A Magnetically Suspended Large Momentum Wheel
A Magnetically Suspended Large Momentum Wheel
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磁悬浮大型动量轮
DOI：
10.2514/3.56994
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发表时间：
1975
影响因子：
1.6
通讯作者：
F. Schmitt
中科院分区：
文献类型：
--
作者：
A. Sabnis;J. B. Dendy;F. Schmitt
设计并制造了一个800英尺磅/秒的工程原型动量轮组件，其中一个64磅的转子悬挂在径向被动、轴向主动的磁性轴承上，以10,000 rpm的速度旋转。讨论了磁轴承结构选择的基本原理、主动轴的控制概念以及结构相互作用的补偿。给出了轴承刚度和阻尼、阻力扭矩和车轮性能的测量结果。试验证实，在满足航天器功能要求的同时，可以实现低阻力、无润滑、无磨损的运行。确定电子元件的故障可以安全地通过触地球轴承进行协商，并激活冗余电子通道以恢复悬挂。通过暴露于正弦振动和发射级随机振动，确认了该单元的结构完整性。在重量和功耗方面，磁悬浮动量轮优于传统车轮，如果存在“无单点故障”的要求，则可以实现相当大的重量减轻。结论是，磁性轴承能够在动量轮和其他航天器应用中提供可靠、长寿命的运行。
An 800-ft-lb-sec engineering prototype momentum wheel assembly was designed and fabricated, in which a 64-lb rotor was suspended on radial-passive, axial-active magnetic bearings and rotated at 10,000 rpm. The rationale for the selection of the magnetic bearing configuration, control concepts for the active axis, and the compensation for structural interactions are discussed. Measurements of bearing stiffness and damping, drag torque, and wheel performance are presented. Testing has confirmed that low-drag, unlubricated, wear-free operation can be attained while satisfying functional spacecraft requirements. It was determined that failure of an electronic component could be safely negotiated on the touchdown ball bearings, with a redundant electronics channel being activated to restore suspension. The structural integrity of the unit was confirmed through exposure to sinusoidal vibration and launch-level random vibration. In terms of weight and power dissipation, magnetically suspended momentum wheels compare favorably with conventional wheels, and considerable weight saving may be realized if a "no single point failure' requirement exists. It is concluded that magnetic bearings are capable of providing reliable, long-life operation in momentum wheels and other spacecraft applications.