When a conventional planetary gearhead is mounted to a electric motor, the sun gear must 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 train operates less efficiently. Also, gear life can be shortened. These alignment modifications require skills that are not normally available in the field.
Achieving a more substantial speed reduction ratio takes a smaller sun gear diameter (or an exceptionally large ring gear). This smaller sun equipment is usually integral with its shaft, which should be smaller aswell, thereby reducing its power and its torque or load capacity.
Several types of gear trains, including those with 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 maximum 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 simple 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 optimum speed reduction ratio by matching the inertia of the motor and gearbox with the inertia of the servo motor and gearbox driven load. This inertia complementing minimizes power reduction 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 feedback data to exactly control the positioning of the motors direction and rotation distance.
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Servomotor selection usually begins with the designer wanting to reduce the motor size by using a gearbox to reduce speed and increase torque. Speed reduction allows rapid acceleration and deceleration of large loads using a small, less costly motor.
