高精度超高压液相泵等面积平滑补偿控制方法

针对高精度超高压液相泵运行时易在加速度拐点处出现电机抖动的问题,提出了一种等面积平滑补偿控制方法。对液相泵运行曲线进行平滑处理,确保液相泵在初始速度较高的加速度拐点处平稳过渡,不产生抖动;对因平滑处理而减小的位移进行补偿,确保在液相泵单个运行周期结束前补齐位移,使得液相泵的吸入液体总量与排出液体总量不变。最后通过电机运行试验、流量精度检测试验、响应速度检测试验、超高效分离试验来验证所提方法的可行性。试验结果表明:等面积平滑补偿控制方法解决了电机在高初始速度的加速度拐点处抖动的问题,使液相泵输出液体的流量精度从0.081%提高到0.055%。等面积平滑补偿控制方法有效提高了液相泵输出液体的流量精度,具有实时性强、计算精度高等特点,为提高样品检测效率提供了一定的理论依据。

Equal-area smoothing compensation control method for high-precision ultra-high pressure liquid pump

Aiming at the problem that the motor jitters at the acceleration inflexion point during the operation of high-precision ultra-high pressure liquid pump,an equal-area smoothing compensation control method is proposed. The running curve of liquid pump was treated smoothly to ensure the liquid phase pump smooth transition at the acceleration inflexion point with high initial speed and no jitter. The displacement reduced due to smoothing treatment was compensated to ensure that the displacement was same before the end of the single operation cycle of the liquid pump, so that the total amount of liquid suction and discharge of the liquid pump remained unchanged.Finally, the motor running test, flow accuracy detect test, response speed detect test and ultra-efficient separation test were carried out to prove the feasibility of the equal-area smoothing compensation control method. The tested result showed that the equal-area smoothing compensation control method could solve the problem of motor jitterd at the acceleration inflexion point with high initial speed, and the flow precision of the output liquid of liquid pump was improved from 0.081% to 0.055%. The eaqul area smoothing compensation control method effectively improves the flow precision of the output liquid of liqud pump, and has the characteristics of strong instantaneity and high calculation accuracy, which can provide a certain theoretical basis for improving the efficiency of sample detection.