Radwell International’s Blog

When deciding between fluid-driven and electromechanical linear actuators, close consideration of long-term benefits to the intended end user can help original equipment manufacturer (OEM) system designers maximize both product value and return on investment (ROI).

Fluid-driven actuators translate electric energy motion through a column of air, gas, oil or other media. While the motion they provide is simpler than with other type actuators, the infrastructure required to support them is not. Hydraulic actuators require an external system of pumps and valves; Pneumatic actuators require complex air delivery systems. For both, stroke length is defined by a mechanical hard stop.

What is an Actuator?

An actuator is the main component of a mechanical device that allows the device to move. This movement can be in two forms, one being linear the other being rotary. Linear movement means it can move back and forth on a set path in a straight motion. Rotary movement means movement in a rotational fashion. These two types of movement allow for actuators to be broken down into a linear actuator and a rotary actuator.

A servo motor is a rotary actuator or linear actuator that allows for angular position, acceleration and velocity. It has capabilities that a regular motor doesn’t possess. Servo motors work with sensors for precise control of movement. The controller is the most sophisticated part of the servo motor, as it is designed for precision.

Servo motors are a combination of specific parts, which include a DC or AC motor, and are suitable for use in a closed-loop control system. Servo motor applications include robotics, automated manufacturing and computer numerical control (CNC) machining applications.

The two types of servo motors have different uses. AC Servo motors can handle higher current surges and tend to be used in industrial machinery.