Design of Controller for Linear Motor Servo System

摘要

Relative to rotary motor, linear motor is used in various accurate measurement and processing equipment and high-grade computer numerical control (CNC) machine tools widely because of its unique advantages such as no transmission structure and direct drive feed. With the increasing demands of speed response and positioning accuracy, conventional PID controller has gradually been unable to satisfy requirement of customers. In this work, two intelligent control methods, fuzzy controller and fuzzy-PID controller, were proposed to solve this problem. At the same time, disturbance observer was designed to compensate the disturbance, which eliminated the effect of external power perturbation and improved the speed regulation influence of linear motor, and the correctness of the method was verified by Matlab simulation. The simulation results indicated that the fuzzy-PID controller had better dynamic performance and compensating static error than the fuzzy control; The design of disturbance observer improved the static performance of linear motor speed control, but it had certain influence on dynamic performance. Therefore, the design should be selected according to the demand in practical engineering application.