Whenever 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 is definitely 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 equipment diameter (or an exceptionally large ring gear). This smaller sun gear is servo reducer usually integral with its shaft, which must be smaller aswell, 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 optimum torque). Some planetary versions combine external-tooth pinion-and-gear pieces with planetary equipment sections to simplify installation and boost rate. These hybrid gearheads are explained later.
A basic planetary gearhead has some limitations regarding ease of installation, load capacity, and speed, all of which are related to sunlight gear.
Generally, the designer usually obtains the the best possible 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 position, velocity, and acceleration in the closed-loop systems of servomechanisms. Servo motors need a servo drive – this uses the feedback data to exactly control the position of the motors direction and rotation distance.
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Servomotor selection usually starts with the designer seeking to reduce the electric motor size by utilizing a gearbox to reduce speed and enhance torque. Speed decrease allows quick acceleration and deceleration of huge loads utilizing a small, less costly motor.