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Auto-Eliminating Clearance Auxiliary Bearing Device for Active Magnetic Bearing Systems

机译：主动电磁轴承系统的自动消除间隙辅助轴承装置

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摘要

An auto-eliminating clearance auxiliary bearing device (ACABD) for active magnetic bearings (AMBs) has recently been designed and a prototype system was tested in this study. ACABD mainly consists of a series of connected tilting supports. In this design, a ball bearing is directly mounted on a rotor as the auxiliary bearing in an AMB system. The outer race of this ball bearing is surrounded by these supports. In the open position, there exists an initial protective clearance between the outer race of the ball bearing and the tilting supports. When the bearing-mounted rotor drops on these supports due to an AMB failure, the friction between the outer race of the ball bearing and the tilting support rotates these supports to eliminate the clearance and recenter the rotor. Due to elimination of the clearance, the possibility of backward whirl of the rotor is eliminated. The movement mechanism of this device is analyzed kinematically. The rotation of these supports, elimination of the protective clearance, as well as the rotor rotating stability after the clearance elimination are discussed from the perspective of statics. Furthermore, a preliminary prototype experimental rig was developed to demonstrate the feasibility of the ACABD after AMB system failure. Experimental results show that, after the AMB system failed, the ACABD immediately eliminated the clearance between the outer race of the ball bearing and the supports and pushed the rotor center close to the initial position.
机译：最近，针对主动磁轴承（AMB）设计了一种自动消除间隙辅助轴承装置（ACABD），并在本研究中测试了原型系统。 ACABD主要由一系列连接的倾斜支架组成。在这种设计中，滚珠轴承作为AMB系统中的辅助轴承直接安装在转子上。这些滚珠轴承的外圈被这些支撑件包围。在打开位置，滚珠轴承的外圈和倾斜支撑之间存在初始保护间隙。当轴承安装的转子由于AMB故障而掉落在这些支架上时，滚珠轴承的外圈和倾斜支架之间的摩擦力使这些支架旋转，从而消除了游隙，并使转子重新定位。由于消除了间隙，消除了转子向后旋转的可能性。运动学分析了该装置的运动机理。从静力学的角度讨论了这些支架的旋转，消除了保护间隙以及消除了间隙后的转子旋转稳定性。此外，开发了初步的原型实验台，以证明AMB系统故障后ACABD的可行性。实验结果表明，在AMB系统发生故障后，ACABD立即消除了滚珠轴承外圈与支撑之间的间隙，并将转子中心推至初始位置。

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