| As the energy problem is becoming more and more serious, people pay more attention to improve energy efficiency and reduce energy waste. Flywheel energy storage technology as a relatively new way of clean energy storage is becoming more of a concern by energy industry researchers. Through the optimization of the flywheel design, to improve the energy storage density of flywheel energy storage system has become the main problem of flywheel energy storage research. So, this paper take the 100kWh flywheel energy storage system research and design development as the background, based on improving the energy storage density optimize the design of flywheel material, structure, and the correctness of optimal design is verified by simulation analysis.According to the 10 kWh flywheel energy storage system design requirements,preliminary design the flywheel structure in order to improve the system energy storage density. First of all, according to the energy storage index requirements to select the flywheel material, determine to use metal wheel hub and composite flange to the preparation of composite flywheel. Secondly, according to 10 kWh rated speed requirements, found that single layer composite flange cannot meet the requirements of its strength. Finally, in order to improve the radial strength of composite flywheel, chose three layers composite ring, use the interference fit connection method to the preparation of composite flywheel.According to the material properties and structural form of the initial design, to improve the composite flywheel energy storage density as the target to analysis the stress of composite flange, optimization analysis of composite flange structure, use the quadratic sequence programming method in optimization algorithms. First of all, because of the interference fit effect produce initial stress of composite flange, need to analysis of composite flange initial stress. Second, based on the theory of plane strain, need to analysis the initial stress of composite flange. Design variable, objective function and constraint conditions in quadratic sequence programming method are analyzed, establishing mathematical model of systemoptimization problem, optimization calculating the thickness of each layer and magnitude of interference of composite flange. Finally, according to the results of optimization calculation,establishing composite flange model,using ANSYS software on the stress and strain analysis.In order to improve the composite flywheel energy storage density, after determining the structure size of composite flange, optimize the structure of aluminum alloy wheel hub. First of all, analysis the energy storage indicators of 10kWh flywheel system, get the relationship of wheel hub design height and radius, and the stress distribution expression of the hub.Secondly, using optimal control theory for structure optimization, building the flywheel optimization problem mathematic model to get mathematic analytic expression of the flywheel shape. Through calculation and analysis, get the optimized structural parameters of the aluminum alloy wheel hub, to determine the structure of composite flywheel. Finally,using ANSYS to strength analysis, to ensure the strength of the composite flywheel meets the requirements.In this paper, based on 10 kWh of electromagnetic bearing design of the flywheel energy storage system structure parameters and control parameters. Analysis data range of electromagnetic bearing equivalent stiffness and equivalent damping. Using the finite element method to calculate rotor critical speed, to get rotor critical speed distribution of initial design condition, and modal analysis. |
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