基于超声波电机的增量式数字流量阀研究

发布时间：2018-03-23 07:17

本文选题：电液数字控制　切入点：增量式数字流量阀　出处：《昆明理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着计算机控制技术的不断发展,电液数字控制成为液压技术发展的必然趋势。增量式数字阀作为数字阀的一种,由于传统电磁式步进电机性能的限制,导致增量式数字阀发展缓慢,至今未形成标准化。超声波电机作为一种新型微特电机,具有响应速度快、定位精度高、分辨率高、低速大扭矩、易于微型化、工作无噪声、不受电磁干扰、断电自锁等特点,将其作为增量式数字阀驱动器,以提高其性能。本文阐述了增量式数字阀发展概况,分析了现阶段数字阀存在的问题,对比分析现有驱动器性能,得出超声波电机较其他电机在定位控制中具有明显优势。对超声波电机进行理论分析,提出采用驻波型超声波电机作为增量式数字阀的驱动器。设计了一种基于超声波电机的增量式数字流量阀,以提高阀的控制精度,增加其工作稳定性、减小噪声。应用FLUENT仿真软件对其节流口进行流道分析,通过阀芯、阀套结构的改进,扩大节流出口水力半径,减小了阀对温度与杂质的敏感度,提高了其流量控制稳定性。应用AMESim仿真软件对基于超声波电机的增量式数字流量阀进行了动、静态特性分析,得出所设计的阀响应速度快、控制精度高、工作稳定性好、分辨率高,研究分析了压力补偿装置各参数对其动态特性的影响,得出预紧力、弹簧刚度、阀芯质量、无弹簧阀芯端面积对数字阀的不同影响。
[Abstract]:With the continuous development of computer control technology, electro-hydraulic digital control has become an inevitable trend in the development of hydraulic technology. As a kind of digital valve, incremental digital valve is limited by the performance of traditional electromagnetic stepping motor. As a new type of micro motor, ultrasonic motor has high response speed, high positioning accuracy, high resolution, low speed and large torque, easy to miniaturize and no noise. It is used as an incremental digital valve driver to improve its performance. The development of incremental digital valve is described in this paper, and the problems existing in the digital valve at present are analyzed. By comparing and analyzing the performance of the existing actuators, it is concluded that the ultrasonic motor has obvious advantages over other motors in positioning control. An incremental digital flow valve based on ultrasonic motor is designed to improve the control accuracy and stability of the valve. Using FLUENT simulation software to analyze the throttle orifice, through the improvement of valve core and valve sleeve structure, the hydraulic radius of throttle outlet is enlarged, and the sensitivity of valve to temperature and impurity is reduced. The dynamic and static characteristics of the incremental digital flow valve based on ultrasonic motor are analyzed by using AMESim simulation software. It is concluded that the designed valve has high response speed, high control precision and good working stability. The influence of the parameters of the pressure compensation device on the dynamic characteristics of the valve is studied and analyzed. The effects of preload, spring stiffness, spool mass and the end area of the non-spring-free valve on the digital valve are obtained.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH137.52;TM359.9

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