19:1 Metal Gearmotor 37Dx68L mm 24V with 64 CPR Encoder (Helical Pinion)

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  • Pololu-4691
  • 4691
Overview Measuring 37 mm (1.46″) in diameter, these brushed DC gearmotors are the...more
Product information "19:1 Metal Gearmotor 37Dx68L mm 24V with 64 CPR Encoder (Helical Pinion)"

Overview

Measuring 37 mm (1.46″) in diameter, these brushed DC gearmotors are the largest and most powerful we carry. They are available in a range of gear ratios from 6.3:1 to 150:1 and with 12 V or 24 V motors, and all versions are available with integrated 64 CPR quadrature encoders on the motor shafts. The 12 V and 24 V motors offer approximately the same performance at their respective nominal voltages, with the 24 V motor drawing half the current of the 12 V motor. See the 37D metal gearmotor datasheet (2MB pdf) for more information, including detailed performance graphs for each gearmotor version. You can also use our dynamically sortable 37D gearmotor comparison table to search for the version that offers the best combination of speed, torque, and current draw for your particular application.

In general, these kinds of motors can run at voltages above and below the nominal voltages; lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor.

Details for item #4691

This gearmotor is a powerful 24V brushed DC motor with a 18.75:1 metal gearbox and an integrated quadrature encoder that provides a resolution of 64 counts per revolution of the motor shaft, which corresponds to 1920 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:

voltageno-load performancestall extrapolation
24 V 530 RPM, 100 mA 9.5 kg⋅cm (130 oz⋅in), 3 A

Exact gear ratio: 25×30×3010×10×12=18.75:125×30×3010×10×12=18.75:1

Dimensions

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

This diagram is also available as a downloadable PDF (459k pdf).

Dimensions

Size: 37D × 68L mm1
Weight: 200 g
Shaft diameter: 6 mm2

General specifications

Gear ratio: 18.75:1
No-load speed @ 24V: 530 rpm
No-load current @ 24V: 0.1 A
Stall current @ 24V: 3 A3
Stall torque @ 24V: 9.5 kg·cm3
Max output power @ 24V: 13 W
No-load speed @ 12V: 270 rpm4
No-load current @ 12V: 0.08 A4
Stall current @ 12V: 1.7 A4
Stall torque @ 12V: 5.2 kg·cm4
Motor type: 24V

Performance at maximum efficiency

Max efficiency @ 24V: 52 %
Speed at max efficiency: 450 rpm
Torque at max efficiency: 1.3 kg·cm
Current at max efficiency: 0.49 A
Output power at max efficiency: 6.1 W

General specifications

Lead length: 20 cm5
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 12 V but is intended for operation at 24 V.
5) May vary by a few centimeters.
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