基于转矩控制的变转速定量泵压力控制方法

变转速电液泵可以大幅提升液压动力源能效,但采用变转速电机驱动定量泵作为动力源时,通过控制转速实现压力控制,难以适应流量快速大范围变化的工况.为解决这一问题,采用电机转矩控制液压泵输出压力,实现动力源与流量无关的压力控制.与变转速控制相比,电机转矩属于控制内环,响应速度快;由于泵输出压力与其排量的乘积基本等于电机的输出转...

Pressure Control Method of Variable Speed Quantitative Pump Based on Torque Control

Variable speed electro-hydraulic pumps can greatly improve the energy efficiency of hydraulic power sources. However, when variable speed motors are used to drive fixed pumps as power sources, pressure control is achieved by controlling the speed. In this way, rapid and large-scope changes in flow are not easy to achieve. In the pressure control, the output pressure of the hydraulic pump can be controlled by the motor torque. So as to realize the pressure control that the power source has nothing to do with the flow. Because of controlling the motor torque pertain to the inner cycle of motor, the pressure response rate is swift. The pump capacity multiplied by its delivery pressure is equal to motor torque value, and the control is more direct and simple. The corresponding connection between the output pressure of fixed displacement pump and the motor torque is affected by their productiveness. So pressure feedback is mentioned to achieve high accuracy pressure controlling. The simulation results show that: in this way, the pressure response time is decreased to 40 ms, the return error of static characteristic curve is fewer than 2%.