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磁悬浮轴承转子位移检测技术 总被引:1,自引:0,他引:1
在综述电涡流式、电感式、电容式、光电式等几种主要位移传感器原理、性能及其适用范围的基础上,分析使用位移传感器所带来的一系列问题,论述了磁悬浮轴承无传感器技术的基本思想,并比较了几种磁悬浮轴承无传感器检测方法的优缺点.最后,对磁悬浮轴承位移检测技术的发展趋势做了进一步阐述. 相似文献
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为了满足磁悬浮轴承系统高精度的位移检测要求,必须对位移传感器的测量电路参数进行优化设计。文章从电涡流传感器的原理出发,介绍了谐振检测电路的工作原理,分析了谐振检测电路各参数对灵敏度的影响,提出了谐振测量电路参数优化的方法,利用这种参数优化方法来提高电涡流位移检测传感器的灵敏度简单、切实有效。 相似文献
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横向磁通传感器因结构紧凑和高检测精度在磁悬浮轴承系统中具有广阔的应用前景。 随磁悬浮轴承技术的发展,对横
向磁通传感器的检测性能提出了更高要求。 为进一步提升横向磁通传感器的性能,满足磁悬浮转子高精度位移监测需求,本文
针对灵敏度指标对传感器进行设计与分析。 通过建立传感器的数学模型和电磁场有限元分析,研究了激励频率和线圈参数之
间的关系。 对传感器线圈匝数与灵敏度的相关性进行了数值研究,从检测转子的角度分析了趋肤效应对传感器灵敏度的影响。
设计了传感器信号处理电路实现由位移信号到电压信号的转换,并搭建实验平台对传感器的输出特性进行测量。 实验结果表
明,当灵敏度为 20 mV/ μm、检测范围为±500 μm 时,传感器的线性度为 0. 69% ,且具有良好的动态特性,适用于磁悬浮轴承系
统的转子高精度径向位置检测。 相似文献
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在综述电涡流式、电感式、电容式、光电式等几种主要位移转感器原理、性能及其适用范围的基础上,分析使用位移传感器所带来的一系列问题,论述了磁悬浮轴承无传感器技术的基本思想,并比较了几种磁悬浮轴承无传感器检测方法的优点.最后,对磁悬浮轴承位移检测技术的发展趋势做了进一步阐述. 相似文献
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根据涡流位移传感器的工作原理及其在磁悬浮转子系统中的应用,介绍磁悬浮转子的工作环境以及对传感器的影响,分析涡流传感器在变化磁场环境下的误差来源以及表现形式,设计实验并测试了涡流传感器在变化磁场环境中的工作特性。实验结果表明:磁力轴承的变化磁场以及磁滞特性也是影响涡流传感器测量精度的一个重要原因,磁悬浮转子检测系统需要考虑磁场环境对测量精度的影响,对进一步提高磁悬浮转子的控制精度具有重要的参考价值。 相似文献
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国内轴承生产厂商主要是采用量规、卡尺对轴承高度进行手动测量,测量效率低,容易造成疲劳操作带来经济损失。现设计了一种基于单片机的无内圈、冲压外圈轴承的高度自动测量装置。该装置采用电感式位移传感器,将高度尺寸的变化值转变为传感器输出电压值,由AT89S52单片机作为控制芯片构成的测量系统,很好地适应了快速的生产节拍需求,并利用VB开发人机界面。该测量装置能精确地测量这种轴承的高度,自动化效率高,满足了生产需求,是一款实用的测量装置。 相似文献
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磁悬浮轴承位置控制系统中,因使用的电涡流位移传感器存在较大的温度漂移而导致位置控制精度不够高。为解决此问题,设计了一种位移差动检测与控制电路,用差动测量的方法减小温漂和其他干扰的影响。实验表明,与用单一位移传感器直接测量的方式相比,此法能较好地提高磁悬浮轴承位置控制精度。 相似文献
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磁力轴承刚度的实验测量方法 总被引:2,自引:0,他引:2
在磁力轴承研究中关于磁力轴承刚度存在两种不同的定义,从转子受力分析和控制系统传递函数角度看,这两种刚度定义之间存在差异。针对两种不同的刚度定义分别给出了其测量方法,并设计了磁力轴承刚度测量的实验系统。该实验系统可以实现磁悬浮转子静态悬浮、刚性旋转和柔性旋转工作状态下的刚度测量。 相似文献
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飞轮储能磁轴承系统结构及其悬浮特性 总被引:1,自引:2,他引:1
介绍了一种由径向永磁轴承与电磁推力轴承组成的单轴主动控制的飞轮储能磁轴承系统结构 ,径向永磁轴承提供径向恢复力与轴向悬浮力 ,电磁推力轴承提供轴向恢复力。并对系统的结构参数计算及其磁悬浮特性进行了分析与讨论。研究结果表明 ,永磁轴承动、静磁环轴向位移对系统承载力与刚度有明显影响 ,采用多对磁环永磁轴承 ,有利于提高系统承载力与径向刚度 相似文献
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Seung-Kook Ro Jong-Kweon Park 《International Journal of Precision Engineering and Manufacturing》2011,12(1):115-119
We designed a novel surface motor stage supported by air bearings and driven by linear electromagnetic motors. This compact
and simple planar stage is proposed for compact-sized precision machine systems, such as micro-machine tools or measurement
systems requiring minimum X-Y stage height. Four single-phase linear motors with coils and iron cores are located under the
base plate, and air bearings and cores with permanent magnets are attached under the moving table. The hard, non-magnetic
alumina-ceramic base plate surface acts as a planar guide for the air bearings. The attractive magnetic force between the
magnets and motor cores preload the air bearing to increase vertical stiffness. By simultaneously combining actuations of
the motors, linear X and Y motion can be controlled, and angular motions can also be generated. A grid encoder is used to
control planar motion, and the system is run by a programmable numerical controller. The thrust and attractive force were
calculated using a magnetic circuit model. The designed prototype is 220 (L) × 220 (W) × 66 (H) mm3 in size with a 20 mm × 20 mm range of motion. After fabrication, basic aspects of the prototype, such as vertical stiffness
and thrust force, were evaluated. Twenty nanometers of positioning resolution was obtained for the X and Y axes, and the three
motions could be controlled independently. 相似文献
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Dynamic tilt characteristics of aerostatic rectangular double-pad thrust bearings with compound restrictors 总被引:1,自引:0,他引:1
Aerostatic rectangular double-pad thrust bearings with compound restrictors have often been used in linear guideway systems of ultra-precision machine tools and precision measuring equipments, because high bearing stiffness is easily achieved in these bearings. However, in actual devices, various dynamic loads as well as static loads are imposed on these aerostatic bearings. Therefore, in this paper, the dynamic stiffness and damping coefficient of this type of bearing for tilt motion of a shaft are investigated, both theoretically and experimentally. It was consequently found that the dynamic tilt characteristics of the aerostatic thrust bearings considered in this paper are greatly influenced not only by design parameters such as the groove position and the groove depth but also by the squeeze effect. 相似文献
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推力盘发热对电磁轴承-转子系统静态精度的影响 总被引:2,自引:0,他引:2
以膨胀机为例建立了稳态条件下轴向温度的线性分布方程 ,并以此为基础讨论由于温度变化分别通过转子热膨胀和传感器温漂对电磁轴承 -转子系统静态精度的影响以及控制途径 相似文献
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Jerzy T. Sawicki Eric H. Maslen Kenneth R. Bischof 《Journal of Mechanical Science and Technology》2007,21(6):847-850
Active magnetic bearings (AMBs) are increasingly employed in the machine tool industry to exploit their advantages over classical
bearings such as high speed capability, rotation accuracy, high stiffness, and accurate displacement tracking capability.
Furthermore, the possibility of on-line monitoring of the machining process (e.g., cutting force measurement, tool wear) makes
AMB spindles very appealing to the High-Speed Machining (HSM) industry. Despite significant progress already reached in HSM
technology, there remain numerous open challenges in modeling and control of magnetic bearings as applied to machining spindles.
These include optimum control given AMB magnetic saturation levels, management of nonlinear effects, reduction of chatter,
and rotor properties. This paper describes a five-degree-of-freedom, high-speed machining spindle supported on AMBs. The rotordynamic
modeling and experimentally extracted transfer functions are presented and analyzed. The experimentally measured tool tip
compliance is used to compare PID and mu-synthesis control schemes. The primary finding is that the achieved tool tip stiffness
is substantially higher with the μ-synthesized controllers than with the best PID we were able to design. 相似文献