A position encoder is used to detect the location of an actuator and send a signal to a controller.

• A. True
• B. False
• C. Not always used
• D. Only with hydraulic systems

Answer: (A)

Position feedback is essential for precise motion control. A position encoder provides that feedback by converting the actuator’s physical position into an electrical signal that the controller reads. In rotary form, it measures angle; in linear form, it measures displacement. The controller uses this information to compare the actual position with the desired position and adjust the actuator to achieve accurate, repeatable movement. This closed-loop feedback is a common way to achieve high precision in robotics and automation, which is why a position encoder is typically used to detect location and send the signal to the controller. Some systems may use other sensors or have no feedback, and hydraulic setups can still employ encoders, but the core idea remains: the encoder supplies real-time position information to guide control.