Research Of Fuzzy IP Control For Permanent Magnet Linear Synchronous Motor Position System

To meet the Industrial 4.0,China puts forward the "2025 made in China" strategic plan to realize the transformation from a big manufacturing country to a powerful one.As a kind of combination between mechanical manufacturing and control technology,Numerical control machine tool technology is the core of high-end equipment manufacturing industry,the pillar of equipment manufacturing industry,the important guarantee to realize the strategy of manufacturing powerful country,which embodies the manufacturing industry upgrading and national comprehensive strength.High speed machining and high precision micro feed machining has been the mainstream of the development of Numerical control machine tools,and is one of the key equipment technology of advanced manufacturing.Permanent magnet linear synchronous motor(PMLSM)uses high-energy permanent magnet and has the characteristic of high thrust-intensity,low loss,small electrical time-constant,fast response,easiness to realize vector decoupling control etc,which becomes the preferred scheme for number control machine tool to realize micro-precision feed,high-speed and super-high-speed process.Fuzzy logic control is a kind of intelligent control algorithm based on human mind reasoning.It changes an expert knowledge based control strategy into automatic control strategy in essence,so it is a developing and promising control strategy in the field of automation,to which great attention has been paid.Fuzzy control technology uses language rule and fuzzy reasoning of the class of fuzzy sets to achieve better control performance,and has good control robustness compared with traditional control one.Permanent magnet linear synchronous motor position servo control system is studied in this thesis.Firstly,the development and application of the linear motor is introduced,the PMLSM’s structure,working principle and mathematical model based on vector control is studied.Secondly,the integration-proportion IP position controller with parallel feedback loops is designed.The IP position controller is compared with the proportion-integration PI position controller from system structure and transfer function,which indicates the IP position controller could meet tracking specifications and suppression disturbance simultaneously.The parameters of the IP controller are designed to ensure the system without overshoot,and the simulation results showed the effectiveness of the design.Thirdly,the working principle of fuzzy controller is summarized.Considering the controlled object change and external disturbance,and it is difficult to adjust the controller parameters online,a fuzzy controller for PMLSM is available,which was fulfilled through fuzzification of the deviation E and its change rate EC of position,establishment of fuzzy logic rules,and fuzzification of the output U based on the centroid method.The simulation results showed that fuzzy/IP controller was better than the IP controller and fuzzy controller in the steady-state accuracy and dynamic performance.Finally,the main disturbance factors of PMLSM position servo system are analyzed.Considering the controlled object with nonlinear friction,the fuzzy control rules with compensation friction are designed.The simulation results show that the designed fuzzy controller can compensate the nonlinear friction,can satisfy the performance index of the system and has strong robustness.