Analysis of Shaft Power of Centrifugal Pump under Variable Speed Condition

The shaft power of the centrifugal pump is one of the important parameters of the reasonable matching of a motor-pump system. Firstly, this paper elaborates the basic principle of the throttle control and the vector control strategy to adjust the speed for changing operation point of the centrifugal pump. Then a comparative analysis of the shaft power of the centrifugal pump is conducted by two regulation methods under the equal flow rate condition. Finally, simulation results show that the vector control speed regulation method requires 37% less shaft power than the throttle control method to drive the centrifugal pump. It can provide reference for the high efficient matching of motor-pump systems.