Design And Optimization Of Axial Flux ISG Motor Based On SMC

Because the axial flux motor has the advantages of compact structure,small volume and high power density,it is in line with the development direction of vehicle motor.And the axial flux motor is mostly disc structure,which is the same as the integrated stater / generator(ISG)structure used in hybrid electric vehicle,so this paper designs and studies the axial flux motor used in ISG of hybrid electric vehicle.The axial flux motor has a small volume and a large internal flux density.When the motor is in a high-frequency operation state,it will produce a large iron loss.Soft magnetic composite(SMC)can be used to reduce the iron loss of the high-frequency stator of the motor,so as to improve the operation efficiency of the motor.But the permeability of SMC material is lower than that of silicon steel sheet,which will affect the torque output ability of motor.How to make use of the advantages of SMC materials to optimize the structure of the motor and make the axial flux motor have good torque output capability and torque performance is an important research topic.Firstly,the characteristics of SMC are introduced,and the differences between SMC and silicon steel sheet are compared.This paper analyzes the running state of ISG motor in different driving states of hybrid electric vehicle.Combined with the performance index of the motor,the size parameters of the motor are calculated,and the detailed calculation process is given.According to the calculated motor size parameters,through the method of finite element simulation,the no-load and load state of different motor stator topology are compared and analyzed,the stator structure with the best performance is selected,and combined with the advantages of SMC materials,the stator structure of the motor is optimized design,in order to improve the torque output capacity of the motor.Secondly,the rotor structure of the motor is optimized to solve the problem of excessive cogging torque.Based on the cogging torque expression of radial flux motor and the motor models of two kinds of motor,the cogging torque expression of axial flux motor is derived.The influence of pole arc coefficient of rotor permanent magnet on cogging torque is analyzed,and the cogging torque of motor is restrained by the method of hybrid permanent magnet.The constraint relationship of the permanent magnet is verified by the finite element simulation method.Thirdly,the basic performance of the designed and optimized motor is analyzed by finite element simulation,and the performance of SMC axial motor and radial motor is compared.The performance of ISG motor in different running states is simulated and analyzed by the method of finite element simulation.In order to ensure the operation safety of the motor,the temperature of the motor is simulated and analyzed.Finally,the prototype of the motor is designed.