Research On System Of Linear Elevator Electromagnetic Suspension Control System Based On Ring Coupling

Nowadays,both in production and life,magnetic levitation technology is applied in more and more fields,and it have been successfully applied in the domestic trains,bearings and machine tools.But it is only a primary stage that applying the technology to linear elevator currently in our country.When the linear elevator is running,the surrounding environment of the maglev guiding system is complex and changeable.The load of the liner elevator will change over time will be subject to sealed external disturbances.The research target is the maglev guiding system of linear elevator,and the focus of this study is the synchronous control for the four single magnetic levitation device of the linear elevator.Firstly,the "Eight-Maglev" control structure in this study is established in the characteristics of the linear elevator maglev guiding system,and four single magnetic levitation devices in the horizontal direction are selected as the research object,and establishing the mathematical model of single magnetic levitation device in the x axis direction,studying deeply the characteristics.At the same time,considering the nonlinearity of the model,we need to linearize the model.In this paper,the state accurate feedback linearization method is used to guarantee the exact nonlinearity of the model.Secondly,an adaptive fuzzy sliding mode-PID(VUFSC-PID)control strategy is proposed to solve the problem of fast tracking and robustness of magnetic levitation elevator guidance system.A control method combining adaptive fuzzy sliding mode control and PID control is adopted.This control method adjusts the parameters through the variable universe fuzzy controller to realize the adaptive real-time adjustment of the parameters.The control method is used to simulate the single magnetic suspension device under Matlab.Compared with the traditional sliding mode control and PID control,the control method can effectively improve the instability caused by the system structure.Finally,for the analysis of a variety of element that can influence the synchronization error of the multi-magnetic suspension device,and by comparing the control structure of synchronous control such as master-slave control,master control,cross-coupling control,deviation coupling control and ring coupling control advantages and disadvantages,the final use of ring coupling control structure.Due to the mechanical coupling between the singlemagnetic levitation devices,this paper adopts the ring coupling control structure of the position compensator of the fuzzy logic algorithm to improve the synchronous motion precision of the single magnetic levitation device.The simulation results show that compared with other control structures,the ring coupling control structure can improve the stability and synchronization of the system to a certain extent.