一种超薄反作用飞轮的大面积磁悬浮结构分析

为提高轴向磁通反作用飞轮的轴向刚度和寿命，结合轴向磁通飞轮的结构，提出一种超薄、大面积磁悬浮的反作用飞轮。重点分析该飞轮的大面积磁悬浮结构，从磁环的宽度、磁环的充磁方向、磁环间距、铁芯厚度和磁悬浮刚度五个方面展开研究。通过有限元仿真可以发现：随磁环宽度的增加，定子对转子的斥力是先增大后减小；定子内外环磁化方向相反时比相同时能得到更大的斥力；在内外环磁化方向相反时，内外环磁钢间距越小，定子对转子斥力越大；磁悬浮部分铁芯厚度的减小对定转子间的斥力的影响极其有限，但对降低飞轮重量具有重要意义；磁悬浮的刚度与转子偏离中心的距离近似成正比。

Analysis of Large Area Magnetic Suspension in Ultrathin Reaction Flywheel

To improve the axial stiffness and the life span of the flywheel with axial flux, an ultra-thin and large area magnetic suspension reaction flywheel is proposed in view of the structure of axial flux motor. In this paper, the large area magnetic suspension structure of the flywheel is analyzed with special emphasis on five aspects, which are the width of magnetic ring, magnetizing direction of magnetic ring, the interval of magnetic rings, iron core thickness and stiffness of magnetic suspension. Finite element simulation results show that the repulsive force firstly increases, then decreases with the increase of the width of magnetic ring; the structure with opposite magnetization direction of stator inner and outer ring is the optimum; the smaller the interval between the inner and outer magnet steel is, the larger the repulsive force that the stator exerts on the rotor; the thickness of the stator and the rotor iron core can hardly change the repulsive force between the stator and the rotor, but it is significant for the weight of the flywheel; the stiffness of magnetic suspension is almost proportional to the distance that the rotor deviates from the center.