Closed loop servo system
is also subordinate to CNC machine tool servo systems; closed loop servo system
is composed of Comparison links, servo motor driver
amplifier, feed servo motor,
mechanical transmission and integral linear displacement measuring device. The
system has detection and feedback correction function on the amount of movement
of the of the machine movement components, it adopts DC servo motor or AC
servo motor as the drive components. It can directly use the grating
installed in the table or induction motor as the position detection device to
constitute high-precision closed loop position control system. . Linear
displacement detector of the system was installed in the moving parts; its
accuracy relies on the accuracy of displacement detection devices and
sensitivity, the process precision it produced is relatively high. But many
nonlinear factors have a significant impact on system stability such as the
mechanical transmission device stiffness; friction damping characteristics,
Backlash etc. these factors make closed loop more complex to install for servo
system. Therefore, this system only used in high precision and large-scale CNC
machine tools.。