Overview of marine integrated axial flow pump and its control technology

Axial flow pump is an important part of the ship. It is often used as the propeller of the ship or to transport large flow of liquid, so the research on it is very meaningful. This paper describes the development history of marine axial flow pump, introduces the separated axial flow pump and the integrated axial flow pump, and discusses the development of the motor of the integrated axial pump. Because the motor of integrated axial flow pump can not be installed with high-precision position sensor, the motor is generally controlled without position sensor. It is difficult to control the permanent magnet synchronous motor in the full speed range by a single positionless sensorless control algorithm. Therefore, this paper introduces the motor rotor position estimation and control methods when the motor is running at low speed and medium and high speed. In this paper, the technology of marine axial flow pump and the control technology of its driving motor are prospected, which has reference significance for the selection and control of marine axial flow pump.