Research Of Several Key Technologies Of Transverse Flux Permanent Magnet Machine Drive System

Transverse Flux Permanent Magnet Machine(TFPM)owns such advantages: high torque density,high degrees of design freedom and decoupling between magnetic path and electric circuit,however,the imperfect design process,high cogging torque and large flux leakage have restricted the TFPM's popularization and application.Therefore,this thesis mainly figures out the key technologies of TFPM design,TFPM multi-objective design,fault diagnosis and fault tolerant control of the TFPM drive system,The research results have the theoretical research significance and engineering application value to achieve the TFPM's popularization and application in electric vehicle area.This thesis first designs the stator and rotor topology of TFPM,and determines the parameters and geometric size of TFPM by combing magnetic circuit calculation and 3-D Finite Element Analysis(FEA)together,the suppression of both cogging torque and flux leakage is realized via 3D-FEA parameter scanning,afterwards,the initial design scheme of TFPM is achieved.And then,the TFPM multi-objective optimization based on optimization algorithm is investigated,the key technologies of reasonable selection and matching of multi-objective optimization algorithm and objective function evaluation strategy,determination of optimization variables and objective functions,TFPM multi-objective optimization realization based on VBscript are conquered,a complete and referencable solution of TFPM multi-objective optimization design is achieved.Then,to improve the use ratio of permanent magnet(PM),a half-PM rotor scheme of surface mounted TFPM which based on PM concentration principle is proposed,in view of the scheme has the deficiency of complex process and inadequate gap accuracy which caused by the auxiliary stator,then,a concentrated flux TFPM with no auxiliary stator is designed,the auxiliary stator is canceled by the reasonable matching of topology and magnetic path.Via Taguchi orthogonal matrix experimental method,the suppression of both cogging torque and flux leakage of the concentrated flux TFPM is achieved,in the meantime,the PM use ratio is improved.Based on dSPACE platform,the TFPM drive system hardware,software and the experimental test bench are set up,the rationality and feasibility of the TFPM drive system are validated through TFPM no-load experiment and TFPM drive system load experiment.To achieve the robust and stable operation of TFPM drive system,by combing the system simulation and experiment validation together,the fault diagnosis and fault tolerant control of TPFM drive system's key sensors are researched.For the current sensor fault,the technical problems that the current sensor fault diagnosis strategy's failure due to the inverter dead-time effect and the system hard to realize fault tolerant control after current sensor fault occurs are conquered,the solution to realize the safe and stable operation of TFPM drive system is proposed by integrating inverter dead-time compensation,current sensor fault diagnosis and fault tolerant control together.For resolver based position sensor fault,the position deviation and the fault features of d-and q-axis stator currents caused by resolver fault are analyzed,the effective extraction and separation of fault features in q-axis stator current are presented,the position sensor online fault diagnosis is achieved by fault mode location,identification and fault degree evaluation,the effect of q-axis current ripple caused by inverter dead-time effect on the diagnosis accuracy of position sensor fault is skillfully avoided.And then,the system solution of TFPM drive system position sensor fault tolerant control is achieved by using the obtained position deviation.