伺服电机定量泵驱动差动液压缸系统效率的研究

对伺服电机和定量液压泵组合驱动差动液压缸系统的特性和效率进行研究。针对应用恒定总压力对液压缸2腔预压紧、系统能量效率低的不足,提出用负载敏感原理和总压力设定曲线预先给定的方法,使液压缸运动过程中的系统压力与负载相适应,同时维持背压在一个较低的值,减小了系统的能耗和泵的发热。进一步提出用低压蓄能器对液压缸2腔预压紧的回路原理,不仅简化了控制回路,也降低了电机和液压系统的能耗。研究工作获得了数字仿真和试验的验证。

Study on the Efficiency of Differential Cylinder System Driven with Servo Motor and Constant Pump

Study on the efficiency and performance of the differential cylinder system driven by two AC servo motors and two constant pumps. To the problem of poor efficiency when cylinder is pre-charged with constant sum pressure, two new principles to setting the sum pressure by load sensing and given the sum pressure profile in advance are suggested and investigated. With the new principle, the pressure of the system will be adaptive to the load and the back pressure keeps in a lower value. The energy loss of the system and the warming in pump are reduced. Further a new principle to pre-charge the cylinder using an accumulator is put forward. With this method, the controller is simplified and the energy loss in motors and the hydraulic system is cut down. The research work is verified by the digital simulation and the experiment.