When 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 can be unevenly distributed over the planetary gears and the drive train operates less smoothly. Also, gear life could be shortened. These alignment modifications require servo reducer skills that are not normally obtainable in the field.
Achieving a more substantial speed reduction ratio takes a smaller sun equipment diameter (or an exceptionally large ring gear). This smaller sun gear is usually integral with its shaft, which should be smaller as well, thereby reducing its strength and its torque or load capability.
Several types of gear trains, including people that have planetary gears, are generally used to acquire this maximum reduction ratio. Planetary gear trains offer high stiffness and low backlash (necessary for accurate procedure), plus actually load distribution (to acquire maximum torque). Some planetary versions combine external-tooth pinion-and-gear sets with planetary equipment sections to simplify set up and boost acceleration. These hybrid gearheads are referred to later.
A simple planetary gearhead has some limitations regarding ease of installation, load capacity, and speed, which are related to sunlight gear.
Generally, the designer usually obtains the maximum speed decrease ratio by matching the inertia of the engine and gearbox with the inertia of the driven load. This inertia coordinating minimizes power reduction in the motor, making it run more efficiently.
Servo motors deliver precise control of placement, velocity, and acceleration in the closed-loop systems of servomechanisms. Servo motors need a servo drive – this uses the feedback data to specifically control the positioning of the motors direction and rotation distance.
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Servomotor selection usually begins with the designer wanting to reduce the electric motor size by utilizing a gearbox to reduce 
speed and increase torque. Speed reduction allows quick acceleration and deceleration of large loads using a small, less costly motor.