Perhaps the most apparent is to improve precision, which is a function of manufacturing and assembly tolerances, gear tooth surface finish, and the guts distance of the tooth mesh. Sound can be affected by gear and housing components as well as lubricants. In general, expect to spend 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. Also, if you’re using a multi-stage gearhead, the result stage must be strong enough to soak up the developed torque. Certainly, using a more powerful motor than required will require a madala tagasilöögiga käigukast larger and more expensive gearhead.
Consider current limiting to safely impose limits on gearbox size. With servomotors, output torque can be a linear function of current. So besides safeguarding the gearbox, current limiting also shields 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 it’s impossible to totally remove noise from this assembly, there are several ways to reduce it.
As an ancillary benefit, the geometry of planetaries fits the form of electric motors. Therefore the gearhead can be close in diameter to the servomotor, with the result shaft in-line.
Highly rigid (servo grade) gearheads are generally more costly than lighter duty types. However, for quick acceleration and deceleration, a servo-grade gearhead could be the only wise choice. In this kind of applications, the gearhead could be viewed as a mechanical springtime. The torsional deflection resulting from the spring action increases backlash, compounding the consequences of free shaft motion.
Servo-grade gearheads incorporate several construction features to reduce torsional stress and deflection. Among the more prevalent are large diameter result shafts and beefed up support for satellite-gear shafts. Stiff or “rigid” gearheads have a tendency to be the costliest of planetaries.
The kind of bearings supporting the output shaft depends on the strain. High radial or axial loads usually necessitate rolling component bearings. Small planetaries could get by with low-price sleeve bearings or additional economical types with fairly low axial and radial load capability. For bigger and servo-grade gearheads, durable result shaft bearings are usually required.
Like the majority of gears, planetaries make noise. And the quicker they run, the louder they get.
Low-backlash planetary gears are also available in lower ratios. Although some types of gears are generally limited to about 50:1 or more, planetary gearheads prolong from 3:1 (single stage) to 175:1 or even more, depending on the number of stages.