This gearmotor is a powerful 12V brushed DC motor with a 70:1 metal gearbox and an integrated quadrature encoder that provides a resolution of 64 counts per revolution of the motor shaft, which corresponds to 4480 counts per revolution of the gearbox’s output shaft. These units have a 0.61"-long, 6 mm-diameter D-shaped output shaft.
Key specs at 12 V: 150 RPM and 300 mA free-run, 200 oz-in (14 kg-cm) and 5 A stall.
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.
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 color-coded, 11" (28 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:
|Red||motor power (connects to one motor terminal)|
|Black||motor power (connects to the other motor terminal)|
|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.
|Size:||37D x 70L mm1|
|Shaft diameter:||6 mm|
|Free-run speed @ 6V:||75 rpm2|
|Free-run current @ 6V:||250 mA2|
|Stall current @ 6V:||2500 mA2|
|Stall torque @ 6V:||100 oz·in2|
|Free-run speed @ 12V:||150 rpm|
|Free-run current @ 12V:||300 mA|
|Stall current @ 12V:||5000 mA|
|Stall torque @ 12V:||200 oz·in|
|Lead length:||11 in|
- 1 Length measurement does not include gearbox shaft or the raised area immediately around it.
- 2 This motor will run at 6 V but is intended for operation at 12 V.
|Part. No. :||2825|
|Shaft Diam. mm :||6|
Questions on 2825 - 70:1 Metal Gearmotor 37Dx70L mm with 64 CPR Encoder
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