This paper proposes an electromagnetic actuation to obtain 3-DOF torques without magnetic forces for a separated payload in a fractionated spacecraft architecture (FSA). A fractionated payload module (FPM) and a supporting spacecraft module (SSM) are separated as two free-flying modules in FSA. Without the restriction of thrusters or reaction wheels onboard, the lifespan of FPM can be prolonged. The electromagnetic actuation configuration mounted on two modules is designed as FPM's exclusive actuation. It is composed of at least two magnetic bars in the FPM and six sets of coils in the SSM. By tuning the coils' currents in the SSM, the 3-DOF magnetic torques in the FPM are generated to regulate FPM's attitude without forces. This actuation amends the limitation that a magnetic dipole could only generate 2-DOF torque while inducing the unintended magnetic force as well. Simulations validate the feasibility of the proposed electromagnetic actuation configuration for the attitude control of FPM in FSA.

本文提出了一种电磁致动，以在分离航天器结构（FSA）中获得无磁力的3-DOF转矩而没有磁力。分离式有效载荷模块（FPM）和辅助航天器模块（SSM）在FSA中被分隔为两个自由飞行模块。不受船上推进器或反作用轮的限制，可以延长FPM的使用寿命。安装在两个模块上的电磁驱动配置被设计为FPM的独家驱动。它由FPM中的至少两个磁条和SSM中的六组线圈组成。通过调整SSM中的线圈电流，可在FPM中产生3-DOF磁转矩，从而无需力即可调节FPM的姿态。该致动修正了这样的限制，即磁偶极子在产生非预期磁力的同时也只能产生2-DOF转矩。仿真验证了提出的电磁致动配置用于FSA中FPM姿态控制的可行性。