直驱泵控伺服液压机动态特性与节能机理研究

发布时间：2018-06-29 22:21

本文选题：直驱泵控液压系统 + 交流伺服电动机　；参考：《广东工业大学》2012年硕士论文

【摘要】：直驱泵控伺服液压机采用定量泵和交流永磁同步电机作为动力单元,该伺服液压系统,依靠改变电机转速实现系统流量调节,从而实现对液压系统的控制。与传统的阀控系统不同的是,采用伺服电机和定量泵取代异步电机和变量泵的组合,具有体积小、高效节能、可靠性高等特点,被公认为液压控制系统中最重要的发展方向之一,但直驱泵控系统动态特性不高等问题限制了其更广泛的应用。本文的主要任务是针对伺服液压机的要求进行直驱泵控电液伺服系统的研究,阐述了系统的原理、组成和特点。为了进一步拓宽系统的应用前景,研究系统动态特性与节能机理,具体研究内容如下： (1)在查阅大量国内外相关文献的基础上,综述了国内外对直驱泵控伺服液压系统的研究概况,通过阐述矢量控制的基本原理,并基于这一原理分别建立了交流异步电动机和交流永磁同步伺服电动机的数学模型。阐述了Matlab/Simulink建模与仿真的基本原理和方法,以交流永磁同步伺服电动机为执行电机,运用Simulink和传递函数法分别建立交流调速模块和泵控缸模块的仿真模型,并在此基础上进行了大量计算机仿真测试与分析。 (2)通过改变系统结构参数,分析各参数对系统动态特性的影响,提出了改善系统动态特性的可行措施。 (3)以盒形件拉深加工为实例,建立了其各个工序动作过程液压系统的数学模型和仿真模型,针对一个工作循环周期内能耗进行了分析与计算机仿真,并将其与普通多功能拉深液压机进行了比较分析。 (4)搭建直驱泵控伺服液压试验台,进行了试验研究,比较实际系统在不同结构参数时的动态特性,将试验研究与理论分析结合,全面、系统地分析系统动态特性；在直驱泵控伺服液压机样机上进行拉深工艺能耗对比试验,检验其节能效果。研究表明,容积调速的特点制约着直驱泵控电液伺服系统的动态特性,但通过采取一些措施还是可以使系统动态特性得到一定提高。主要措施有：合理设计系统结构和选用合适构件,尽量使泵控动力机构具有较高的动态特性。此外,实际应用中还须采取措施减少或避免外界因素对系统性能造成的不利影响。通过仿真与样机试验可得,直驱泵控伺服液压机比普通多功能拉深液压机节约了20%以上的能量。研究结果表明,数值仿真和实验研究二者结果十分吻合,证实了数学仿真模型的正确性。
[Abstract]:The servo hydraulic press controlled by direct drive pump adopts quantitative pump and AC permanent magnet synchronous motor as power unit. The servo hydraulic system realizes the control of hydraulic system by changing the speed of motor to realize the system flow regulation. Different from the traditional valve control system, servo motor and quantitative pump are used to replace the combination of asynchronous motor and variable pump, which have the characteristics of small volume, high efficiency and energy saving, high reliability and so on. It is recognized as one of the most important development directions in hydraulic control system, but the dynamic characteristics of direct drive pump control system are not high, which limits its wider application. The main task of this paper is to study the direct-drive pump controlled electro-hydraulic servo system according to the requirements of servo hydraulic press. The principle, composition and characteristics of the system are expounded. In order to further broaden the application prospect of the system and study the dynamic characteristics and energy-saving mechanism of the system, the specific research contents are as follows: (1) on the basis of consulting a large number of related literature at home and abroad, This paper summarizes the research situation of direct drive pump control servo hydraulic system at home and abroad, and sets up the mathematical models of AC asynchronous motor and AC permanent magnet synchronous servo motor based on the basic principle of vector control. The basic principles and methods of modeling and simulation of Matlab / Simulink are described. The simulation models of AC speed regulating module and pump control cylinder module are established by using Simulink and transfer function method, respectively, using AC permanent magnet synchronous servo motor as executive motor. On this basis, a large number of computer simulation tests and analysis are carried out. (2) by changing the structure parameters of the system, the influence of each parameter on the dynamic characteristics of the system is analyzed. The feasible measures to improve the dynamic characteristics of the system are put forward. (3) taking the box drawing as an example, the mathematical model and the simulation model of the hydraulic system in each working procedure are established. The energy consumption in a working cycle is analyzed and simulated, and compared with the common multifunction drawing hydraulic press. (4) the direct drive pump controlled servo hydraulic test rig is built and the experimental research is carried out. Comparing the dynamic characteristics of the actual system with different structural parameters, combining the experimental research with the theoretical analysis, the dynamic characteristics of the system are analyzed comprehensively and systematically, and the energy consumption comparison tests of the drawing process are carried out on the prototype of the servo hydraulic press controlled by the direct drive pump. Test its energy saving effect. The study shows that the characteristics of volume speed regulation restrict the dynamic characteristics of the direct-drive pump controlled electro-hydraulic servo system, but some measures can be taken to improve the dynamic characteristics of the system. The main measures are as follows: reasonable design of the system structure and selection of suitable components to make the pump control power mechanism have higher dynamic characteristics as far as possible. In addition, measures should be taken to reduce or avoid the adverse effects of external factors on system performance. Through simulation and prototype test, the direct drive pump controlled servo hydraulic press can save more than 20% energy compared with the common multi-function drawing hydraulic press. The results show that the results of numerical simulation and experimental research are in good agreement with each other, and the correctness of the mathematical simulation model is verified.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH137.51

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