Whenever a conventional planetary gearhead is mounted to a motor, the sun gear should be aligned to compensate for runout error of the servomotor shaft. Without proper alignment, load is definitely unevenly distributed over the planetary gears and the drive teach operates less efficiently. Also, gear life can be shortened. These alignment modifications require skills that aren’t normally obtainable in the field.
Achieving a larger speed reduction ratio takes a smaller sun equipment diameter (or an exceptionally large ring gear). This smaller sun gear is usually integral using its shaft, which should be smaller as well, thereby reducing its strength and its torque or load capability.

Various kinds gear trains, including those with planetary gears, are commonly used to obtain this the best reduction ratio. Planetary equipment trains provide high stiffness and low backlash (servo motor and gearbox needed for accurate operation), plus actually load distribution (to acquire optimum torque). Some planetary versions combine external-tooth pinion-and-gear units with planetary equipment sections to simplify installation and boost acceleration. These hybrid gearheads are referred to later.
A basic planetary gearhead has several limitations regarding ease of installation, load capacity, and speed, all of which are related to the sun gear.

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

Servo motors deliver precise control of position, 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 positioning of the motors path and rotation distance.
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Servomotor selection usually starts with the designer seeking to reduce the electric motor size by using a gearbox to lessen speed and enhance torque. Speed decrease allows quick acceleration and deceleration of large loads utilizing a small, less expensive motor.