Research And Design Of The Array-Based Hybrid Magnetic Levitation System

With the rapid development of the current economy and technology,our country has generated a large demand for spacecraft with new functions and new technologies.However,how to effectively simulate the actual working environment of spacecraft on the ground has become an important factor restricting the research and development of spacecraft.Relying on related projects,the research team proposed a liquid-floating gravity environment test simulation method combining electromagnetic force,which introduces magnetic levitation technology into the traditional liquid float method,and achieves continuously adjustable electromagnetic force balance based on the non-contact property of electromagnetic force^[1].The array-based hybrid magnetic levitation system studied in this paper belongs to the national 863 high-tech supported project and has high practical value in the field of microgravity research,for example,aviation and aerospace.Main results are as follows:?1?An array-based hybrid magnetic levitation system was studied.The simplified electromagnetic force model of the array-based hybrid magnetic levitation system is established,and the electromagnetic force calculation method of the system is derived.This method can not only estimate the electromagnetic force of permanent magnets easily and quickly,but also can be used as a parameter estimation tool for system design.The feasibility of the array-based hybrid magnetic levitation system is demonstrated by both simulation results and calculative analysis,and the goal of providing stable and uniform magnetic field and electromagnetic force in a large working range is achieved.?2?An off-line calibration and online control method to output electromagnetic force is proposed.A current inverse solution model based on improved FCM clustering algorithm and BP neural network is proposed.First,this method can greatly reduce the engineering quantity of the calibration work under the premise of ensuring the accuracy.Using this method,the discrete calibration data is processed into a continuous model,which can be applied to the current output calculation of the system.In addition,since the output current solution is affected by multiple variables such as the position of the suspension and the value of the preset electromagnetic force,the system has complex nonlinear characteristics such as large hysteresis and large inertia,which makes it difficult to adjust the electromagnetic force.The proposed method solves this problem effectively.?3?The structure of different units,the spatial layout,the electromagnetic coil array switching strategy,the power structure,the hardware configuration and software implementation of the controller of the array-based hybrid magnetic levitation system are analyzed.The design of the array hybrid magnetic suspension system is completed.Finally,the contents of each chapter are summarized,and the future research direction is pointed out.To sum up,the electromagnetic force simplified model and the electromagnetic force calculation method proposed in this paper can estimate related system parameters quickly and easily.Moreover,the proposed offline-calibration and online-control electromagnetic force output method and its optimization can effectively reduce the control difficulty and workload,thereby improving the control performance.Finally,based on the computational and simulation design of the array-based hybrid magnetic levitation system,the electromagnetic coil array can also generate a stable and uniform magnetic field in the working area,providing suitable electromagnetic force for the suspension,and realize the requirement of microgravity environment simulation.