论文部分内容阅读
为了提高空间用磁悬浮飞轮输出偏转力矩的能力和精度,提出一种利用轴向力控制转子径向偏转的五自由度永磁偏置磁轴承(permanent-magnet-biased magnetic bearing withfive degrees of freedom,5-DOF-PMB),有效减小了飞轮体积和转子轴向长度,提高了系统的集成度,改善了转子系统的固有模态和稳定性。有限元仿真表明,按照角动量为15 N?m?s飞轮的要求设计的轴向力偏转5-DOF-PMB可同时满足各自由度负载的要求。为了提高转子径向大偏移时主动振动的控制精度,进一步对轴向力偏转5-DOF-PMB径向通道进行了磁路解耦设计。等效磁路分析与有限元仿真表明,经磁路解耦的5-DOF-PMB径向通道间磁路耦合程度削弱了2个数量级。最后从等效磁路和结构设计角度,对永磁偏置磁轴承的磁路解耦设计方法进行了归纳和总结。
In order to improve the capability and accuracy of space-borne flywheel output deflection torque, a 5-DOF permanent magnet bias magnetic bearing (5-DOF biased magnetic bearing with axial force control of rotor radial deflection) -DOF-PMB), effectively reducing the flywheel volume and axial length of the rotor, improving the system integration and improving the natural mode and stability of the rotor system. The finite element simulation shows that the 5-DOF-PMB axial force deflection designed according to the requirements of flywheel with angular momentum of 15 N? M? S can meet the requirements of each degree of freedom load simultaneously. In order to improve the control accuracy of the active vibration when the rotor radial large offset, the magnetic circuit decoupling design was further carried out for the radial force deflection of the 5-DOF-PMB radial shaft. Equivalent magnetic circuit analysis and finite element simulation show that the degree of magnetic coupling between the 5-DOF-PMB radial channels decoupled by magnetic circuit is weakened by two orders of magnitude. Finally, from the perspective of equivalent magnetic circuit and structural design, the magnetic circuit decoupling design method of permanent magnet bias magnetic bearing is summarized and summarized.