Such an actuator converts the rotational energy of the motor into a straight movement using a cam or a lead bar device. The screw example is a very popular choice because it provides a wide range of extended length potentials.
The motor passes the threaded screw through a nut attached to the actuator arm. The nut and the actuator cannot rotate, so when the screw is rotated, the upper and lower movement provide a linear motion cam type linear actuator to connect to the actuator arm through a series of link mechanisms or cam surfaces using a eccentric cam.
When the cam is rotated, it pushes the actuator arm forward or backward. This type of actuator does not have a wide range of motion, but can be entered very accurately. Cam actuators typically use electron-step motors, which increases the accuracy required to advance and improve precision process control.
