor’s output shaft (see the left picture below). These are the same type of motors used in the Wild Thumper all-terrain chassis, and the gearbox’s output shaft works directly with the 120mm-diameter Wild Thumper wheels.

25D mm metal gear motor with 48 CPR encoder and Pololu 60×8mm wheel.

The face plate has two mounting holes threaded for M3 screws. You can use our custom-designed 25D mm metal gearmotor bracket (shown in the picture below) to mount the gearmotor to your project via these mounting holes and the screws that come with the bracket.

Pololu 25D mm gearmotor with bracket.

The diagram below shows the dimensions (in mm) of the 25D mm line of gearmotors. The value of L is shown in the table below.

Dimension diagram (in mm) for the 25D mm metal gearmotors.

Gear RatioL (mm)

25D mm metal gearmotor with 48 CPR encoder.

Using the Encoder

A two-channel Hall effect encoder is used to sense 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. To compute the counts per revolution of the gearbox output, multiply the gear ratio by 48. The motor/encoder has six color-coded, 11" (28 cm) leads:

Blackmotor power
Redmotor power
BlueHall sensor Vcc (3.5 – 20 V)
GreenHall sensor GND
YellowHall sensor A output
WhiteHall sensor B output

These leads have stripped, unterminated ends that can be soldered or crimped to make solder free connectors. 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. The following oscilloscope capture shows the A and B (yellow and white) encoder outputs using a motor voltage of 6 V and a Hall sensor Vcc of 5 V:

Encoder A and B outputs for 25D mm HP metal gearmotor with 48 CPR encoder (motor running at 6 V).

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.

May 5, 2012 Update: We are transitioning to encoders with leads terminated by a 1×6 0.1” female header. If you receive an encoder with such a header, you can pull the crimped wires out of the header or cut the header off if you just want the individual wires.

Selecting the Right Gearmotor

We offer a wide selection of metal gearmotors that offer different combinations of speed and torque. Our metal gearmotor comparison table can help you find the motor that best meets your project’s requirements.

Some of the Pololu metal gearmotors.

People often buy this product together with:

Pololu 25D mm Metal Gearmotor Bracket PairPololu 25D mm Metal Gearmotor Bracket Pair
Pololu Universal Aluminum Mounting Hub for 4mm Shaft Pair, 4-40 HolesPololu Universal Aluminum Mounting Hub for 4mm Shaft Pair, 4-40 Holes