low backlash gearbox

Perhaps the most obvious is to increase precision, which 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, be prepared to spend more for quieter, smoother gears.
Don’t make the mistake of over-specifying the motor. Remember, the insight pinion on the planetary must be able manage the motor’s result torque. Also, if you’re using a multi-stage gearhead, the output stage must be strong enough to soak up the developed torque. Obviously, using a better motor than required will require a larger and more costly gearhead.
Consider current limiting to safely impose limits on gearbox size. With servomotors, output torque is usually a linear function of current. Therefore besides protecting the gearbox, current limiting also shields the motor 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 simultaneously in mesh. Although you can’t really totally get rid of noise from such an assembly, there are several methods to reduce it.

As an ancillary benefit, the geometry of planetaries matches the form of electric motors. Hence the gearhead could be close in diameter to the servomotor, with the output shaft in-line.
Highly rigid (servo grade) gearheads are generally more expensive than lighter duty types. However, for rapid acceleration and deceleration, a servo-grade gearhead may be the only wise choice. In this kind of applications, the gearhead could be viewed as a mechanical springtime. The torsional deflection caused by the spring action adds to backlash, compounding the effects of free shaft movement.
Servo-grade gearheads incorporate many construction features to minimize torsional stress and deflection. Among the more common are large diameter result shafts and beefed up support for satellite-gear shafts. Stiff or “rigid” gearheads tend to be the costliest of planetaries.
The type of bearings supporting the output shaft depends on the load. High radial or axial loads usually necessitate rolling element bearings. Small planetaries can often get by with low-price sleeve bearings or additional economical types with relatively low axial and radial load ability. For bigger and servo-grade gearheads, heavy duty result shaft bearings are usually required.
Like the majority of gears, planetaries make sound. And the faster they run, the louder they get.

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