基于LF2407A DSP的主动磁轴承数字控制系统的研究

【作者】 张爱林；

【导师】 徐龙祥；

【作者基本信息】 南京航空航天大学 ， 机械设计与理论， 2004， 硕士

【摘要】 主动磁轴承是一种新型、高性能轴承，由于转子与定子之间不存在机械接触，转子可以达到很高的运转速度，几乎没有磨损，因而具有寿命长、能耗低、噪声小，无需润滑的优点。在很多应用领域内与传统轴承相比，表现出了明显的优越性。 本文在分析电磁轴承工作原理的基础上，建立了五自由度磁轴承转子的力学模型，并结合一套磁悬浮实验台的结构参数，得到了该实验台转子的力学模型。为控制器的设计打下了基础。 为了保证磁轴承控制系统的实时性，完成越来越先进、复杂的控制算法，就要求CPU的运算速度足够快，因此，本论文采用了美国TI(Texas Instruments)公司的C2000系列成熟产品中目前最新、运算速度最快的一块DSP芯片TMS320LF2407A作为磁轴承数字控制器的主CPU，设计了控制器的硬件系统。之后，建立了带附加超前PID控制器的模型，对该PID控制器进行了数字化，推导出了适合于数字控制的差分方程，并用DSP汇编语言编制了控制程序，实现了磁悬浮转子的稳定悬浮。为了实现对磁轴承系统的模拟调试，研制了模拟调试用的DDS(Direct Digital Synthesis)信号源，并利用该信号源完成了控制参数的整定，实现了5自由度磁悬浮转子的高速稳定运转(在本实验台中，转速达30，000转／分)，电控系统稳定性好、重复性好，其控制精度达到了预期的效果。更多还原

【Abstract】 Active Magnetic Bearing (AMB) is a kind of novel high-performance bearing , because of the contact-free property between the rotor and stator , the rotor can rotate at very high speed , with almost no wear . So AMB has the advantages of long lifetime , low power loss , low noise and no lubrication . Thus AMB shows obvious advantages over conventional bearing in many application fields .The thesis educed the mechanics model of five-degree freedom rotor of magnetic bearing based on the analysis of the operation principle of AMB . Combining the mechanical parameters of a set of AMB flat for experiments , we get the mechanics model of this flat. Above work give a foundation for controller design .Ensuring the real-time operation of the control system of AMB , and making the CPU complete more and more advanced , complex control algorithms , the operation speed of CPU must be rapid enough . So this thesis used a piece of DSP chip : TMS320LF2407A, produced by TI(Texas Instruments) company of America to act as main CPU of our digital controller of AMB , and designed the hardware of the controller . This DSP chip is newest, fastest DSP of TI company’s C2000 product pipeline these years . Then , this thesis provide a PID control model with a phase increased tache , and the digital difference equations which were fit for digital control algorithm of AMB are produced . Using these difference equations , a digital control software was weaved in DSP assembly language . The rotor can be suspended stably with the control of these control hardware and software . Next , in order to realize simulation debugging under static suspension condition , this thesis developed a DDS(Direct Digital Synthesis) signal generator specially designed for control parameters debugging , and the control parameters for high speed operation of AMB were established with the help of this DDS signal source . At last, the five-degree freedom magnetic rotor can be stably suspended and rotated at high speed(this AMB experiment flat can rotated stably 30,000 rounds per minute) . The stability and iteration performance of this digital control system were good , and the control precision has reached anticipated performance request.更多还原