Whenever a conventional planetary gearhead is mounted to a electric motor, the sun gear should be aligned to compensate for runout error of the servomotor shaft. Without proper alignment, load is usually unevenly distributed over the planetary gears and the drive teach operates less smoothly. Also, gear life could be shortened. These alignment adjustments require skills that aren’t normally servo motor and gearbox available in the field.
Achieving a larger speed reduction ratio takes a smaller sun equipment 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 power and its own torque or load capability.
Various kinds gear trains, including people that have planetary gears, are generally used to obtain this the best reduction ratio. Planetary gear trains offer high stiffness and low backlash (needed for accurate operation), plus even load distribution (to obtain optimum torque). Some planetary versions combine external-tooth pinion-and-gear sets with planetary gear sections to simplify installation and boost rate. These hybrid gearheads are explained later.
A simple planetary gearhead has some limitations regarding simple installation, load capacity, and speed, which are related to the sun gear.
Generally, the designer usually obtains the the best speed decrease ratio by matching the inertia of the motor and gearbox with the inertia of the driven load. This inertia matching minimizes power reduction in the motor, which makes 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 exactly control the position of the motors direction and rotation distance.
Cone Drive’s stainless steel precision movement gearboxes are made for sterile manufacturing environments. The product’s smooth surface area and curved contour permits easy cleaning and bacteria-free surfaces, ideal for food digesting and pharmaceutical applications. The product is designed and rated to IP69k providing maximum safety against contaminant ingress and also leak free operation.
Servomotor selection usually starts with the designer wanting to reduce the electric motor size by using a gearbox to reduce speed and boost torque. Speed reduction allows fast acceleration and deceleration of large loads utilizing a small, less costly motor.