Whenever a conventional planetary gearhead is mounted to a engine, 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 train operates less smoothly. Also, gear life can be shortened. These alignment adjustments require skills that aren’t normally obtainable in the field.
Achieving a more substantial speed servo motor and gearbox reduction ratio takes a smaller sun equipment diameter (or an exceptionally large ring equipment). This smaller sun equipment is usually integral with its shaft, which should be smaller as well, 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 maximum reduction ratio. Planetary gear trains provide high stiffness and low backlash (necessary for accurate operation), plus also load distribution (to acquire optimum torque). Some planetary versions combine external-tooth pinion-and-gear pieces with planetary gear sections to simplify installation and boost speed. These hybrid gearheads are defined later.
A basic 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 maximum 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 reduction 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 require a servo drive – this uses the feedback data to specifically control the position of the motors path and rotation distance.
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Servomotor selection usually starts with the designer seeking to reduce the electric motor size by using a gearbox to lessen speed and increase torque. Speed reduction allows quick acceleration and deceleration of large loads utilizing a small, less expensive motor.