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首页> 外文期刊>Journal of Engineering for Gas Turbines and Power >Dynamic Analysis of Active Magnetic Bearing Rotor Dropping on Auto-eliminating Clearance Auxiliary Bearing Devices
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Dynamic Analysis of Active Magnetic Bearing Rotor Dropping on Auto-eliminating Clearance Auxiliary Bearing Devices

机译：自动消除间隙辅助轴承装置上主动磁轴承转子掉落的动力学分析

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摘要

Auto-eliminating clearance auxiliary bearing devices (ACABD) can automatically eliminate the protective clearance between the ball bearing's outer race and the ACABD's supports, thus recenter the rotor when active magnetic bearing (AMB) system fails. This paper introduces the mechanical structure and working principles of the ACABD. When the rotor drops, numerical and experimental studies on the transient responses of the rotor and the ACABD's supports are also conducted as follows. First, we propose an equivalent clearance circle method to establish dynamic models of rotor dropping on the ACABD. Based on these models, the rotor dropping simulations are carried out to investigate the modes of lubrication and the ACABD's support shape's influences on the performance and execution time of clearance elimination. Second, various AMB rotor dropping tests are performed on our experimental setup with different ACABD supporting conditions. Indicated from the basically consistent simulation and experimental results, the correctness of the theoretical analysis and the successful operation of ACABD have been verified. Moreover, with the grease lubrication in the ball bearing and convex shape supports, the ACABD can eliminate the protective clearance within approximately 0.5 s upon the rotor drops and then sustain the rotor to operate stably around its original rotation center. Because of clearance elimination, the dramatic impact between the ball bearing and the supports is avoided and the impact forces among each part are effectively reduced. Meanwhile, the possibility of incurring full-clearance backward whirling motion is eliminated.
机译：自动消除间隙辅助轴承装置（ACABD）可以自动消除滚珠轴承外圈与ACABD支撑之间的保护间隙，从而在主动电磁轴承（AMB）系统出现故障时使转子重新居中。本文介绍了ACABD的机械结构和工作原理。当转子掉落时，对转子和ACABD支架的瞬态响应的数值和实验研究也如下进行。首先，我们提出了一种等效的游隙圆法来建立转子在ACABD上下落的动力学模型。在这些模型的基础上，进行了转子下落模拟，以研究润滑方式以及ACABD的支撑形状对间隙消除性能和执行时间的影响。其次，在我们的实验装置上使用不同的ACABD支持条件进行了各种AMB转子跌落测试。从基本一致的仿真和实验结果表明，已经验证了理论分析的正确性和ACABD的成功运行。此外，通过在球轴承和凸形支撑件中进行脂润滑，ACABD可以在转子掉落后约0.5 s内消除保护间隙，然后维持转子在其原始旋转中心附近稳定运行。由于消除了间隙，避免了滚珠轴承和支撑之间的剧烈冲击，并且有效地减小了各个部件之间的冲击力。同时，消除了引起全间隙反向旋转运动的可能性。

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