1. Accurate detection device: closed-loop control of composition speed and position;
2. There are a variety of feedback comparison principles and methods: according to the different principles of the detection device to achieve information feedback, the feedback comparison methods of the servo system are also different. There are three commonly used pulse comparison, phase comparison and amplitude comparison;
3. High-performance servo motor (servo motor for short): For CNC machine tools used for complex profile processing, the servo system will often be in the process of frequent starting and braking. The ratio of the output torque of the motor to the moment of inertia is required to be large to generate a sufficiently large acceleration or braking torque. It is required that the servo motor has a large enough output torque at low speed and runs smoothly, so as to minimize the intermediate links in the connection with the mechanical moving part;
4. Speed ​​adjustment system with wide speed adjustment range, namely speed servo system: From the control structure of the system, the position closed-loop system of CNC machine tools can be regarded as a double closed-loop automatic control system with the position adjustment as the outer loop and the speed adjustment as the inner loop , its internal actual working process is to convert the position control input into the corresponding speed given signal, and then drive the servo motor through the speed control system to realize the actual displacement. The main motion of the CNC machine tool requires high speed regulation performance, so the servo system is required to be a high-performance wide speed regulation system.