When a conventional planetary gearhead is mounted to a engine, 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 train operates less efficiently. Also, gear life could be shortened. These alignment changes require skills that are not normally available in the field.
Achieving a larger speed reduction 
ratio takes a smaller sun equipment diameter (or an exceedingly large ring equipment). This smaller sun gear is usually integral with its shaft, which must be smaller as well, thereby reducing its strength and its own torque or load capacity.
Various kinds gear trains, including people that have planetary gears, are commonly used to obtain this the best possible reduction ratio. Planetary equipment trains provide high stiffness and low backlash (needed for accurate operation), plus also load distribution (to acquire maximum torque). Some planetary variations combine external-tooth pinion-and-gear pieces with planetary gear sections to simplify set up and boost rate. These hybrid gearheads are explained later.
A basic planetary gearhead has a few limitations regarding ease of installation, load capacity, and speed, all of which are related to the sun gear.
Generally, the designer usually obtains the the best possible speed decrease ratio by matching the inertia of the electric motor and gearbox with the inertia of the driven load. This inertia complementing 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 require a servo drive – this uses the feedback data to specifically control the position of the motors path and rotation distance.
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Servomotor selection usually begins with the designer seeking to reduce the electric motor size by using a gearbox to lessen speed and boost torque. Speed reduction allows speedy acceleration and deceleration of huge loads using a small, less servo reducer expensive motor.