Fuzzy Adaptive Fractional Order PI~λD~μ Control For Maglev Guiding System In Linear Elevator

Maglev guiding system of the linear elevator run in harsh environments, it have tosustain rapid load changes and unknown disturbances."Eight-Maglev" topology isintroduced for the magnetic levitation rail in this paper, the main research is air-gap controlof the linear elevator x axis subsystem, It is to solve one of the key technical problemwhich faster stability and stronger robustness of the linear elevator.At first, mathematic model of single magnetic levitation guiding system is established,the nonlinear model is linearized by using feedback linearization method, the linear voltagecontrol model and current control model are obtained respectively. To make the modelcloser to the actual system, the voltage control model is used to controller design.Secondly, for the fast stability and robustness problem of single maglev guidingsystem in linear elevator, fractional calculus theory is introduced, the order of traditionalPID control was extended to the field of fractional, then fractional order PIλDμControl waspresented; Due to the extra tuning knobs compare with traditional PID controller,fractional order PIλDμcontroller was expected that better control performance can beachieved; in addition its differential also has function of memory, so the historyinformation influence on present and future control, thus to improve the control quality ofthe system. To solve the problems that steady-state accuracy of the system and select theappropriate control parameters in fractional order PIλDμController, combining fuzzycontrol with fractional order PIλDμcontrol, a fuzzy adaptive fractional order PIλDμcontroller is designed, using fuzzy logic to adjustment the control parameters of fractionalorder PIλDμController online, achieve higher steady-state accuracy and stronger antidisturbance ability of the system.Finally, controllers are used to the linear elevator x axis maglev guiding subsystemrespectively. The Matlab simulation software is used to analyze the control strategy aboveon, the simulation results make it is obvious that fuzzy adaptive fractional order PIλDμ Control can meet requirements of the faster stability, better steady-state accuracy andstronger robustness of single maglev guiding system in linear elevator.