This paper presents a fast simulation model for predicting the dynamic response of a motor-pump system to startup event. The purpose is to analyze the effect of the impeller acceleration time, the final flow rate and the impeller geometry on the pump transient flow during starting operations. The motor speed and torque variations were predicted by simulating the transient law of the three-phase induction motor by adopting the d-q axes theory. The pump model was built by solving the unsteady flow governing equations with the method of characteristics (MOC). The whole model was validated with available tests from literature. Accordingly, the computation of impeller acceleration, the motor torque, the unsteady pressure and flow rate was made for various starting conditions. The results have revealed that during its starting time, the pump hydraulic transients are well influenced by the motor speed acceleration, the flow inertia and the impeller geometry. Through the analysis of the simulation results, the conclusion was that the accuracy of the present method is reasonable, and it can be used for assisting pumping system design.

本文提出了一种快速仿真模型，用于预测电动机-泵系统对启动事件的动态响应。目的是分析叶轮加速时间，最终流量和叶轮几何形状对启动过程中泵瞬态流量的影响。采用dq轴理论，通过模拟三相感应电动机的暂态规律，预测了电动机的转速和转矩变化。通过使用特征方法（MOC）求解非恒定流量控制方程，建立了泵模型。整个模型已通过文献中的可用测试进行了验证。因此，针对各种起动条件进行了叶轮加速度，电动机转矩，不稳定压力和流量的计算。结果表明，在启动期间，泵的液压瞬变受电动机速度加速度，流惯性和叶轮几何形状的影响很大。通过对仿真结果的分析，得出的结论是，该方法的准确性是合理的，可用于辅助抽水系统的设计。