The Numerical Analysis Of Electromagnetic Field And Temperature Field In Hydraulic Motor-vane Pump

Traditional hydraulic power unit is low efficiency and high noise and so it limits its use and development at present.A new design which called the hydraulic motor-vane pump (HMP) is put forward.The electric motor and vane pump are combined as a whole unit which don't need coupler.The vane pump is skillfully integrated into the rotor of electric motor inside.Therefore,the intensity of magnetic,the air-gap induction and core losses will produce such changes.In the thesis,the numerical simulation,theoretical analysis and experimental analysis method combined together are used to investigate the static and transient electromagnetic field of electric motor in HMP and induction motor.It turns out the phenomenon of flux leakage in the electric motor of HMP is more serious than induction motor during starting time,and flux lines on the bar of rotor gathered on the top of rotor because of eddy current in the bar.The speed becomes low as the increase of internal diameter.There is little change on the non-load performance of electric motor in HMP when the diameter of rotor is among 60mm and 105mm.The temperature field of HMP is analyzed.The main contents of the thesis are as follows:In chapter 1,the background and significance of this thesis is presented.The history and current research progress on hydraulic motor pump are reviewed.The application of the finite element method to investigate the electric motor is summarized.Lastly,the main research subjects are presented.In chapter 2,the basic theory and numerical analysis about the electromagnetic field are summarized.The principle and method of finite element are introduced mainly.The theory of the performance of electric motor in HMP,basing on the finite element method in electromagnetic field,is established.In chapter 3,the basic working principle of HMP is expounded.The electromagnetic field both Transient and static on the three-phase asynchronous motor and motor of HMP is analyzed in detail.The distribution of magnetic flux density is simulated,and the curve of the density as the rotating angle is drawn.The core losses in the three-phase asynchronous motor is higher than motor of HMP.The flux density in air-gap and the harmonic wave changes greatly as the increase of the rotor diameter.In chapter 4,equivalent circuit and electromagnetic parameters of motor in HMP is introduced.The setting of parameter and boundary of motor in HMP is detailed.There is little change on the performance of electric motor of HMP when the diameter of rotor is among 60mm and 110mm.In chapter 5,the theory of temperature field is stated.The temperature field of HMP is analyzed.We can draw a conclusion that the effect of oil cooling is better than that of wind cooling.And the computing power loss of HMP is compared with the experimental results.There is a error between computing results and experimental results.The test method of hydraulic motor pump and test devices are introduced.