磁悬浮轴承位移检测
摘要磁悬浮轴承是一种利用电磁效应使得轴悬浮于轴承当中，使轴不与轴承直接接触的一种轴承。这种不直接接触的特性使得磁悬浮轴承能够达到极高的速度，拥有极低的发热、噪声、功耗，同时运转过程中基本无摩擦损耗，可以长时间的保持高可靠的运行。因此磁悬浮轴承被运用在各种需求高速运行或者长时间无人维护的机械中，比如，硬盘驱动器、高速离心分离器、真空泵等等。但也正是由于磁悬浮轴承没有机械接触这一特性，使得我们必须实时的对转轴的位移进行高精度闭环反馈控制，这就要求我们设计出很高精度与灵敏度的传感器和检测电路。本文通过对多种不同传感器进行综合对比，最后选择了电涡流传感器进行位移检测，并且设计出配套的检测电路。63542
毕业论文关键词 磁悬浮轴承 电涡流传感器 检测电路
毕业设计说明书（论文）外文摘要
Title Detection Of the Displacement Of Magnetic Bearing
Abstract
The magnetic bearing is a kind of bearings which use electromagnetic technology,so that the shaft can be suspended in bearings and can be made not being direct contact with the bearings.With this feature the magnetic bearing can achieve an extremely high speed,a lower heat,noise and power consumption.It almost has no friction during the operation,so it can be prolonged to highly reliable operation without manual maintaining.Therefore,magnetic bearings are used in a variety of machines which need high-speed operation or no manual maintenance for long time,such as hard disk drives,high-speed centrifugal separators,vacuum pumps and so on.But it is precisely because there is no mechanical contact between the bearing and the shaft,wo habe to live on the shaft displacement precision close-loop feedback control,which requires us to design a very high accuracy and sensitivity of the sensor and detection circuit.Based on a comprehensive comparison of different sensors,wo finally choosed the eddy current displacement sensor detection,and have designed a matching detecton circuit.
Keywords Magnetic Bearing Eddy current sensor Detection circuit）
目 录
1. 绪论 4
1.1 磁悬浮轴承简介 4
1.2 磁悬浮轴承发展历程 4
1.3 磁悬浮轴承对位移检测的要求 5
1.5 课题研究与任务 6
2. 位移检测技术研究 7
2.1 传感器选择 7
2.2 电涡流传感器 9
2.3 检测电路设计 9
结 论 27
致 谢 28
参考文献 29
1. 绪论
1.1 磁悬浮轴承简介
磁悬浮轴承(Magnetic Bearing) 是利用磁力作用将转子悬浮于空中，使转子与定子之间没有机械接触。磁悬浮轴承没有摩擦发热和损耗方面的问题，就使得磁悬浮轴承可以应用到各种告诉高速、长时间、极端条件下的运转的工程器械中[5]。