This paper proposes a novel electromagnetic separation system for the small spherical satellite Q-SAT, which is developed by Tsinghua University. Q-SAT was successfully launched on August 6, 2020 and works well now. Q-SAT requires the separation system no pollution, no impact, multi-point synchronous release and repeatable test. In order to meet these requirements, an electromagnetic separation method is proposed and the system is designed. The system consists of bearing structure, a pair of locking and release mechanism, four ejection mechanism and a drive power. The scheme of separation system can be summarized as “two locks, four ejections”. The key to system is the lock and release mechanism using ball-lock principle driven by electromagnets. The analytical relationship of the mechanism driving force is given. How to balance the contradiction between lock and release, which is a problem bring by the system, is discussed. The prototype is made. The verification tests are fully carried out including function, vibration, shock, coldness and velocity measurement. The test results show that the system satisfies the launching requirement. The reliability of the system was proven by the successful separation. Systems based on the same electromagnetic separation method could be widely used on other satellites or payloads in the future.

本文提出了一种由清华大学开发的新型的小型球形卫星Q-SAT电磁分离系统。Q-SAT于2020年8月6日成功发射，目前运行良好。Q-SAT要求分离系统无污染，无冲击，多点同步释放和可重复测试。为了满足这些要求，提出了一种电磁分离方法并设计了系统。该系统由轴承结构，一对锁定和释放机构，四个弹出机构和一个驱动力组成。分离系统的方案可以概括为“两个锁，四个弹出”。系统的关键是采用电磁驱动的球形锁定原理的锁定和释放机构。给出了机构驱动力的解析关系。讨论了如何平衡锁与释放之间的矛盾，这是系统带来的问题。原型制作完成。验证测试已完全执行，包括功能，振动，冲击，寒冷和速度测量。测试结果表明，该系统满足发射要求。成功的分离证明了系统的可靠性。基于相同电磁分离方法的系统将来可能会在其他卫星或有效载荷上广泛使用。成功的分离证明了系统的可靠性。基于相同电磁分离方法的系统将来可能会在其他卫星或有效载荷上广泛使用。成功的分离证明了系统的可靠性。基于相同电磁分离方法的系统将来可能会在其他卫星或有效载荷上广泛使用。