Research On Position Synchronization Control Of Multi-linear Switched Reluctance Motor

With the rapid development of modern manufacturing,multi-motor synchronous control technology is becoming more and more important in control systems that apply to drive large mechanical equipment or high precision machine tool processing systems.The direct drive motor drive system is widely used in the synchronous control system because of its simple control structure,high mechanical efficiency and fast response.therefore,to improve the performance of multi-motor synchronous control system composed of linear control system is of great value.The linear motor is a direct drive system.At present,domestic and foreign research of the linear motor mainly concentrated on the permanent magnet linear motor,induction linear motor and linear switched reluctance motor(LSRM).Compared with permanent magnet linear motor and induction linear motor,LSRM has the advantages of simple structure,high reliability,high temperature and low cost due to the motion part does not include permanent magnet and coil.So multi-linear switched reluctance synchronous control system have a very considerable application prospects in transportation,defense industry,mechanical processing and many other fields.In the research of multi-motor position synchronization control,position tracking error and position synchronization error are the main improvement performance indexes.The position tracking error of the motor is related to the position tracking performance of the controller,and the position synchronization error between the motors is not only related to the performance of the controller,but also about structural design of the whole control system.In order to improve the position synchronization performance of multi-motor synchronous control system,the precise synchronization control strategy for multi-linear switched reluctance is designed in this paper.(1)Design master synchronization control structure.In view that the control system is sensitive to the unknown inner and external disturbance,combine with the mathematical model of LSRM,a disturbance observer based on exponential trending law is designed to compensation their adverse influence on the system.Then the PD controller which based on feedforward control and disturbance observer is designed to realize the single motor accurate position tracking to enhance the multi-motor position synchronization control accuracy under the master structure.(2)Design of adjacent cross-coupling synchronous control structure.The main idea is to construct new error state variables by combining the position errors of each motor with position synchronization errors amongst motors,obtain system model parameters by using system identification method,design of synchronization control algorithm based on adjacent cross-coupling to improve the synchronous control performance of multi-linear switched reluctance machine position synchronization systemSimulation results and experiments are performed on a motion control system consisting of three linear switched reluctance motors to demonstrate the effectiveness of the proposed synchronization control approach.