A 3(5) Degree of Freedom Electrodynamic-Bearing Wheel for 3-Axis Spacecraft Attitude Control Applications
A 3(5) Degree of Freedom Electrodynamic-Bearing Wheel for 3-Axis Spacecraft Attitude Control Applications
复制标题
DOI：
10.1007/978-3-642-51724-2_2
复制
发表时间：
1989
期刊：
影响因子：
--
通讯作者：
U. Bichler;T. Eckardt
中科院分区：
文献类型：
--
作者：
U. Bichler;T. Eckardt
本文讨论了两种相关类型的电动悬浮转子，作为航天器姿态控制的动量轮或反作用轮。一个是三轴主动型，另一个涉及五个主动控制的自由度。车轮采用扁平设计，控制力作用在主转子质量集中的外缘上，从而避免了低结构共振。轮缘通过钛弹簧与轮毂分离。这两个轮子都提供了一个微调万向节的能力，使航天器的三轴姿态控制与一个旋转质量只有。一个特殊的解耦倾斜控制回路设计消除了所有陀螺仪的影响，如岁差和章动osci！电动轴承原理是有利的，因为质量的主要部分可以集中在转子的外边缘上，从而有助于期望的惯性。力的产生是线性的，仅涉及非常小的滞后，并且实际上在正交轴之间不存在交叉耦合，这有助于控制策略，以防止干扰不平衡力影响轴承的定子，以用于所谓的“微重力”环境。车轮实际上是在发展阶段，并在该文件的原则，设计，控制回路和第一结果。
This paper deals with two related types of electrodynamically suspended rotors, acting either as momentum or reaction wheels for spacecraft attitude control purposes. One is of the three-axis active type, the other involves five actively controlled degrees of freedom. The wheels are of a pancake design with the control forces acting on the outer rim where the main rotor mass is concentrated thus avoiding low structural resonances. The rim is decoupled from the hub by titanium springs. Both wheels provide a vernier gimballing capability enabling three-axis attitude control of spacecraft with one rotating mass only. A special decoupling tilt control loop design eliminates all gyroscopic effects, such as precessional and nutational osci! lations.The electrodynamic bearing principle is advantageous because main parts of the mass can be concentrated on the outer rim of the rotor contributing to the desired inertia. Force generation is linear involving only very small lags and practically no cross-coupling exist between the orthogonal axes facilitating a control strategy to prevent disturbing unbalanced forces from affecting the stator of the bearing for the use in so-called'micro-gravity'environment. The wheels are actually in the development phase and in the paper the principles, the design, the control loops and first results are presented.