The Selection Of Categories For Motors And Mode Of Speed Regulation Applied In Pumping Stations

Since the developing of national economy, a lot of pumping stations that in medium and big sized have builted one after another. But our country concentrate more efforts on the channel type, the blade and style of pumping station.This passage firstly investigate the current motors’conditions in pumping station. Our country adopted the driving mode of sychronous machine connected directly with pump,the speed can be controlled by changing the angle of pumping blade. Besides, high speed asynchronous motor connected with speed reducer is also used in many newly builted pumping station.This mode with lower cost and smaller size and attract a large amount usage.But researches aim on new type electric machines and drive models are scanty,this phenomenon cannot keep up with the developing of current technology.Secondly,this passage provide a detailed analysis for three new kinds of pumping used motor.Then make researches and analysis on several different aspects including principle,the structure and the operating characteristics.The AC-excited motor can realize stepless speed regulation.The inner-feeding motor can save energy.The double speed salient pole synchronous motor can run in different speed when the water changes seasonally.This paper adopted the double closed loop control strategy based on SVPWM.Then achieve the high power factor when regulating motor.The simulation results shows that these new pumping motors can improve efficiency,save energy and can change the speed adapting to the different hydraulic head.They are with strong flexibility and worthy of wide popularization.In the end, the passage make choices for motors and speed regulations.For energy saving station,the double speed synchronous is proposed.When the water level changed frequent,the AC excited motor,the doubly fed synchronous and the internal feedback motor can be adopted.But in consideration of investment,the doubly fed synchonous costs much on the stator equipment and AC excited machine needs transformer. So the internal feedback motor can be the best choise.In addition,pumping motor can also use synchronous and asynchronous mixed motor,this mode can not only save the investment,but also can improve the power factor.