Research On Servo Control Strategies Of Flux-Switching Permanent Magnet Linear Motor Feeding System

The existing permanent magnet synchronous linear motors are difficult to be widely used in various types of equipment feed systems due to high manufacturing cost,especially long-stroke feed.In recent years,a new type of stator permanent magnet linear motor,Flux Switching Permanent Magnet Linear Motor(FSPMLM)has attracted much attention.The most important feature of the FSPMLM is that the armature windings and permanent magnets are set on the primary of the motor,and the motor secondary is a simple salient-pole iron core junction structure.In the long stroke feed,the use of the secondary as the stator can greatly reduce the amount of permanent magnets,reduce the cost of the motor,and facilitate installation and maintenance.At the same time,FSPMLM inherits the advantages of high power density,high efficiency,and good torque performance of permanent magnet motors,which gives them excellent development potential.In order to meet the requirements of high-speed,high-efficiency and precise controllable feed drive,it is necessary to construct a suitable servo control system for FSPMLM.Based on the analysis of FSPMLM structure principle and mathematical model,this dissertation studies Space Vector Pulse Width Modulation(SVPWM)technology and fuzzy sliding mode control strategy.Based on TMS320F28335 as the main control chip,the hardware platform of the servo system and programming algorithm is constructed,and complete prototype analysis.Firstly,this dissertation introduces the general research status of permanent magnet linear motor control strategy and sliding mode variable structure in domestic and foreign literatures,analyzes and explains the basic structure and working principle of FSPMLM,and establishes FSPMLM flux linkage equations,voltage equations,electromagnetic thrust equations and mathematical models of mechanical motion equations based on the principle of synchronous motor vector transformation.The SVPWM voltage waveform modulation was studied.At the same time,the current loop,speed loop and position loop of the FSPMLM vector control system were designed respectively.The establishment of the three closed-loop PI control system was verified.The validity of the above algorithm was verified by simulation analysis.Secondly,a detailed theoretical discussion was carried out on Sliding Mode Controller (SMC)and Fuzzy Sliding Mode Controller(FSMC).Based on the MATLAB/SIMULINK environment,the FSPMLM control system simulation model with SMC and FSMC algorithms was built.The results show that FSMC responds more quickly than SMC and PI,and has higher tracking accuracy.It also maintains good robustness to parameter changes and external disturbances.Finally,based on theoretical research and system simulation,this dissertation presents the hardware platform structure and software design flow of FSPMLM control system based on TMS320F28335 microprocessor.The experiments of SVPWM,PI and FSMC control algorithms were performed on the FSPMLM prototype to verify the feasibility of the servo control strategy proposed in this paper,which laid the foundation for further in-depth research.