Simulation Analysis Of Loss And Magneto-Thermal Coupling Of Permanent Magnet Synchronous Wheel

With the increasing lack of resources and people generally raise awareness of environmental protection,the development of new energy vehicles have been paid more and more attention.The core technology of new energy vehicles contains three blocks,which is the motor,battery and electronic control.Among them,in the motor driven aspects,permanent magnet synchronous wheel motor is famous for its high power density,high torque density characteristics in the field of new energy vehicles,which have great research and development prospects.However,the motor is affected by the installation space and the operating environment,the internal cooling conditions are poor.At the same time,the iron loss caused by the alternating magnetic field in the stator core,the copper loss in the coil winding and the higher harmonics of the air gap magnetic flux density of the stator and rotor can result in the eddy current loss in the permanent magnet,which will increase the temperature of the corresponding part of the motor.Therefore,the motor has serious heat problems in the actual operation.To solve the problem of motor temperature rise,accurately calculating the motor internal loss and temperature field is necessary.In this paper,the permanent magnet synchronous wheel motor is used as the research object,and the simulation model structure is established by using the finite element simulation software.The magnetic field of the permanent magnet synchronous wheel motor is analyzed,the magnetic field distribution is analyzed and the loss is calculated accurately.The parametric analysis of the electromagnetic field analysis model of the motor is carried out,and the influence of different structural parameters on the output characteristics and loss of the motor is obtained.The finite element software is used to simulate the magnetic field and temperature field of the motor,and the temperature field distribution of the motor at different moments is obtained.From the perspective of optimizing the structure parameters of the motor,the heat generation of the motor is reduced,and the characteristics of the motor stator and the cogging winding are analyzed.The cooling and oil cooling modes of the motor areanalyzed respectively,also the influence of the cooling method on the motor temperature rise.This method will improve the motor cooling conditions,the efficiency of motor operation that has a certain reference.At present,the domestic research on the temperature field of the motor is to load the calculated loss on the average heat load,and the simulation model also uses the two-dimensional model.This method does not take into account the axial temperature distribution,only considering the radial temperature field distribution,which tends to bring in the inaccuracy of the simulation of the temperature field.In this paper,the finite element software Maxwell and ANSYSWorkbench are used to simulate the electromagnetic field and temperature field,and the three-dimensional simulation model is established.The temperature field distribution of the model is obtained and the accuracy of the model simulation is improved.But the motor temperature field simulation is based on certain assumptions,therefore,how to improve the simulation accuracy for further research is necessary.