Which component is essential in a basic servo system alongside the servo amplifier and feedback?

In a basic servo system, the essential components work together to regulate and control the position, velocity, and acceleration of an output actuator. Alongside the servo amplifier and feedback mechanism, the output actuator plays a critical role. It is responsible for translating the electrical signals processed by the servo amplifier into physical motion.

The servo amplifier receives feedback, which provides real-time data about the position and performance of the output actuator. This feedback allows the system to make precise adjustments, ensuring that the output actuator moves to the desired position with accuracy. By responding to the control signals and feedback, the output actuator effectively completes the control loop within the servo system, making it indispensable for functionality.

While the other components mentioned, such as a control panel, synchro-control system, or power supply, can play supporting roles, the output actuator is fundamentally necessary to achieve the intended physical performance dictated by the servo system.