Planetary gear reducer is also called planetary reducer, servo reducer. In the reducer family, planetary reducers are widely used in drive systems such as servo motors, stepping motors, and DC motors due to their small size, high transmission efficiency, wide reduction range, and high precision. Its function is to reduce the speed, increase the torque and reduce the load/motor moment of inertia ratio under the premise of ensuring precise transmission.

The main transmission structure of the planetary gear reducer is: planetary gear, sun gear, ring gear and planet carrier.