Design And Analysis Of Inset Permanent Magnetic Partitioned Stator Hybrid Excited Machine

In order to implement the "carbon peak,carbon neutral" policy,the country has invested a large amount of funds for the development of new energy vehicles to improve environmental pollution and energy crisis.Hybrid excitation machine has a broad application prospect in the field of electric vehicles due to its advantages of high torque density and easy adjustment of magnetic field.The excitation source of hybrid excitation motor includes permanent magnet and excitation winding.The introduction of excitation winding gives the hybrid excited machine the ability to regulate the magnetic field.However,the space competition between the armature winding and the excitation winding is a problem of traditional hybrid exciting machine,which leads to the difficulty of the increase of the machine torque.In addition,the magnetic circuit of the excitation winding often passes through the permanent magnet to form a closed circuit,which reduces the magnetic adjustment ability of the machine.For this reason,a partitioned stator hybrid excited machine with inset permanent magnet is proposed in this thesis.The introduction of partitioned stator overcomes the space conflict between armature winding and excitation winding,improving the utilization rate of motor space,and thus the torque of motor is increased.The introduction of surface inset permanent magnet creates parallel magnetic circuit and improves the magnetic regulating ability of the machine.Based on the above theoretical research,the main research achievements of this thesis include the following aspects:1.A new IPM-PSHE machine is proposed,and the selection method of pole groove fit,winding configuration and the basic principle of mixed excitation are expounded.Aiming at the proposed IPM-PSHE motor,the topological structure and the position distribution of windings are described in detail.All possible pole-groove matches are listed,and the machine model with the best performance is selected.Finally,the basic principle of magnetic circuit and mixed excitation of IPM-PSHE motor is analyzed.2.An analysis method of air gap magnetic field harmonics is proposed.According to the equivalent air gap principle of the machine and the topological structure of the IPM-PSHE motor,the analytical expressions of the magnetomotive force and the modulation operator were derived.Then,the formula of the magnetic density of the inside and outside air gap was derived,and the order and amplitude of the field harmonics of the air gap were obtained.The contribution of the effective air gap field harmonics to the back potential was studied,which laid the foundation for the subsequent multi-objective optimization.3.Based on the analysis of air gap magnetic field harmonics,a performance optimization method based on air gap magnetic field harmonics is established.The key air gap field harmonics are selected to establish the mathematical model of optimization target.Through sensitivity analysis,the response surface models of the optimization targets are created.The electromagnetic performance was optimized by genetic algorithm,pareto frontier was obtained.Then,the best machine model was selected.4.The basic electromagnetic properties of IPM-PSHE machine under different excitation conditions,such as magnetic field distribution,cogging torque,back potential,magnetic regulating ability and electromagnetic torque,are analyzed;In addition,the concept of optimal copper consumption ratio is introduced.By balancing the copper consumption ratio of the armature winding and the excitation winding,the motor torque is maximized under the condition that the copper consumption is fixed.Finally,the IPM-PSHE motor is compared with the existing motors in other literatures,and the advantages of IPM-PSHE motor are proved.5.The prototype was manufactured and experimental research was carried out.The machining instructions of the motor were drawn,and the prototype model was manufactured.The steady-state and dynamic properties of the prototype,such as back potential and torque,were verified under different excitation conditions.And,the reliability and effectiveness of the structural design of IPM-PSHE machine was proved.