外转子储能飞轮结构优化设计研究

Optimization Design of the Energy Storage Flywheel with External Rotor

储能飞轮属于功率型储能技术,利用现代电力电子技术,实现电能与飞轮动能之间的转化。飞轮储能系统利用上、下主动电磁轴承将飞轮旋转体处于无接触悬浮。选择一种阶梯变截面近似等应力转子金属材料飞轮,以获得更高的储能密度,在高形状系数与加工制造难度之间合理优化。针对此飞轮进行强度以及转子动力学分析,此一体化外转子飞轮方案可有效解决飞轮转子轴向长度影响转子动力力学特性并将导致飞轮储能系统结构紧凑性欠佳的问题。

Energy storage flywheel(ESF)is a kind of power storage technology,which combined with modern power electronics technology achieve the conversion between electric energy and flywheel kinetic energy.The flywheel is leviated by the upper and lower active magnetic bearings(AMBs).A metal flywheel with stepped variable section,which is approximate to equal stress rotor is proposed.Optimization between shape factor and manufacture diffculty is considered to aquire high energy density.The strength and the rotor dynamics of the flywheel are analyzed.The design with external rotor can effectively solve the problem of the poor rotor dynamics and the compactness which are induced by the axial length of the flywheel.