Design of DOB compensation gain PID damping controller for electromagnetic drive fast tool servo closed-loop system

In order to make up for the driving shortage of fast tool servo (FTS) system, an electromagnetic driven DDS system was developed to realize the tracking control method of high bandwidth trajectory. The feedforward compensation of parameters is realized by using static gain, and the disturbance observer (DOB) is established by linear control to compensate the feedforward gain processing. The experimental test and analysis were carried out to collect control instructions from the controller to realize the driving effect on FTS excitation coils and complete the output displacement control. The results show that the resonant peak can be suppressed obviously when using PAVPF controller. The damping control keeps the stability margin constant, and then the higher gain PID controller controls the system to achieve a significant increase in the closed-loop bandwidth of the system. PAVPF damping reaches ±2 μm error; After increasing the DOB gain, the maximum error reduction of the system is close to ±0.16 μm. The research has a good control precision, which plays a theoretical supporting role for high precision tool control.