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31:1 металл араат мотор 20Dx41L мм 6V CB

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31:1 Metal Gearmotor 20Dx41L mm 6V CB

Pololu item #: 3701

These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor with long-life carbon brushes combined with a 31.25:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox.

Key specs at 6 V: 470 RPM and 170 mA with no load, 28 oz-in (2.0 kg-cm) and 2.9 A at stall.

Dimensions

Size:	20D × 41L mm
Weight:	44 g
Shaft diameter:	4 mm

General specifications

Gear ratio:	31.25:1
No-load speed @ 6V:	470 rpm
No-load current @ 6V:	170 mA
Stall current @ 6V:	2.9 A
Stall torque @ 6V:	28 oz·in
Extended motor shaft?:	N
Motor type:	2.9A stall @ 6V CB (carbon brush)

Overview

These cylindrical brushed DC gearmotors are available in a wide range of gear ratios, from 25:1 up to 488:1, and with three different motors: 6 V and 12 V motors with long-life carbon brushes (CB), and a 6 V motor with shorter-life precious metal brushes. All three motors offer similar performances at their respective nominal voltages, just with the 12 V motor drawing approximately half the current of the 6 V motor and with the carbon brush versions having longer lifetimes than the one with precious metal brushes.

The CB versions (shown on the right in the picture below), can be differentiated from versions with percious metal brushes (shown on the left) by their copper-colored terminals.

These gearmotors are optionally available with an additional 2 mm-diameter output shaft that protrudes 6 mm from the rear of the motor (see the middle picture below). This rear shaft rotates at the same speed as the input to the gearbox and offers a way to add an encoder, such as our magnetic encoder for 20D mm metal gearmotors as shown in the right picture below, to provide motor speed or position feedback.

20D mm metal gearmotor CB with long-life carbon brushes.

20D mm metal gearmotor CB with long-life carbon brushes and an extended motor shaft.

Magnetic Encoder Kit for 20D mm Metal Gearmotors assembled on a 20D mm metal gearmotor with extended motor shaft.

The gearmotors all have 20 mm-diameter gearboxes and 4 mm-diameter gearbox output shafts, 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). Please see the 20D mm metal gearmotor comparison table for detailed specifications of all our 20D mm 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	Brush Type	Stall Current @ Rated Voltage	No-Load Speed @ Rated Voltage	Approximate Stall Torque @ Rated Voltage	Single-Shaft (Gearbox Only)	Dual-Shaft (Gearbox & Motor)


12 V	long-life carbon (CB)	1.6 A	570 RPM	26 oz-in	25:1 12V CB	25:1 12V CB dual shaft
			450 RPM	33 oz-in	31:1 12V CB	31:1 12V CB dual shaft
			225 RPM	58 oz-in	63:1 12V CB	63:1 12V CB dual shaft
			180 RPM	75 oz-in	78:1 12V CB	78:1 12V CB dual shaft
			140 RPM	85 oz-in	100:1 12V CB	100:1 12V CB dual shaft
			110 RPM	110 oz-in	125:1 12V CB	125:1 12V CB dual shaft
			90 RPM	130 oz-in	156:1 12V CB	156:1 12V CB dual shaft
			72 RPM	160 oz-in	195:1 12V CB	195:1 12V CB dual shaft
			57 RPM	200 oz-in	250:1 12V CB	250:1 12V CB dual shaft
			45 RPM	250 oz-in	313:1 12V CB	313:1 12V CB dual shaft
			36 RPM	290 oz-in	391:1 12V CB	391:1 12V CB dual shaft
			29 RPM	350 oz-in	488:1 12V CB	488:1 12V CB dual shaft


6 V	long-life carbon (CB)	2.9 A	590 RPM	22 oz-in	25:1 6V CB	25:1 6V CB dual shaft
			470 RPM	28 oz-in	31:1 6V CB	31:1 6V CB dual shaft
			230 RPM	54 oz-in	63:1 6V CB	63:1 6V CB dual shaft
			190 RPM	62 oz-in	78:1 6V CB	78:1 6V CB dual shaft
			150 RPM	72 oz-in	100:1 6V CB	100:1 6V CB dual shaft
			120 RPM	87 oz-in	125:1 6V CB	125:1 6V CB dual shaft
			93 RPM	110 oz-in	156:1 6V CB	156:1 6V CB dual shaft
			75 RPM	130 oz-in	195:1 6V CB	195:1 6V CB dual shaft
			60 RPM	170 oz-in	250:1 6V CB	250:1 6V CB dual shaft
			46 RPM	220 oz-in	313:1 6V CB	313:1 6V CB dual shaft
			37 RPM	260 oz-in	391:1 6V CB	391:1 6V CB dual shaft
			30 RPM	310 oz-in	488:1 6V CB	488:1 6V CB dual shaft


6 V	precious metal	2.9 A	590 RPM	22 oz-in	25:1 6V	25:1 6V dual-shaft
			470 RPM	28 oz-in	31:1 6V	31:1 6V dual-shaft
			230 RPM	54 oz-in	63:1 6V	63:1 6V dual-shaft
			190 RPM	62 oz-in	78:1 6V	78:1 6V dual-shaft
			150 RPM	72 oz-in	100:1 6V	100:1 6V dual-shaft
			120 RPM	87 oz-in	125:1 6V	125:1 6V dual-shaft
			93 RPM	110 oz-in	156:1 6V	156:1 6V dual-shaft
			75 RPM	130 oz-in	195:1 6V	195:1 6V dual-shaft
			60 RPM	170 oz-in	250:1 6V	250:1 6V dual-shaft
			46 RPM	220 oz-in	313:1 6V	313:1 6V dual-shaft
			37 RPM	260 oz-in	391:1 6V	391:1 6V dual-shaft
			30 RPM	310 oz-in	488:1 6V	488:1 6V dual-shaft

Note: Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. In order to avoid damaging the gearbox, we recommend keeping continuously applied loads under 50 oz-in (3.5 kg*cm) for the versions with precious metal brushes and under 70 oz-in (5 kg-cm) for the versions with carbon brushes (the ones with “CB” in the name). Stalls can also result in rapid (potentially on the order of a second) thermal damage to the motor windings and brushes, especially for motors like this that can deliver a lot of power for their size; a general recommendation for brushed DC motors is to limit continuous current to approximately 25% 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 #3701

Exact gear ratio: ( $\frac{28 \times 25 \times 25 \times 25}{14 \times 10 \times 10 \times 10} = 31.25 : 1$

Dimensions

The diagram below shows the dimensions of the 20D mm line of metal gearmotors (units are mm over [inches]).

Dimensions of the Pololu 20D mm metal gearmotors. Units are mm over [inches]. This diagram only applies to the listed gear ratios.

Gearmotor accessories

The gearmotor face plate has two mounting holes threaded for M2.5 screws, and you can use our custom-designed 20D mm metal gearmotor bracket (shown in the left picture below) to mount the gearmotor to your project via these mounting holes and the screws that come with the bracket.

Pololu 20D mm metal gearmotor bracket pair with included hardware.

20D mm metal gearmotor with a univeral aluminum mounting hub and mounted on a 20D mm metal gearmotor 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 70×8mm wheel mounted to a 20D mm metal gearmotor using a universal aluminum mounting hub for 4mm shafts.

A 20D mm gearmotor connected to a scooter wheel by the 4 mm scooter wheel adapter.

These motors also work with the hex adapters included with the 120mm-diameter Wild Thumper wheels (the left picture below shows a 20D mm gearmotor while the right picture shows a larger 25D mm gearmotor):

Dagu Wild Thumper wheel 120×60mm (metallic red) with Pololu 20D mm metal gearmotor.

Dagu Wild Thumper wheel 120×60mm (chrome) with Pololu 25D 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.

You can use our magnetic encoder kit for 20D mm metal gearmotors to provide motor speed or position feedback. Please note that this kit only works on gearmotor versions that have an extended motor shaft.

Magnetic Encoder Kit for 20D mm Metal Gearmotors assembled on a 20D mm metal gearmotor with extended motor shaft.

Magnetic Encoder Kit for 20D mm Metal Gearmotors assembled on a 20D mm metal gearmotor with extended motor shaft.

We have a number of motor controllers and motor drivers that work with these 20D mm metal gearmotors. In particular, we recommend our MC33296-based motor drivers, for which we have basic single and dual carriers and a dual-channel shield for Arduino. Our VNH5019-based motor drivers (available as single and dual carriers) also work well with these motors, and because they can handle higher currents, they will run much cooler than the MC33926 carriers. If you are looking for higher-level control interfaces, such as USB, RC, analog voltages, or serial, consider our SMC 18v7, Jrk 21v3, or TReX Jr.