Servo system is the last link of CNC machine tools, and its performance will directly affect the accuracy, speed and other technical indicators of CNC machine tools. Therefore, the servo drive device of CNC machine tools is required to have good fast response performance, accurately and sensitively track the digital instruction signals sent by CNC machine tools, and faithfully execute the instructions sent by CNC machine tools, so as to improve the dynamic tracking characteristics and static tracking accuracy of the system.

2. Measurement feedback system

The measuring element detects the actual displacement values of each coordinate axis of the NC machine tool and inputs them into the NC device of the machine tool through the feedback system. The NC device compares the feedback actual displacement value with the command value, and outputs the displacement command needed to reach the set value to the servo system.

Extended data

Servo system is an important part of CNC machine tools, which is used to realize feed servo control and spindle servo control of CNC machine tools. The function of the servo system is to convert the command information received from the numerical control device into linear displacement or angular displacement of the execution part of the machine tool after power amplification and shaping.

The servo system consists of two parts: the driving device and the executing mechanism. The driving device consists of a spindle driving unit, a feed driving unit, a spindle servo motor and a feed servo motor. Stepper motor, DC servo motor and AC servo motor are commonly used driving devices.

Numerical control device is the core of numerical control machine tool. Modern numerical control devices all adopt the form of CNC (computer numerical control), and generally use multiple microprocessors to realize numerical control functions in the form of programming software, so it is also called software NC.

Numerical control system is a position control system, which interpolates the ideal motion trajectory according to the input data, and then outputs it to the executive parts to process the required parts. Therefore, the numerical control device is mainly composed of three basic parts: input, processing and output. All these tasks are reasonably organized by computer system programs, so that the whole system can work harmoniously.

Refer to Baidu Encyclopedia-CNC Machine Tool