Research On Contour Error Compensation Method Of Multi-Linear Motor System Based On Active Unified Model

At present,the existing drive mode has gradually been unable to keep up with the increasing trend of speed and precision in industrial production,and has been gradually replaced by linear direct drive system represented by linear motor.Multi-motor synchronous control system composed of linear motors accelerates production,but the sensitivity of linear motors to interference and the structural relationship between the motors in the system will have an impact on the control effect.The research of multi-linear motor synchronous control system has great application value.In this paper,the contour error of multi-motor synchronous control system is taken as the control target,which is divided into three parts: the research of linear motor servo system,the design of multi-motor control structure model and the design of compensation controller.Firstly,the mathematical model of permanent magnet synchronous linear motor and the simulation model of its servo system are completed,and the control performance is improved by using two-degree-of-freedom PID and genetic algorithm.The simulation results show that it can improve the anti-disturbance ability of the system while maintaining the following performance,which lays the foundation for the follow-up study of multi-machine synchronization system..Secondly,the definition of contour error of multi-machine system is elaborated.The mathematical relationship between contour error and axes is shown by common error models in two-dimensional plane.The space vector method is used to model contour error.Then it points out the shortcomings of the existing multi-machine synchronization structure,improves the active unified coupling model on the basis of the existing structure,and makes a theoretical comparison and analysis with the existing common structure.Finally,the simulation and experimental results show that the method can not only effectively reduce the outline error of the system,but also be applied to the instruction transmission.The disturbance can also be well suppressed and the synchronization control performance of the system is improved.In addition,in order to further improve the anti-transmission interference ability,based on the PID control,combined with the neural network with adaptive function as the coupling controller,and the operation of the BP neural network in the existing methods to improve the attempt.Finally,simulation and experiment show that the improved method can effectively optimize the control accuracy of the system..