Design And Analysis Of Novel Dual-Three-Phase Flux-Switching Permanent Magnet Machines

As the power source and core moving part of cutting-edge equipment,high-performance machine is the core and key to the development of chinese equipment manufacturing industry.The flux-switching permanent magnet(FSPM)machine inherits the advantages of stator permanent magnet machine such as simple rotor structure,strong robustness and high power/torque density,high power factor.The FSPM machine has broad application prospect and research value in wind power generation,electric vehicle,ship propulsion,rail transit,aerospace,and other high-tech fields.This thesis combines the structure of the dual rotors machine with the FSPM machine,and integrates the design of phase-group concentrated-coil(PGCC)and twist angle to propose a novel Dual-Three-Phase Flux-Switching Permanent Magnet Machine(DT-FSPM machine).The DT-FSPM machine is characterized by the dual rotors structure which can enhance integration of the machine.The adoption of PGCC can provide high winding factor,achieve modular design,and improve fault tolerance ability.Design of twist angle can improve the permanent magnet utilization and suppress the cogging torque.This thesis includes the following five aspects:(1)The development history of stator permanent magnet machines is reviewedsystematically,and the research statuses of FSPM machines and multiphase permanent magnet machines are summarized.(2)The basic structure and design criterion of the DT-FSPM machine areexpounded in detail.Aiming at the problem of the high cogging torque,the mechanism of cogging torque suppression under dual air gap is analyzed.According to the design principle of the twist angle,the influence of the twist angle on the machine is studied in multiple dimensions.Based on the EMC method,the principle of alternating magnetic concentration with dual air gap and twist angle is illustrated.The air gap magnetic field characteristics and torque generation mechanism of the proposed model are analyzed based on the flux modulation.(3)Based on the traditional design method of FSPM machines,a general design method of DT-FSPM machines with dual rotors is derived,including power dimension equation,permanent magnet type selection,pole slot combination for performance analysis,design of PGCC windings,etc.Then the parameterization model of 36s/37p DT-FSPM machine with dual rotors is established,and the highly sensitive parameters are optimized by single parameter scanning.Combined with Latin Hypercube sampling method,a high-precision response surface surrogate model is established to optimize torque,torque ripple and efficiency.Finally,the manufacturing size of DT-FSPM machine is determined.(4)According to the energy conversion characteristics of the divices with dual air gap composite magnetic field,the finite element method is used to model DT-FSPM machine and the electromagnetic characteristics are systematically studied.The traditional FSPM machine is designed as the standard model,and the comparative study is carried out to highlight the advantages of the proposed DT-FSPM machine,such as high torque density,low torque ripple and strong anti-saturation ability.(5)The mathematical model of DT-FSPM machine for decoupling control is established.The ontology model of DT-FSPM machine and vector control system are built,and the controlled performances under various working modes are simulated.According to the optimal size of prototype,and combined with the process requirements,the prototype manufacturing,processing,and assembly scheme are determined.The stator core,outer rotor,casing,and other main components are displayed.The feasibility of the motor design and manufacturing scheme is preliminarily verified,which lays a foundation for the subsequent prototype performance test.