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 can be unevenly distributed over the planetary gears and the drive teach operates less smoothly. Also, gear life can be shortened. These alignment changes require skills that aren’t normally available in the field.
Achieving a more substantial speed reduction ratio takes a smaller sun gear diameter (or an exceedingly large ring gear). This smaller sun gear is usually integral with its shaft, which must be smaller as well, thereby reducing its strength and its torque or load capacity.
Several types of gear trains, including those with planetary gears, are commonly used to acquire this maximum reduction ratio. Planetary gear trains provide high stiffness and low backlash (needed for accurate procedure), plus even load distribution (to acquire optimum torque). Some planetary versions combine external-tooth pinion-and-gear units with planetary gear servo reducer sections to simplify set up and boost acceleration. These hybrid gearheads are referred to later.
A simple planetary gearhead has several limitations regarding ease of installation, load capacity, and speed, all of which are related to the sun gear.
Generally, the designer usually obtains the maximum speed decrease ratio by matching the inertia of the motor and gearbox with the inertia of the driven load. This inertia complementing minimizes power reduction 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 feedback data to exactly control the positioning of the motors path and rotation distance.
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Servomotor selection usually begins with the designer seeking to reduce the engine size by utilizing a gearbox to 
lessen speed and boost torque. Speed reduction allows rapid acceleration and deceleration of huge loads using a small, less costly motor.