Performance Assessment of Auxiliary Bearing in HTR-10 AMB Helium Circulator on the Event of Rotor Drop
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摘要: 基于Hertz接触理论,提出一种由转子轴心位移数据推算球轴承内部接触应力以及外部载荷的计算方法,将其应用于HTR-10磁力轴承氦风机转子跌落实验,并分析转子跌落后不同阶段辅助轴承的承载特性。结果表明,辅助轴承能很好地抵御转子跌落产生的轴向冲击,不会在辅助轴承内部产生严重的塑形变形,对辅助轴承工作性能不会产生影响。另一方面,转子的回转运动以及初始急加速时内圈上的热积聚是转子惰转过程中辅助轴承径向载荷的主要来源,也是导致辅助轴承失效的重要因素。文中分析了径向载荷的影响,结果表明所选辅助轴承方案仍可以满足跌落要求。Abstract: In this paper, a model for analyzing internal contact stress and external load of ball bearing from rotor displacement was developed based on the Hertz contact theory and applied to the analysis of the rotor drop test in HTR-10 helium circulator equipped with AMB（Active Magnetic Bearing） to gain a better understanding of auxiliary bearing performance at different stages after the rotor drop. It was shown that the auxiliary bearing can well resist axial impact produced by rotor drop, avoiding of internal severe plastic deformation and damage to the performance of the auxiliary bearing. Rotor’s rotary motion and the heat accumulation of the inner ring resulted from the initial acute acceleration are the main contributor of radial load during the rotor idling and may cause the failure of auxiliary bearing. This paper analyzed the influence of this load and confirmed that the auxiliary bearing can still work in its loading limits.
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Key words:
- Hertz contact /
- Auxiliary bearing /
- Rotor drop /
- Deformation /
- Radial overload
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