Large external disturbances (such as shock loads) can cause contact between the rotor and touchdown bearings (TDBs). Hence, maintaining the stability of systems with active magnetic bearings (AMBs) is a major challenge for mobile applications such as on-board steam turbines or vehicle turbochargers. In this paper, two key factors (power bandwidth and bi-stable characteristic) that affect the shock stability of AMB-rotor systems are considered in the design of a high-speed maglev motor. Insufficient power bandwidth can induce current saturation leading to destabilization, while a bi-stable characteristic can cause persistent contact between the rotor and TDBs under external disturbances. Theoretical analyzes and criteria are provided, and the influence of these two factors is investigated by base shock experiments of a high-speed maglev motor. These experiments involved mounting a high-speed maglev motor on a shock table then subjecting it to shock loads of different amplitudes. The designed motor continued to operate stably under shock loads up to 20 G, verifying the correctness of the stability considerations.

中文翻译：

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高速磁浮电机抗冲击设计——稳定性考虑及定量冲击试验

较大的外部干扰（例如冲击载荷）会导致转子和接地轴承 (TDB) 之间发生接触。因此，保持具有主动磁轴承 (AMB) 的系统的稳定性是车载蒸汽轮机或车辆涡轮增压器等移动应用的主要挑战。在本文中，在设计高速磁悬浮电机时，考虑了影响 AMB 转子系统冲击稳定性的两个关键因素（功率带宽和双稳态特性）。功率带宽不足会导致电流饱和导致不稳定，而双稳态特性会导致转子和 TDB 在外部干扰下持续接触。提供了理论分析和判据，并通过高速磁悬浮电机的基础冲击实验研究了这两个因素的影响。这些实验包括将高速磁悬浮电机安装在冲击台上，然后使其承受不同幅度的冲击载荷。设计的电机在高达 20 G 的冲击载荷下仍能稳定运行，验证了稳定性考虑的正确性。