When 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 can be unevenly distributed over the planetary gears and the drive teach operates less smoothly. Also, gear life can be shortened. These alignment changes require skills that aren’t normally obtainable in the field.
Achieving a larger speed reduction ratio takes a smaller sun gear diameter (or an exceptionally large ring equipment). This smaller sun servo reducer equipment is usually integral using its shaft, which should be smaller aswell, thereby reducing its strength and its own torque or load capability.

Several types of gear trains, including those with planetary gears, are commonly used to acquire this optimum reduction ratio. Planetary gear trains offer high stiffness and low backlash (needed for accurate operation), plus even load distribution (to acquire optimum torque). Some planetary versions combine external-tooth pinion-and-gear units with planetary equipment sections to simplify installation and boost acceleration. These hybrid gearheads are described later.
A simple planetary gearhead has some limitations regarding simple installation, load capacity, and speed, all of which are related to the sun gear.

Generally, the designer usually obtains the the best speed reduction ratio by matching the inertia of the engine and gearbox with the inertia of the driven load. This inertia coordinating minimizes power loss 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 need a servo drive – this uses the feedback data to precisely control the positioning of the motors direction and rotation distance.
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Servomotor selection usually begins with the designer seeking to reduce the motor size by using a gearbox to reduce speed and enhance torque. Speed reduction allows rapid acceleration and deceleration of large loads utilizing a small, less costly motor.