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What is the difference between a gear reducer and a planetary gear reducer?

Update:14-01-2023
Summary:...
What is a gear reducer?
The gear reducer is a planetary drive principle and adopts gear meshing. This kind of reducer has replaced two-stage and three-stage ordinary cylindrical gear reducers and cylindrical worm reducers in most cases. It has the following characteristics:
1. Large driving ratio. The drive ratio is .
2. Driving efficiency.
3. Compact structure, small size and light weight.
4. Few faults and long service life. The main drive meshing parts are made of bearing steel grinding, so the mechanical properties and wear resistance are good, and because of rolling friction, there are few failures and long life.
5. The operation is stable and reliable. Due to the multi-tooth meshing in the driving process, the operation is stable and reliable, and the noise is low.
6. Easy disassembly and assembly, easy maintenance.
7. Strong overload capacity, impact resistance, small moment of inertia, suitable for frequent starting and forward and reverse operation.
The main driving structure of the planetary gear reducer is: planetary gear, sun gear, outer ring gear. Due to the structure of the planetary reducer, the minimum single-stage reduction is 3, and the maximum is generally not more than 10. The common reduction ratio is: 3.4.5.6.8.10. The number of stages of the reducer generally does not exceed 3, but some customized reducers with large reduction ratios have 4 levels of deceleration. Compared with other reducers, the planetary reducer has the characteristics of rigidity, precision, driving efficiency, excellent torque/volume ratio, and maintenance-free for life. Because of these characteristics, most planetary reducers are installed on stepper motors and servo motors to reduce speed, increase torque, and match inertia.