Measurement and calibration of rotor/touchdown bearing contact in active magnetic bearing systems
Measurement and calibration of rotor/touchdown bearing contact in active magnetic bearing systems
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DOI：
10.1016/j.ymssp.2018.12.005
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发表时间：
2019-05
影响因子：
8.4
通讯作者：
F. Y. Saket;M. Sahinkaya;P. Keogh
中科院分区：
文献类型：
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作者：
F. Y. Saket;M. Sahinkaya;P. Keogh
主动磁轴承系统提供无接触转子悬浮，使其在正常运行时几乎无摩擦旋转和高转速。在一定的运行条件下，可能会发生暂态故障、过载或扰动。因此，在这样的系统中实施着陆轴承或衬套，以防止转子和定子片之间的接触。如果转子与着陆轴承接触，转子的动力学可能会变成短暂的或持续的接触。通过磁轴承恢复无接触转子操作的适当控制策略可以延长着陆轴承的寿命，并最大限度地减少操作停机时间。要实现这一点，需要了解接触动力学，以及接触和磁轴承力之间的关系。采用带柔性转子的主动磁轴承系统，对转子与着陆轴承的接触条件进行了实验研究。设计方法提出了一个测量系统，能够提供转子/着陆轴承接触相关数据，基于应变测量。应变感应接触信号根据施加的磁轴承力进行校准。使用评估的力和相位测量来考虑主动磁轴承系统的频率依赖行为。测量数据代表了主动磁轴承基于力的接触控制潜力的系统识别。
Active magnetic bearing systems provide contact-free rotor levitation, which allows near frictionless rotation and high rotational speeds when they operate normally. Under certain operational conditions, a transient fault, overload condition, or disturbance may occur. Touchdown bearings or bushings are therefore implemented in such systems to prevent contact between rotor and stator laminations. If the rotor makes contact with a touchdown bearing, the rotor dynamics may become transient or persistent in contact. Appropriate control strategies through the magnetic bearings to restore contact-free rotor operation may extend the life of touchdown bearings, and minimise operational downtime. To achieve this, an understanding of the contact dynamics is required, together with the relationship between contact and magnetic bearing forces. In this paper, rotor/touchdown bearing contact conditions are investigated experimentally using an active magnetic bearing system with a flexible rotor. Design methodology is presented for a measurement system capable of providing rotor/touchdown bearing contact related data, based on strain measurement. Strain induced contact signals are calibrated against applied magnetic bearing forces. The frequency dependent behaviour of the active magnetic bearing system is considered using evaluated force and phase measurements. The measurement data represent system identification for the potential of active magnetic bearing force-based contact control.