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.
The servo system includes two parts: the drive device and the actuator. The drive device consists of a spindle drive unit, a feed drive unit, a spindle servo motor and a feed servo motor. Stepper motors, DC servo motors and AC servo motors are commonly used drives.
The measuring element detects the actual displacement value of each coordinate axis of the CNC machine tool and inputs it into the CNC device of the machine tool through the feedback system. The CNC device compares the actual displacement value fed back with the command value, and outputs the set value to the servo system. The required displacement command.
