When a conventional planetary gearhead is mounted to a electric motor, the sun gear must be aligned to compensate for runout error of the servomotor shaft. Without proper alignment, load is certainly unevenly distributed over the planetary gears and the drive train operates less easily. Also, gear life can be shortened. These alignment modifications require skills that are not normally obtainable 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 equipment is usually integral with its shaft, which must be smaller as well, thereby reducing its strength and its own torque or load capability.
Various kinds gear trains, including those with planetary gears, are commonly used to obtain this optimum reduction ratio. Planetary gear trains offer high stiffness and low backlash (needed for accurate procedure), plus also load distribution (to acquire maximum torque). Some planetary versions combine external-tooth pinion-and-gear models with planetary gear sections to simplify set up and boost velocity. These hybrid gearheads are referred to later.
A basic planetary gearhead has some limitations regarding simple installation, load capacity, and speed, which are related to sunlight gear.
As a rule, the designer usually obtains the optimum speed reduction ratio by matching the inertia of the electric motor and gearbox with the inertia of the driven load. This inertia matching minimizes power loss in the motor, making it run more efficiently.
Servo motors deliver precise servo motor and gearbox 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 specifically control the positioning of the motors path and rotation distance.
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Servomotor selection usually begins with the designer wanting to reduce the motor size by using a gearbox to lessen speed and increase torque. 
Speed decrease allows quick acceleration and deceleration of huge loads using a small, less expensive motor.