Servo system is an important part of CNC machine tools and 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 the linear displacement or angular displacement of the machine tool execution part after power amplification and shaping. Since the servo system is the last link of the CNC machine tool, its performance will directly affect the technical indicators such as the precision and speed of the CNC machine tool. Therefore, the servo drive device of the CNC machine tool is required to have good rapid response performance and accurately and sensitively track the CNC device. The digital command signal sent out, and can faithfully execute the command from the numerical control device, improve the system's dynamic following characteristics and static tracking accuracy.
Sistem servo mencakup dua bagian: perangkat penggerak dan aktuator. Perangkat penggerak terdiri dari unit penggerak spindel, unit penggerak umpan, motor servo spindel, dan motor servo umpan. Motor stepper, motor servo DC dan motor servo AC adalah penggerak yang umum digunakan.
Elemen pengukur mendeteksi nilai perpindahan aktual dari setiap sumbu koordinat alat mesin CNC dan memasukkannya ke dalam perangkat CNC alat mesin melalui sistem umpan balik. Perangkat CNC membandingkan nilai perpindahan aktual yang diumpankan kembali dengan nilai perintah, dan mengeluarkan nilai yang ditetapkan ke sistem servo. Perintah perpindahan yang diperlukan.
