研究生论文-磁悬浮.doc

摘要
主动磁悬浮轴承是一种典型的机电一体化产品,是一种新型的高性能支承部件。由于其具有诸多优点,从而应用需求越来越广。但由于技术复杂、难度大等原因,目前国内的磁悬浮轴承研究大多处于实验室阶段。
根据工程应用需要,在满足控制性能要求情况下,本着成本低、系统结构简单的原则,对轴向磁悬浮轴承及控制系统进行研究设计。
主要工作体现在:
(1)根据具体的应用要求,建立相关的数学模型,对轴向磁悬浮轴承的机械结构和电磁线圈进行设计。
(2)针对轴向磁悬浮轴承的特点,对位移检测进行分析研究,设计具有结构简单、动态特性好、精度高、成本小等优点的电容位移传感器作为磁悬浮轴承检测装置。
(3)通过对磁悬浮轴承常用控制实现方法研究,采用脉宽调制信号控制线圈开关的思想,省去功率放大器的设计,简化了控制系统结构。
实现了自行设计的电容位移传感器在磁悬浮轴承中进行位移检测的运用,以及无须专门进行功率放大器设计的控制系统设计。所设计的轴向磁悬浮轴承控制精度高,具有一定的承载能力和刚度,抗外界扰动性能强;且成本较低,控制系统结构得到了简化。
关键词:轴向磁悬浮轴承,电容位移传感器,差动激励,PID控制
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Abstract
Active ic Bearing (AMB) is one of typical mechatronics products and a new type high performance ponent. It is being extensivly demanded for application, because of its many merits. However, due to plexity, difficulty and other reasons, the current domestic study of ic bearings is mostly being in the laboratory stage.
Based on the applicative needs of a project, in a less costs ,simple structure,and meeting the control performance, the entire axial ic bearing and control system is studied and designed.
Main work reflects on:
(1) According to the specific requirements of application, the mathematical model is established ,the mechanical structure and ic coil of the axial ic bearing are designed.
(2)According to the characteristics of the axial ic bearings and the study of the displacement detection, the capacitance displacement sensors with the advantages of simple structure, good dynamic characteristics, high precision and low costs, is desinged as the detection device of ic bearing.
(3) By studying men control methods applied in ic bearings, we creatively design the PWM signal to control coil switch, and simplify the structure of control system without the power amplifier design.
The application of self-designed capacitance displacement sensor which is used in the ic bearing as the detection device and the design of control system without devoting to the power amplifier design are essfully realized in this paper. The axial ic bearing designed has the a