AB series precision planetary reducer is another term for planetary reducers in the industry. Its main transmission structure is: planetary gear, sun gear, and internal gear ring. Compared to other reducers, precision planetary reducers have the characteristics of high rigidity, high precision (up to 1 point per stage), high transmission efficiency (97% -98% per stage), high torque/volume ratio, and lifetime maintenance free. Most of them are installed on stepper motors and servo motors to reduce speed, increase torque, and match inertia.