1. Design of the servo deceleration transmission chain depending on steady movement, frequent start and stop and strong dynamic performance may be based on the idea of least equivalent transmission inertia and minimum output shaft angle error. Using irreducible ratios at all levels helps gear transmission systems with different loads to prevent simultaneous meshing.
2. Design of the down-speed gear transmission chain may be based on the idea of least error of the rotation angle of the output shaft because it mostly enhances the transmission accuracy and lowers the return error. Should it be a speed-increasing transmission chain, it should be raised initially on the few levels.
3. Combining the planetary gear train with the fixed shaft gear train helps the gear transmission chain with a high transmission ratio.
4. Design may be based on the idea of lightest weight for the speed reduction transmission chain needing the lowest feasible weight.
