Which type of actuator is commonly used in soft start applications?

In soft start applications, pneumatic cylinders with built-in speed controls are frequently utilized. The primary reason for this choice is their ability to regulate the speed of the cylinder's extension and retraction. This feature allows for smoother acceleration and deceleration, thereby minimizing the mechanical stress on the connected parts and reducing the potential for abrupt movements that can lead to wear or damage.

These controlled motions are particularly advantageous in applications where precision and gradual force application are critical, such as in assembly lines or robotic systems. They also help in preventing sudden surges of air pressure or flow that could adversely affect the operation of the system.

In contrast, pneumatic cylinders without controls lack the ability to manage speed effectively and thus can lead to harsh starts and stops, which is undesirable in soft start scenarios. Electric motors, while versatile, are not the primary choice for pneumatic soft starts, as their operation differs significantly from that of pneumatic systems. Lastly, rotary actuators typically do not address the linear motion requirements that are often necessary in applications needing soft starts, which further differentiates them from the optimal choice in this context.