Research on Nonlinear Compensation of Magnetic Levitation System Based on Discrete Inverse Preisach Model
In the control of the magnetic levitation platform,the hysteresis characteristics of the electromagnet core material will greatly affect the control accuracy,and the hysteresis characteristics of compensating are an indispensable part of the magnetic levitation precision control system.In order to realize the compensation of hysteresis nonlinearity in the magnetic levitation precision control system,a discrete inverse Preisach model was used to construct a compensator.Firstly,the discrete inverse Preisach model was established,and then the compensator was constructed according to the hysteresis compensation principle.According to the curve shape of the inverse model,a distribution function based on hyperbolic tangent was established to verify the rationality of the discrete inverse Preisach model.Finally,the non-negative least squares identification model was used to identify the model.The results show that the maximum error of inverse Preisasch model in describing the electromagnet inverse hysteresis loop is 0.3%.The constructed compensator constructed has good compensation effect and provides a feasible scheme for hysteresis compensation of magnetic levitation system.
magnetic levitationpreisach modelhysteresis characteristicsdistribution functioncompensator
万方数据
维普
