10:1 Metal Gearmotor 37Dx65L mm 12V with 64 CPR Encoder (Helical Pinion)

This gearmotor is a powerful 12V brushed DC motor with a 10:1 metal gearbox and an integrated quadrature encoder that provides a resolution of 64 counts per revolution of the motor shaft, which corresponds to 640 counts per revolution of the gearbox’s output shaft.

AUD$ 57.95

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We can ship 37 more in 7 days

Our Code: SKU-005984

Supplier Link: [Pololu MPN:4758]


Description

Overview

These powerful brushed DC gearmotor are available in a variety of different gear ratios and feature integrated quadrature encoders with 64 counts per revolution (CPR) of the motor shaft. The motor and encoder portion is available by itself (no gearbox), and versions without the encoder are also available.

Rated
Voltage
Stall
Current
No-Load
Current
Gear Ratio No-Load Speed
(RPM)
Extrapolated
Stall Torque
Max Power
(W)


Without Encoder


With Encoder
(kg ⋅ cm) (oz ⋅ in)
12 V 5.5 A 0.15 A 1:1 (no gearbox) 10,000 0.5 7 item #4750
6.3:1 1600 3.0 42 12 item #4747 item #4757
10:1 1000 4.9 68 12 item #4748 item #4758
19:1 540 8.5 120 12 item #4741 item #4751
30:1 330 14 190 12 item #4742 item #4752
50:1 200 21 290 10 item #4743 item #4753
70:1 150 27 380 10 item #4744 item #4754
100:1 100 34 470 8 item #4745 item #4755
131:1 76 45 630 6 item #4746 item #4756
150:1 67 49 680 6 item #2829 item #2828

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 10 kg-cm (150 oz-in), and the recommended upper limit for instantaneous torque is 25 kg-cm (350 oz-in). Stalls can also result in rapid (potentially on the order of seconds) thermal damage to the motor windings and brushes; a general recommendation for brushed DC motor operation is 25% or less of the stall current.

These motors are intended for use at 12 V, though in general, these kinds of motors can run at voltages above and below the nominal voltage (they can begin rotating at voltages as low as 1 V). Lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor.

The gearboxes are composed mainly of spur gears, but they feature helical gears for the first stage for reduced noise and improved efficiency:

37D Gearmotor (Helical Pinion) with the gearbox removed showing the helical pinion gear and first mating gear.

The encoder portion is protected by a black plastic end cap:

The end cap is easily removable if you need to access the encoder or want to slightly reduce the overall gearmotor size, but there is a little bit of base plastic that will remain, as shown in the pictures below:

37D mm metal gearmotor with 64 CPR encoder (with end cap removed).

37D mm metal gearmotor with 64 CPR encoder (with end cap removed). (2) (2)

Details for item #4758

10:1 Metal Gearmotor 37Dx65L mm 12V with 64 CPR Encoder (Helical Pinion).

10:1 Metal Gearmotor 37Dx65L mm 12V with 64 CPR Encoder (Helical Pinion). (1)

10:1 Metal Gearmotor 37Dx65L mm 12V with 64 CPR Encoder (Helical Pinion). (2) (2)

This gearmotor is a powerful 12V brushed DC motor with a 10:1 metal gearbox and an integrated quadrature encoder that provides a resolution of 64 counts per revolution of the motor shaft, which corresponds to 640 counts per revolution of the gearbox’s output shaft. The gearbox is composed mainly of spur gears, but it features helical gears for the first stage for reduced noise and improved efficiency. These units have a 16 mm-long, 6 mm-diameter D-shaped output shaft. This gearmotor is also available without an encoder.

Key specifications:

voltage no-load performance stall extrapolation
12 V 1000 RPM, 150 mA 4.9 kg⋅cm (68 oz⋅in), 5.5 A

Exact gear ratio: ``(25×40) / (10×10) = bb(10:1)``

Dimensions

Dimensions of the 37D mm metal gearmotor with 64 CPR encoder. Units are mm over [inches].

This diagram is also available as a downloadable PDF (461k pdf).

Warning: Do not screw too far into the mounting holes as the screws can hit the gears. We recommend screwing no more than 3mm (0.12″) into the screw hole.

37D mm metal gearmotor with 64 CPR encoder (with end cap removed). (1)

The 25D and 37D mm metal gearmotors with encoders have cables that are terminated with a 6-pin, 0.1″-pitch female connector.

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 64 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 64. The motor/encoder has six colour-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:

Colour Function
Red motor power (connects to one motor terminal)
Black motor power (connects to the other motor terminal)
Green encoder GND
Blue encoder Vcc (3.5 – 20 V)
Yellow encoder A output
White encoder 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. The following oscilloscope capture shows the A and B (yellow and white) encoder outputs using a motor voltage of 12 V and a Hall sensor Vcc of 5 V:

Encoder A and B outputs for 37D mm metal gearmotor with 64 CPR encoder (motor running at 12 V).

By counting both the rising and falling edges of both the A and B outputs, it is possible to get 64 counts per revolution of the motor shaft. Using just a single edge of one channel results in 16 counts per revolution of the motor shaft, so the frequency of the A output in the above oscilloscope capture is 16 times the motor rotation frequency.

Gearmotor accessories

The face plate has six mounting holes evenly spaced around the outer edge threaded for M3 screws. These mounting holes form a regular hexagon and the centers of neighbouring holes are 15.5 mm apart. We carry two brackets for these gearmotors: a stamped aluminium L-bracket (sold in pairs) and a sturdier, tombstone-style machined aluminium bracket (sold individually):

37D mm gearmotor (without encoder) with L-bracket and 6mm universal mounting hub. (2) (2)

Pololu machined aluminium bracket for 37D mm metal gearmotors mounting a motor to a clear piece of acrylic.

The 6 mm diameter gearbox output shaft works with the Pololu universal aluminium mounting hub for 6mm shafts, which can be used to mount our larger Pololu wheels (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 6mm scooter wheel adaptor to mount many common scooter, skateboard, and inline skate wheels to the gearmotor’s output shaft as shown in the right picture below:

37D mm metal gearmotor with 64 CPR encoder connected to a Pololu 90×10mm wheel with a Pololu universal mounting hub.

A 37D mm gearmotor connected to a scooter wheel by the 6 mm scooter wheel adaptor.

For a general-purpose hex adaptor, consider our 12mm hex wheel adaptor (also available in an extended version), which lets you use these motors with many common hobby RC wheels, including Dagu Wild Thumper Wheels:

12mm Hex Wheel Adaptor for 6mm Shaft connecting a Wild Thumper Wheel to a 37D mm Metal Gearmotor.

We have a number of motor drivers and motor controllers that work with these 37D mm metal gearmotors. We generally recommend our High-Power Motor Drivers, which are available in various power levels and versions, including some dual-channel shields for Arduino and dual-channel expansion boards for Raspberry Pi. Additionally, our VNH5019-based motor drivers, which are also available as single and dual carriers, are a good match for these gearmotors.

Pololu Dual G2 High-Power Motor Driver 24v14 Shield for Arduino.

Pololu Dual G2 High-Power Motor Driver 24v14 for Raspberry Pi (assembled version) with included hardware.

Pololu dual VNH5019 motor driver shield for Arduino.

If you are looking for higher-level control interfaces, such as USB, RC, analogue voltages, I²C, or TTL serial, consider our Simple Motor Controllers, Jrk motor controllers, or RoboClaw motor controllers; these controllers are available in various power levels several of which can handle these 37D mm metal gearmotors (we generally recommend a motor controller that can handle continuous currents above the stall current of your motor).

High-Power Simple Motor Controller G2 18v15.

Jrk G2 21v3 USB Motor Controller with Feedback.

RoboClaw 2×7A Motor Controller (V5B) in its included case.

We have an assortment of Hall effect-based current sensors to choose from for those who need to monitor motor current:

ACS711EX current sensor carrier -15.5A to +15.5A.

ACS714 current sensor carrier -5A to +5A.

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.


Specifications

Dimensions

Size: 37D × 65L mm1
Weight: 190 g
Shaft diameter: 6 mm2

General specifications

Gear ratio: 6.25:1
No-load speed @ 12V: 1600 rpm
No-load current @ 12V: 0.15 A
Stall current @ 12V: 5.5 A3
Stall torque @ 12V: 3.0 kg·cm3
Max output power @ 12V: 12 W
No-load speed @ 6V: 800 rpm4
No-load current @ 6V: 0.1 A4
Stall current @ 6V: 3.0 A5
Stall torque @ 6V: 1.5 kg·cm5

Performance at maximum efficiency

Max efficiency @ 12V: 48 %
Speed at max efficiency: 1300 rpm
Torque at max efficiency: 0.46 kg·cm
Current at max efficiency: 1.1 A
Output power at max efficiency: 6.0 W

General specifications

Lead length: 20 cm6
Encoders?: Y
Encoder resolution: 64 CPR

Notes:

1
Length measurement is from gearbox face plate to back of encoder cap (it does not include the output shaft). See dimension diagram for details.
2
D shaft.
3
Stalling is likely to damage the gearmotor. Stall parameters come from a theoretical extrapolation of performance at loads far from stall. As the motor heats up, as happens as it approaches an actual stall, the stall torque and current decrease.
4
This motor will run at 6 V but is intended for operation at 12 V.
5
Stalling is likely to damage the gearmotor. Stall parameters come from a theoretical extrapolation of performance at loads far from stall. This motor will run at 6 V but is intended for operation at 12 V.
6
May vary by a few centimeters.

Resources

File downloads

Datasheet for Pololu 37D Metal Gearmotors (1MB pdf)
Dimension diagrams of the Pololu 37D mm Metal Gearmotors (461k pdf)
3D models of 37D mm gearmotors (3MB zip)
This file contains 3D models (in the step file format) of the 37D mm gearmotors with and without encoders.

Recommended links

MATLAB script to plot motor performance curves for Pololu brushed DC gearmotors
This MATLAB script, written by Ali Asgher Mansoor Habiby, plots speed, power, current draw, and efficiency as they vary with torque when you input the gearmotor specifications. It also prints the resistance of the motor, and the current draw and torque at which maximum efficiency and maximum power occur.

FAQs

What material is the gearbox output shaft made of, and can I get the shaft customised?
The shaft is composed of hardened stainless steel. Some customisation is generally possible (e.g., different length or no D-shaft) for sufficiently high-volume orders. If this is something you are interested in, please email us.

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