Whenever a conventional planetary gearhead is mounted to a motor, the sun gear must be aligned to pay for runout error of the servomotor shaft. Without proper alignment, load is usually unevenly distributed over the planetary gears and the drive train operates less efficiently. Also, gear life could be shortened. These alignment adjustments require skills that are not normally obtainable in the field.
Achieving a more substantial speed reduction ratio requires a smaller sun equipment diameter (or an exceedingly large ring gear). This smaller sun equipment is usually integral with its shaft, which should be smaller as well, thereby reducing its power and its torque or load capacity.

Various kinds gear trains, including people that have planetary gears, are commonly used to acquire this the best reduction ratio. Planetary gear trains provide high stiffness and low backlash (necessary for accurate operation), plus actually load distribution (to obtain maximum torque). Some planetary variations combine external-tooth pinion-and-gear pieces with planetary gear sections to simplify set up and boost speed. These hybrid gearheads are referred to later.
A basic planetary gearhead has a few limitations regarding simple installation, load capacity, and speed, all of which are related to the sun gear.

As a rule, the designer usually obtains the the best possible speed reduction ratio by matching the inertia of the engine and gearbox with the inertia of the driven load. This inertia matching minimizes power reduction in the motor, which makes it run more efficiently.

Servo motors deliver precise control of placement, velocity, and acceleration in the closed-loop systems of servomechanisms. Servo motors require a servo drive – this uses the opinions data to exactly control the position of the motors path and rotation distance.
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Servomotor selection usually starts with the designer seeking to reduce the engine size by utilizing a gearbox to lessen speed and increase torque. Speed decrease allows quick acceleration and deceleration of huge loads using a small, less expensive motor.