Abstract
In this paper, Variable Speed Control Moment Gyro (VS-CMG) for on-orbit servicing satellite attitude control is studied. The on-orbit-servicing satellites need various attitude control tasks. For example, highly accurate control devices are recommended for inspection and observation missions, and for the work of assembly, repair, or orbital maneuvers, high torque control devices are recommended. Among the attitude control devices, Reaction Wheel (RW) and CMG are often used. RW can highly accurate control but cannot create large torque. CMG can create large torque, but its accuracy is coarse. If rotational speed of CMG rotor can be controlled, CMG can be used as RW. Therefore, VS-CMG, which can control the rotational speed of its rotor, can switch the control mode; RW mode and CMG mode. So, VS-CMG can control attitude of on-orbit servicing satellite very efficiently. We made an experimental model of VS-CMG and conducted 2-dimensional ground experiment in which a satellite simulator equipped with VS-CMG is floating by air pressure and can move using air thruster. This paper describes the process of making the experimental model of VS-CMG and shows the results of 2-dimensional ground experiment.
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