Research On SMC-Si Steel Composite Iron Core Disk Transverse-Flux Permanent Magnet Brushless Motor And Its Driven Control

The rapid development of economy and society has brought convenience to our life,but also caused the increasingly serious problems of resource shortage and environment pollution.The development of electric vehicles is an effective solution.As for the driven motor of electric vehicles,permanent magnet brushless motor has been widely used for its advantages of high efficiency,high power density and high torque density.The permanent magnet brushless motors with various structures have been developed in order to improve the performance of permanent magnet brushless motor in operation efficiency,power density and torque density.Among them,the disk transverse-flux permanent magnet brushless motor(DTFM)combines the advantages of concentrated winding motor,disk motor and transverse-flux motor and has the characteristics of short winding end,high fault tolerance,high torque density and independent electromagnetic load setting.However,its stator iron core adopts all the silicon steel sheet or SMC,which leads to the problem of large torque ripple and low no-load counter electromotive force.If combining the silicon steel stator tooth body and the SMC stator tooth boot that forms the SMC-Si steel composite iron core DTFM could effectively solve the problems of large cogging torque ripple and low counter electromotive force.In addition,the vector control technology is widely used in the driven control of permanent magnet brushless motor.But the current vector control system has poor universality and it is necessary to develop a vector control system for different motors to perform its best performance.In addition,the designing of the hardware circuit and the rationality of software algorithm still have a lot of room for improvement.Based on the introduction of the research background and significance of DTFM and vector control theory,this paper firstly proposed a SMC-Si steel composite iron core DTFM for the defects of Si steel iron core DTFM and SMC iron core DTFM and introduced the structural characteristics and superiority in detail.Then,the cogging torque and counter electromotive force of SMC iron core DTFM,Si steel iron core DTFM and SMC-Si steel composite iron core DTFM were comparised and analyzed which highlighted the advantages of small torque ripple,less magnetic flux leakage and high no-load counter electromotive force of SMC-Si steel composite iron core DTFM.And then,the three optimization parameters ?,? and ? of SMC-Si steel composite iron core DTFM were defined and the changing rule of the copping torque ripple and counter electromotive force of different iron core DTFM while the changing of the optimization parameters were analyzed.Then,a vector control system was designed for the SMC-Si steel composite iron core DTFM.The circuit stability and anti-interference ability of the control system were fully considered in the designing of the hardware circuit.And modular designing method was adopted in the designing process of software,which could reduce the developing difficulty and increase the readability and portability of the software.Finally,the generator experiment,load experiment and the temperature rising experiment were carried out for the prototype and the vector control system.The experiments verified the feasibility and superiority of the design scheme of the prototype and the vector control system.