SainSmart 29:1 Metal Gearmotor 37Dx52L mm with 64 CPR Encoder 12V 365rpm

Introduction



This 2.54" × 1.45" × 1.45" gearmotor is a powerful 12V brushed DC motor with a
29:1 metal gearbox and an integrated quadrature encoder that provides a
resolution of 64 counts per revolution of the motor shaft, which corresponds to
1856 counts per revolution of the gearbox's output shaft. These units have a
0.61"-long, 6 mm-diameter D-shaped output shaft.

This powerful brushed DC gearmotor is available in six different gear ratios and
features an integrated quadrature encoder with 64 counts per revolution (CPR) of
the motor shaft.



Gearmotor Dimensions



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 neighboring holes are 15.5 mm apart. You can use our custom 37D 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.



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. To compute the counts
per revolution of the gearbox output, multiply the gear ratio by 64.