Pololu's 20D, 25D and 37D mm metal gearmotors, from their own CAD. The diameter picks the motor; the 20D also comes with a short output shaft, standing 10.7 mm out instead of 18. The gear ratio picks the gearbox — Pololu draw one model per gearbox, so the ratios it covers are the same object — and the back of the motor is bare, the motor shaft brought out for an encoder on the 20D, or an encoder board on the 25D (48 CPR) and the 37D (64 CPR). The 20D is a 4 mm D-shaft with two M2.5 face mounts 15 mm apart, the 25D a 4 mm D-shaft with two M3 face mounts 17 mm apart, and the 37D a 6 mm D-shaft with six M3 mounts on a 31 mm bolt circle, the shaft 7 mm off that circle's centre.

Made by

Pololu

Kind

3D model

Licence

CC-BY-SA-4.0

Keywords

motor, gearmotor, pololu, actuator, drive, metal, 20d, 25d, 37d, ratio, encoder, quadrature, extended, short, dc motor