The main transmission structure of planetary reducer is: planetary gear, sun gear, external ring gear. 
Planetary reducer due to structural reasons, the minimum single-stage reduction is 3, the maximum is generally not more than 10, the common reduction ratio is: 3.4.5.6.8.10, the number of reducer stages generally does not exceed 3, but some large reduction ratio custom reducers have 4-stage deceleration.
Compared with other reducers, planetary reducers have the characteristics of high rigidity, high precision (single stage can achieve less than 1 point), high transmission efficiency (single stage in 97%-98%), high torque/volume ratio, lifelong maintenance-free and so on.
Because of these characteristics, planetary reducers are mostly installed on stepper motors and servo motors to reduce speed, increase torque, and match inertia.
The rated input speed of the deceleration stepper motor can reach up to 18000rpm (related to the size of the reducer itself, the larger the reducer, the smaller the rated input speed), the output torque of industrial-grade planetary reducer generally does not exceed 2000Nm, and the special super torque planetary reducer can achieve more than 10000Nm. The operating temperature is generally around -25 °C to 100 °C, and its operating temperature can be changed by changing the grease.
The internal gear of the planetary reducer adopts 20CrMnTi carburized quenching and grinding teeth, which has the characteristics of small size, light weight, high bearing capacity, long service life, stable operation, low noise, large output torque, large speed ratio, high efficiency and safe performance. It has the characteristics of power shunt and multi-tooth meshing and unique use. It is a new type of reducer with wide versatility. The maximum input power can reach 104kW.
Planetary reducer is suitable for lifting and transportation, engineering machinery, metallurgy, mining, petrochemical, construction machinery, light industry and textile, medical equipment, instrumentation, automobiles, ships, weapons and aerospace and other industrial sectors planetary series new varieties WGN fixed shaft transmission reducer, WN sub-mother gear transmission reducer, elastic load less tooth difference reducer.
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