Design And Analysis Of High-speed Axial-flux Reluctance Motor With Permanent Magnet Assisted

According to China’s development plan for the next few years,China will focus on the development of deep space and space vehicles field,deep sea equipment,precision machining machine and electromobile.Therefore,the development of medium or small high speed motors with high power density becomes the basis of further research in the above fields.The Switched Reluctance Motor(SRM)has the advantages of simple and firm structure,low manufacturing cost.The SRM is less affected by high temperature.The above advantages make SRM widely used in the field of high speed motor.However,the SRM has obvious disadvantages in two aspects: the excessive torque ripple at low speed and the torque reduction due to its operation of tangential magnetic pull with magnetoresistance properties.The High-Speed Axial-Flux Reluctance Motor(HSAFRM)with permanent magnet assisted is proposed in this thesis to improve the deficiency of the SRM.The magnetic field of the HSAFRM with permanent magnet assisted is formed by the superposition of the auxiliary magnetic field of the permanent magnet and the main magnetic field of the coil.Firstly,based on the existing axial flux the SRM structure,combined with the advantages of hybrid excitation motor,a new axial flux path motor structure is proposed.Based on the topological characteristics of the HSAFRM,the working principle of the HSAFRM and the difference between the HSAFRM and the traditional SRM are analyzed.The basic equations of the HSAFRM are given and its electromagnetic characteristics are briefly analyzed.Secondly,according to the technical requirements of the HSAFRM design by analogy with the design principle of the SRM and size calculation method combined with the special structure of the HSAFRM,the structural parameters of the HSAFRM were calculated.The embedding position of permanent magnet and the selection of permanent magnet material are determined.The magnetization curves of the HSAFRM at two important rotor positions are calculated,which provides a design basis for the design and calculation of motor winding parameters.The preliminary design of the new motor is completed.Finally,the three dimensional finite element method is used to conduct static and dynamic analysis of the electromagnetic field of the HSAFRM,which verifies the rationality of the HSAFRM.In this thesis,the comparative analysis method is used,and the analysis results show that the permanent magnet aided design can effectively improve the torque characteristics of the motor and improve the efficiency of the motor.The influence of motor structure parameters on the HSAFRM performance was analyzed by parameterization method,and the thermal characteristics of the HSAFEM were analyzed by electromagnetic and thermal coupling method,which laid a foundation for the optimization design of the HSAFRM in the future.