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为使磁悬浮飞轮具有高精度、大力矩、多自由度动量交换能力,提出并设计了一种永磁偏置轴向磁轴承(AG-MB),主动控制飞轮转子沿轴向平动和绕径向偏转这3个自由度的运动。提出偏置磁通耦合度、控制磁通耦合度的概念,并给出了定义。通过磁路分析得到了AGMB和应用于微动框架的传统永磁偏置径向磁轴承(即径向力偏转磁轴承,RGMB)的耦合度的解析表达式,建立了磁路模型与磁路耦合程度之间的数值公式联系,进而定量分析了磁路耦合度对决定飞轮微动框架性能的偏置力变化率、电流刚度变化率以及最大承载力等磁轴承性能指标的影响,为解析分析和评价磁轴承的磁路耦合特性及其对磁轴承性能的影响提供了一条理论途径。经解析计算和有限元(FE)仿真验证表明,AG-MB具有更好的磁路弱耦合特性和偏转性能:微动框架时磁路耦合度的变化范围较RGMB小近一个数量级,从而偏置力变化率、电流刚度变化率的变化范围小近一个数量级,飞轮最大偏转力矩指标是RGMB的2.7倍以上。基于AGMB所设计的50N.m.s磁悬浮飞轮,可实现最大偏转角0.5°、最大偏转力矩8.1N.m、偏置力与电流刚度的变化率全工况下不超过15%的大容量、高精度的微动框架功能。
In order to make the magnetic levitation flywheel with high accuracy, large moment and multi-degree of freedom momentum exchange capacity, a permanent magnet bias axial magnetic bearing (AG-MB) is proposed and designed to control the flywheel rotor axial translation and winding To deflect these three degrees of freedom of movement. The concept of the coupling degree of the bias flux and the degree of flux coupling is put forward and the definition is given. The analytical expressions of the coupling degree between AGMB and the traditional permanent magnet bias radial magnetic bearing (ie, radial force deflection magnetic bearing, RGMB) applied to the micro-motion frame are obtained through the magnetic circuit analysis. The relationship between the magnetic circuit model and the magnetic circuit Coupling degree between the numerical formula, and then quantitatively analyzed the coupling degree of magnetic circuit to determine the flywheel fretting frame performance bias force, current stiffness rate of change and the maximum bearing capacity of magnetic bearings and other performance indicators for the analysis And to evaluate the magnetic coupling characteristics of magnetic bearings and their impact on the performance of magnetic bearings provide a theoretical way. The analytical calculation and finite element (FE) simulation results show that the AG-MB has better magnetic coupling and deflection performance: the coupling range of magnetic coupling is almost an order of magnitude smaller than that of RGMB, The rate of change of force and the rate of change of current stiffness are nearly one order of magnitude smaller, and the maximum deflection torque of flywheel is more than 2.7 times that of RGMB. Based on the 50N.ms maglev flywheel designed by AGMB, the maximum deflection angle of 0.5 ° and the maximum deflection torque of 8.1 Nm can be realized. The rate of change of the biasing force and the current stiffness is not more than 15% Moving frame function.