【作者】 程敏；

【导师】 苏义鑫；

【作者基本信息】 武汉理工大学 ， 控制理论与控制工程， 2008， 硕士

【摘要】 磁力轴承作为一种高科技产品,是支承领域的重大变革。因为其一系列独特的性能使它拥有广泛的应用前景和很高的实用价值。本文的研究对象主要是针对主动磁力轴承转子控制系统,研究的主要目标是应用鲁棒H_∞原理设计磁力轴承控制器,同时给出主动磁力轴承系统的硬件设计框架。首先,本文简要的介绍了磁力轴承的基本工作原理,对磁力轴承磁场中的电磁力进行了计算推导,同时建立了磁力轴承系统的数学模型,为后面的分析奠定基础。其次,通过磁力轴承系统的不确定性分析,介绍了关于H_∞控制标准设计问题的描述,进而利用H_∞控制理论的混合灵敏度方法,根据系统受扰情况选择合适的加权函数,设计出能使该系统稳定且具有良好鲁棒性的H_∞控制器,其中对加权函数的选择原则作了比较详尽的阐述。再次,借用MATLAB工具,通过计算机仿真将H_∞控制器和PID控制器的控制效果进行了对比,并分析了各种情况下系统的起浮性能。仿真实验验证了利用H_∞混合灵敏度理论设计的单自由度H_∞控制器的闭环系统具有良好稳定性和鲁棒性,对干扰信号和不确定参数具有令人满意的抑制效果。最后,介绍了基于DSP芯片TMS320LF2812设计的磁力轴承系统的控制器,并以其为中心详尽地对A/D通道设计,D/A通道设计作出必要的说明。为了构成完整的磁力轴承控制系统,本文也给出了包括滤波电路在内的各种必要的外围电路,如电源电路,仿真接口等。除此之外,传感器和功率放大器也是构成磁力轴承系统的重要组成部分,在文章中给出了选择和设计的方法。在文章的最后对本论文做了思考性的总结,同时对课题进一步要开展的工作作出一些思考。更多还原

【Abstract】 Magnetic Bearings, as one kind of high tech products, is called as a important technology revolution of the supporting domain. Because of a series of unique properties, it has wide application potential and inestimable practical value. The main objective of research of this paper is designing control system with the robust H_∞principle for active magnetic bearings rotor system, Simultaneously ,the hardware design frame of the active magnetic bearings system has been given in the paper.Firstly the principle of the magnetic bearing is introduced briefly and themagnetic force of the magnetic bearing magnetic field is analysed and computed,and mathematical model of the magnetic bearing systems is established in this paper,all this is making foundation for the following analysis and the next works.Secondly, by analysising the uncertainty of the magnetic bearing system,the paper introduced the standard H_∞control designing question description, then use the mixed sensitivity function of H_∞control theory designing H_∞controller, which has good robustness and can enable the system to stabilize, according to the disturbed situation in choosing suitable weighting function. In addition, the article introduced the Selection principle of weighting function in detail.Thirdly, using MATLAB tools and computer simulation the control effect of the H_∞controller and the PID controller were compared, then the floating system performance from a variety of circumstances is analyzed. Simulation results verify the active magnetic bearing system which is designed whit H_∞mixed sensitivity theory has good stability and robustness .It can be very good suppression of low frequency interference signals.Finally, the paper introduced the designing of the magnetic bearing system controller based on the chip DSP named TMS320LF2812 . On this basis, the A/D channel designing and the D/A channels designing had a detailed presentation. In order to construct a complete magnetic bearing system control system, the paper also presents the filter circuit, including the necessary peripheral circuits, such as power supply circuit, simulation interface. In addition, sensors and power amplifier is an important component of a magnetic bearing system, the article finally given the selection and design methods.At the end of the article, I has made the ponder summary to the present paper, simultaneously the work which further must develop to the topic has made the ponder.更多还原