20.4:1 Metal Gearmotor 25Dx50L mm

20.4:1 Metal Gearmotor 25Dx50L mm
Pololu item #: 1583 55 in stock

Price break Unit price (US$)
1 19.95
10 17.96


backorders allowed

This cylindrical, 1.97" x 0.98" x 0.98" brushed DC gearmotor with a 20.4:1 metal gearbox is a lower-current alternative to the HP version. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft.

Key specs at 6 V: 275 RPM and 80 mA free-run, 24 oz-in (1.7 kg-cm) and 2.2 A stall.

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 Description Specs (8) Pictures (4) Resources (0) FAQs (1) On the blog (0) 

Overview

This brushed DC gearmotor is available in high- and low-power versions in a number of gear ratios. Integrated quadrature encoders are also available on certain gear ratios, including just the motor portion by itself (i.e. no gearbox).

Gear Ratio No-Load
Speed
@ 6 V
Stall Torque
@ 6 V
Stall Current
@ 6 V


With Encoder


Without Encoder
1:1 9800 RPM 2 oz-in 6 A motor without gearbox
5600 RPM 1 oz-in 2.2 A motor without gearbox
4.4:1 2220 RPM 8 oz-in 6 A 25Dx48L mm HP 25Dx48L mm HP
1280 RPM 5 oz-in 2.2 A 25Dx48L mm
9.7:1 1010 RPM 17 oz-in 6 A 25Dx48L mm HP 25Dx48L mm HP
580 RPM 11 oz-in 2.2 A 25Dx48L mm 25Dx48L mm
20.4:1 480 RPM 36 oz-in 6 A 25Dx50L mm HP
275 RPM 24 oz-in 2.2 A 25Dx50L mm
34:1 285 RPM 60 oz-in 6 A 25Dx52L mm HP 25Dx52L mm HP
165 RPM 40 oz-in 2.2 A 25Dx52L mm 25Dx52L mm
47:1 210 RPM 80 oz-in 6 A 25Dx52L mm HP 25Dx52L mm HP
120 RPM 50 oz-in 2.2 A 25Dx52L mm 25Dx52L mm
75:1 130 RPM 130 oz-in 6 A 25Dx54L mm HP 25Dx54L mm HP
75 RPM 85 oz-in 2.2 A 25Dx54L mm 25Dx54L mm
99:1 100 RPM 160 oz-in 6 A 25Dx54L mm HP 25Dx54L mm HP
57 RPM 110 oz-in 2.2 A 25Dx54L mm
172:1 57 RPM 260 oz-in 6 A 25Dx56L mm HP
33 RPM 170 oz-in 2.2 A 25Dx56L mm 25Dx56L mm
227:1 25 RPM 220 oz-in 2.2 A 25Dx56L mm
378:1 15 RPM 250 oz-in 2.2 A 25Dx58L mm
499:1 12 RPM 300 oz-in 2.2 A 25Dx58L 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.

Details for item #1583

Exact gear ratio: ``(22×22×22×23) / (12×10×10×10) ~~ bb(20.4:1)``

Gearmotor accessories

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 metal gearmotor bracket pair.
Pololu 25D mm gearmotor with bracket.

The 4 mm diameter gearbox output shaft works with Pololu universal aluminum mounting hub for 4mm shafts, which 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 as shown in the left picture below. Alternatively, you could use our 4mm scooter wheel adapter to mount many common scooter, skateboard, and inline skate wheels to the gearmotor’s output shaft as shown in the right picture below.

Pololu 60×8mm wheel on a Pololu 25D mm metal gearmotor.
A 25D mm gearmotor connected to a scooter wheel by the 4 mm scooter wheel adapter.

These are the same type of motors used in the Wild Thumper all-terrain chassis, so the gearbox’s output shaft also works directly with the hex adapters included with the 120mm-diameter Wild Thumper wheels (the left picture below shows a 25D mm gearmotor while the right picture shows the smaller 20D mm gearmotor):

Dagu Wild Thumper wheel 120×60mm (chrome) with Pololu 25D mm metal gearmotor.
Dagu Wild Thumper wheel 120×60mm (metallic red) with Pololu 20D mm metal gearmotor.
For a general-purpose hex adapter, consider our 12mm hex wheel adapter, which lets you use this motor with many common hobby RC wheels.

12mm Hex Wheel Adapter for 4mm Shaft on a 20D mm Metal Gearmotor.

Dimensions

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 Ratio L (mm)
4.4:1
9.7:1
17
20.4:1 19
34.1
47:1
21
75:1
99:1
23
172:1
227:1
25
378:1
499:1
27

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 Universal Aluminum Mounting Hub for 4mm Shaft, #4-40 Holes (2-Pack) Pololu Universal Aluminum Mounting Hub for 4mm Shaft, #4-40 Holes (2-Pack)
Pololu Micro Metal Gearmotor Bracket Extended Pair Pololu Micro Metal Gearmotor Bracket Extended Pair
34:1 Metal Gearmotor 25Dx52L mm 34:1 Metal Gearmotor 25Dx52L mm

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Related Categories

25D mm Gearmotors
Pololu Wheels and Tracks
Brushed DC Motor Controllers
Brushed DC Motor Drivers
Robot Controllers
Current Sensors
37D mm Gearmotors
Micro Metal Gearmotors
Wild Thumper All-Terrain Chassis
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