中文摘要：

针对磁悬浮飞轮用基于机构自锁原理的可重复电磁锁紧装置,分析其原有显式电磁铁执行机构的电磁力学特性,得知其最小解锁残余力过大,若采用隐式电磁铁,可以消除解锁残余力,从而提高锁紧装置解锁可靠性。采用等效磁路法对隐式电磁铁进行磁路分析,并给出该电磁铁在执行锁紧、保持锁紧、执行解锁和保持解锁四种状态下的力学模型。利用电磁场数值分析法,对隐式电磁铁进行实例设计,并通过卫星发射过程中的正弦扫频振动和随机振动试验,检验改进后的锁紧装置对飞轮系统的保护效果。结果表明,锁紧装置的最小解锁残余力为0.25 N,远小于原有显式电磁铁方案（29.5 N）,且振动测试中,飞轮定、转子的最大相对振动位移为70μm,最大位移振幅为10μm,都小于磁悬浮飞轮系统的保护间隙100μm。改进后的隐式电磁铁在提高解锁可靠性的同时,可有效地实现对飞轮系统的锁紧保护功能。

英文摘要：

According to the repeated electromagnetic locking device based on the self-locking principle for magnetic bearing flywheel,the electromagnetic and mechanics characteristics of primary explicit electromagnet are analyzed.It is concluded that the minimum unlocking residual force is much too large,while the adoption of the implicit electromagnet can get rid of it and increase the unlocking reliability.The equivalent magnetic circuit method is applied to magnetic analysis of implicit electromagnet,and its mechanics model under four statuses including carrying out locking/unlocking and keeping locking/unlocking is got.The electromagnetic numerical analysis method is used for a solid example design for the implicit electromagnet.Additionally,to verify the protective effect of the improved locking device for the flywheel system during satellite launch,the swept-sine vibration and random vibration are carried out.The results show that the minimum unlocking residual force of locking device is 0.25 N,far smaller than that of explicit electromagnet about 29.5 N.Moreover,the maximum vibration displacement between the flywheel stator and rotor is 70 μm and its maximum amplitude is 10 μm.Both of them are less than the flywheel system protective gap of 100 μm.This indicates that the improved implicit electromagnet can effectively carry out the locking protection function to the flywheel system while raising the unlocking reliability.