【作者】 薛斌；

【导师】 胡业发；

【作者基本信息】 武汉理工大学 ， 模式识别与智能系统， 2007， 硕士

【摘要】 主动磁力轴承(简称磁力轴承)是利用可控的电磁力将转子稳定地悬浮在空中，实现转子和定子之间无机械接触的一种新型的高性能轴承。由于其具有无磨损、无需润滑、寿命长、能耗低、振动和噪声小等传统轴承无法比拟的优点，在航空航天、能源、交通、超高速精密加工等领域有着广阔的应用前景。控制系统是磁力轴承系统的重要组成部分，其性能的好坏直接影响磁力轴承系统的性能。本文对磁力轴承控制系统的硬件和控制算法做了研究与实验，主要工作如下：首先，在分析了磁力轴承嵌入式控制系统的硬件响应速度和精度的基础上，根据磁力轴承控制系统的需要，本文设计了以单片TMS320LF2407A DSP为核心控制器的高性能控制平台，集成了多通道高速同步A／D采样模块、高速D／A模块、多种数据通信接口和实时数据显示等模块，本设计提高了磁力轴承系统的集成度和可靠性，降低了系统的成本。其次，为解决传统两电平功率放大器的动态性能的提高、电流纹波的减小和开关损耗的减小三者之间的矛盾，本文研究并设计了最大容量为1860VA(310V~*6A)的三电平滞环—最小脉宽功率放大器。实验结果表明该功率放大器可以较好地克服两电平功率放大器的缺点，并具有优良的静态和动态性能。最后，针对传统PID控制算法的局限性和实际磁力轴承的非线性特性，本文进行了基于模式识别的控制算法研究与仿真分析，仿真结果表明该算法可以补偿磁力轴承的非线性，并在保证转子稳定的前提下提高轴承刚度。本文的研究对磁力轴承系统的集成化技术有一定的意义。更多还原

【Abstract】 Active magnetic bearing (AMB) is a kind of novel high-performance bearing, in which rotor can be suspended stably by controllable magnetic force and realize contact-free property between rotor and stator. Due to its advantages of no friction,no lubrication, longevity, low energy consumption, low vibration and noise and so on, it is much better than traditional bearing and has vast and promising applications in following fields: aerospace, energy, transportation, super-high speed and high precision manufacturing, etc. The control system is an important part of AMB system and influences its performance. This paper makes some research and experiment of hardware design and control algorithm for AMB control system.The main works are as follows:First,according to the needs of control system for AMB,and on the base of the analysis of response speed and precision of conrtol system for AMB embedded control system.This research designed a high-performance control platform based on a single DSP:TMS320LF2407A.It integrated multi-channel high-speed synchronous A/D module,high-speed D/A module,versatile communication interfaces and real time data displayer module.This design increases the integration and reliability of system,and reduces the cost.Second,a power amplifier called three-level Hysteresis-MPW(Minimum Pulse Width) with the maximum capacity of 1860VA(310V*6A) is researched and designed to overcome the contradiction of improvement of dynamic performance, reduction of current ripple and reduction of switching power losses of two-level power amplifier. The experimentation results demonstrate that it can overcome the drawbacks of two-level power amplifier and has good steady and dynamic performance.Finally,a control algorithm based on pattern recognition is researched in this paper aiming to the limits of PID and nonlinear characteristic of real AMB, the simulation results of this algorithm prove that it can compensate the nonlinearity of AMB and also improves the stiffness of bearing on the base of rotor’s stability.This research has a contribution to integration technology of AMB system.更多还原