【作者】 胡美君；

【导师】 阮健；

【作者基本信息】 浙江工业大学 ， 机械电子工程， 2007， 硕士

【摘要】 本论文的主要工作是将正交正弦波细分驱动和连续跟踪控制算法相结合，着眼于提高系统的频响特性，设计适合微小数字伺服阀的步进电机驱动器的研究。微小流体控制系统由于其输出功率体积比大、重量轻、频率响应和精度高等特点，应用场合越来越多。电液伺服控制系统的性能好坏，一方面取决于伺服阀结构的本身，更重要的是取决于它的电-机械转换器性能的好坏。本文根据目前电-机械转换器的种类和特点，首次把步进电机正弦波细分驱动和连续跟踪控制算法相结合，设计了步进电机驱动器，运用到微型电液伺服控制系统中。实验证明，该方法有效的提高了系统的频响能力。本论文的主要工作如下：第一章综合国内外的有关文献，本章首先介绍了阀用电-机械转换元件，包括传统式和新型的电-机械转换元件。接着介绍了目前微小数字阀的控制方法。在此基础之上，提出了课题的选题意义及创新点与主要研究内容，并简要介绍了产品的应用前景。主要研究内容为：阀的结构设计、正弦波驱动与连续跟踪控制算法、步进电机驱动器的设计与实现、实验结果分析。第二章为测试驱动器的性能，设计了直动式数字电液微小伺服阀。在简化为理想零开口滑阀的前提下，计算了阀的各项系数。分析了阀芯的位置、移动速度和角度的关系，并对该关系的非线性进行了分析。另外，计算了运动部件的转动惯量和液动力。计算表明，由阀和电机组成的系统中，转动惯量95.2％集中在电机的转子上；而由液动力产生的折算到电机轴上的力矩只占电机输出力矩的0.32％。这说明，所设计的电—机械转换接口系统是否工作在带载荷状态，对系统的频响特性的影响可以忽略。这为后面实验里直接用阀心的运行状态，而不是阀的流量输出，作为评价系统频响特性的好坏提供了理论依据。第三章介绍了步进电机的特点、分类、工作原理及其控制方法。着重介绍了步进电机的正弦波细分驱动和连续跟踪控制算法，建立了连续跟踪算法下步进电机的模型。仿真结果表明，连续跟踪算法有效的提高了阀芯的频响能力。第四章主要介绍了基于正弦波细分驱动和连续跟踪控制算法的步进电机驱动器的设计和实现。包括系统硬件的具体设计、软件的实现和整体功能，详细地介绍了系统的硬件电路和软件的具体实现方案。第五章介绍了实验的原理、实验装置，并对获得的实验结果进行了分析和讨论。实验证明，采用步进电机正弦波细分驱动和连续跟踪算法，有效提高了系统的频响特性。第六章全文总结和后续展望。更多还原

【Abstract】 This thesis focuses mainly on the design of a kind of stepping motor driver which imbedded with sinusoid wave subdivision together with a smooth tracking control algorithm.Due to its large power output versus volume, light-weight, high-frequency response and high-accuracy, microvalve is applied in more and more fields. The performance of servo control system in a electro-hydraulic system depends not only on the servo valve structure of itself, but also, in some cases even more heavily , on the performance of the electrical to mechanical converter applied as well.According to the characteristics of the microvalve designed, A method of sinusoid wave subdivision microstep driver together with a smooth tracking control algorithm is applied in this electric-hydraulic servo control system. Experiments have been done and the results demonstrated that the characteristics of frequency response of the controller is improved significantly. The main tasks of this thesis are as follows:Chapter 1: some traditional electrical to mechanical converters that used in valve, both at domestic and abroad, are introduced at first. Then the innovation points and main research contents of this project are proposed, and the application prospect is introduced briefly as well. The main research contents are as follow: the structural designs of microvalve; sinusoid wave subdivided drive and smooth tracking control algorithm; designing a stepping motor driver, both hardware and software; experiments and result analysis.Chapter 2: A structure of direct digital electro-hydraulic servo microvalve is developed, and a simplified model is established as well. The coefficients of the microvalve developed are calculated. The relationships such as the position of spool versus rotation angle, the speed of spool versus rotation angle and ect., are analyzed respectively. The nonlinearities of the relationships proposed above are also analyzed as well. In addition, the moment of inertia and dynamic hydraulic force are calculated. The results show that, in this motor-valve system, more than 95% inertia toque is caused by stepper motor rotor itself; and also, Bernoulli force is much smaller than that output by motor. Therefore, the influence to the motor-valve system frequency characteristic can be neglected. This lays a theoretical foundation for the experiment that the dynamic motor can be used to evaluate the performance of the microvalve. Chapter 3: The characteristics, classification, operation principles and control methods of stepping motor are discussed. Sinusoid wave subdivided drive and smooth tracking control method are mainly introduced. A model of stepping motor according to this control method is established. The simulation results show that this control method is effective to improve the frequency response characteristics of the microvalve which has been designed.Chapter 4: The design and realization of stepping motor driver imbeded with smooth tracking control algorithm is introduced. The system function is introduced at first, then followed the design of hardware and software. Hardware circuit and software are discussed in detail.Chapter 5: The scheme of experiment and experimental equipments used are introduced. The experimental results are further analyzed and discussed. Although the experiment results in some cases are not as good as those got in the simulation, still, experiment results agree with the simulation results. This proves that the sinusoid wave subdivided drive together with smooth tracking control algorithm is effective to improve the performance of the system.In Chapter 6: the summarization of this dissertation and the prospect of this project.更多还原