Optimal Design And Temperature Analysis Of The Magnetic-Geared Dual Rotor Motor

With the severe exhaust emissions,the global warming is getting worse.Thus,the elimination of traditional fuel vehicles and the rise of pure electric vehicles are the general trend.While the hybrid electric vehicles(HEV)which is considered as a transitional product have great research value.At present,the Toyota hybrid system(THS)has a monopoly on the market,but its core power split device(PSD)adopts the planetary gears,which have many defects such as mechanical wear,noise,vibration,and complex maintenance.Therefore,pure electrification of the transmission system is the future solution for the HEVAt the same time,the magnetic gear technology is developing rapidly.The magnetic gear can realize the direct torque transmission without the mechanical wear or noise,and greatly reduce the follow-up maintenance cost.Based on the kinematics dual relationship between planetary gears and coaxial magnetic gears(CMG),the dissertation combines the CMG with permanent magnet synchronous motor(PMSM)to obtain the topology of the magnetic-geared dual rotor motor(MGDRM).Then,the dissertation optimizes and manufactures a principal prototype.What’s more,the loss and the temperature field of the MGDRM have been detailed analyzed,and the online temperature acquisition method of the rotor of the MGDRM is proposed for the first time.Firstly,the dissertation derives the basic structure of the MGDRM though conclude the mechanism of the CMG,and then focuses on the analysis of the characteristics between the torque and speed of the MGDRM.On this basis,the application of the MGDRM in the actual HEV is further analyzed,and the configuration principle of the MGDRM is analyzed from the angle of pole pair and winding.Secondly,the dissertation introduces the manufacturing method of the outer rotor of the MGDRM,and optimizes the MGDRM through the split ratio and gear width ratio,then a series of important motor design parameters are obtained.Thirdly,the dissertation establishes a 2-D transient loss model and a 3-D steady-state temperature field model of the MGDRM through finite element software.Then,the loss and the temperature distribution of the MGDRM under different load have been analyzed.Furthermore,the overall heat transfer direction of the MGDRM has been obtained.Finally,the dissertation built a low-power prototype and a test platform.With the online acquisition method proposed in the dissertation,the temperature distribution of the MGDRM can be measured,consist of stator windings,stator teeth,stator yoke,frame and the rotors.