When a conventional planetary gearhead is mounted to a engine, the sun gear must be aligned to pay for runout error of the servomotor shaft. Without proper alignment, load is certainly unevenly distributed over the planetary gears and the drive teach operates less smoothly. Also, gear life could be shortened. These alignment changes require skills that are not normally obtainable in the field.
Achieving a more substantial speed reduction ratio requires a smaller sun gear diameter (or an exceptionally large ring gear). This smaller sun gear is usually integral with its shaft, which should be smaller aswell, thereby reducing its power and its own torque or load capability.
Various kinds gear trains, including those with planetary gears, are generally used to acquire this the best reduction ratio. Planetary equipment trains offer high stiffness and low backlash (needed for accurate operation), plus also load distribution (to obtain maximum torque). Some planetary versions combine external-tooth pinion-and-gear units with planetary equipment sections to simplify installation and boost quickness. These hybrid gearheads are described later.
A basic planetary gearhead has several limitations regarding ease of installation, load capacity, and speed, all of which are related to sunlight gear.
Generally, the designer usually obtains the ideal 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, 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 need 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 begins with the designer seeking to reduce the engine size by utilizing a gearbox to lessen speed and servo motor and gearbox enhance torque. Speed reduction allows fast acceleration and deceleration of huge loads using a small, less expensive motor.