Perhaps the most obvious is to increase precision, which really is a function of manufacturing and assembly tolerances, gear tooth surface finish, and the center distance of the tooth mesh. Sound is also affected by gear and housing components as well as lubricants. In general, expect to pay more for quieter, smoother gears.
Don’t make the error of over-specifying the motor. Remember, the insight pinion on the planetary should be able handle the motor’s result torque. What’s more, if you’re utilizing a multi-stage gearhead, the output stage should be strong enough to absorb the developed torque. Obviously, using a more low backlash gearbox powerful motor than necessary will require a larger and more expensive gearhead.
Consider current limiting to safely impose limits on gearbox size. With servomotors, result torque can be a linear function of current. Therefore besides safeguarding the gearbox, current limiting also protects the engine and drive by clipping peak torque, which may be from 2.5 to 3.5 times continuous torque.

In each planetary stage, five gears are at the same time in mesh. Although you can’t really totally get rid of noise from this assembly, there are many ways to reduce it.

As an ancillary benefit, the geometry of planetaries fits the form of electric motors. Thus the gearhead could be close in diameter to the servomotor, with the result shaft in-line.
Highly rigid (servo grade) gearheads are usually more costly than lighter duty types. However, for speedy acceleration and deceleration, a servo-grade gearhead could be the only sensible choice. In this kind of applications, the gearhead may be viewed as a mechanical spring. The torsional deflection caused by the spring action adds to backlash, compounding the effects of free shaft motion.
Servo-grade gearheads incorporate several construction features to minimize torsional stress and deflection. Among the more prevalent are large diameter result shafts and beefed up support for satellite-equipment shafts. Stiff or “rigid” gearheads tend to be the costliest of planetaries.
The type of bearings supporting the output shaft depends upon the strain. High radial or axial loads generally necessitate rolling component bearings. Small planetaries could manage with low-cost sleeve bearings or various other economical types with fairly low axial and radial load capacity. For larger and servo-grade gearheads, heavy duty result shaft bearings are often required.
Like most gears, planetaries make sound. And the faster they operate, the louder they obtain.

Low-backlash planetary gears are also obtainable in lower ratios. Although some types of gears are generally limited to about 50:1 or more, planetary gearheads expand from 3:1 (one stage) to 175:1 or more, depending on the number of stages.