摘要
In this study, a novel design of reaction wheel used as attitude indicator/controller for satellites is proposed and examined through numerical finite element (FE) studies. Utilizing characteristics of magnetorheological fluids (MRF) being able to change state from liquid to solid when subjected to magnetization, a MRF-encapsulated magnetic ball is employed in this design to generate angular momentum in the reaction wheel. Through parametric studies in FE, best placement of coils is obtained in which the coils are concentrically placed and arranged sequentially around the circular tube of the reaction wheel. With the design, inertia of the reaction wheel is reduced and contact and friction issue of its moving parts are resolved. The proposed system can be ideal for indicating and controlling satellite's attitude in space.