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介绍了一种由步进电机作为电 -机械转换元件的数字阀实现电液(气 )直接数字控制的新方法。该方法通过控制步进电机相邻相序通电时间的长短 ,实现阀的输出信号的连续可控。应用这种方法解决了传统的步进式电液 (气 )控制元件所存在的响应速度与精度之间的矛盾 ,同时保持其固有的重复精度高、无滞环及线性度好的优点。给出利用阀芯的双自由度原理设计的数字伺服阀在连续跟踪控制下的实验结果 ,表明采用新的数字控制方法可以使阀获得理想的动静特性。
A new method of direct digital control of electro-hydraulic (gas) is introduced by using a stepper motor as digital valve of electro-mechanical conversion element. The method realizes continuous and controllable output signal of the valve by controlling the duration of the energization of the adjacent phase sequence of the stepping motor. This method solves the conflict between the response speed and the accuracy of the conventional stepping electro-hydraulic (gas) control element, while keeping the inherent advantages of high repetition accuracy, no hysteresis and good linearity. The experimental results of the digital servo valve designed on the principle of two degrees of freedom using the valve spool under continuous tracking control are given. The new numerical control method is used to obtain the ideal dynamic and static characteristics of the valve.