Research On Control System Of Fault-tolerant Hybrid Excitation Flux-switching Permanent Magnet Motor

Fault-tolerant hybrid excitation flux-switching permanent magnet(FTHEFSPM)motor is a novel type of doubly salient stator-type permanent magnet motor,which has the advantages of large power density,high efficiency,strong fault tolerance and wide speed operation range.Therefore,it has a good application prospect in electric vehicles.In this paper,a 6/14 pole FTHEFSPM prototype is used as the control object to study its control system.Firstly,the topology of the FTHEFSPM motor is introduced,and the working principle are analyzed.Based on these,the mathematical models of FTHEFSPM motor are established in three-phase static abc coordinate system and two-phase rotating dq coordinate system,respectively.Secondly,based on the principle of constant magnetomotive force and mimimum copper loss,the minimum copper loss fault-tolerant control system of FTHEFSPM motor are constructed under model predictive torque control(MPTC)and deadbeat model predictive flux control(DB-MPFC)algorithms,respectively.By MATLAB/Simulink,the fault-tolerant control system are studied and analyzed under single-phase winding open-circuit fault.Thirdly,to improve the steady state performance of the motor control system,a TVS-MPFC method of FTHEFSPM motor is proposed.The basic principle of the TVS-MPFC-I method is introduced,and the candidate voltage vector selection and duty cycle calculation are deeply analyzed.Based on these,the TVS-MPFC-II method is proposed for the deficiency of the II-vector limited to zero vector in the TVS-MPFC-I method.The dynamic and steady-state performance and fault-tolerant performance of FTHEFSPM motor control system are studied by MATLAB/Simulink under traditional MPTC,TVS-MPFC-I and TVS-MPFC-II methods,respectively.Fourthly,the experimental platform of FTHEFSPM motor drive system is built based on d SPACE1104 controller.The hardware circuits are designed by Altium designer 14,including the rotor position detection circuit,the signal sampling and protection circuit,the drive circuit and the power supply circuit.The software program of motor drive system is designed by MATALB/Simulink and Real-Time Interface(RTI).Based on the experimental platform of the drive system,the dynamic and steady-state performance of the FTHEFSPM motor are studied under the traditional MPTC,TVS-MPFC-I and TVS-MPFC-II methods,respectively.The correctness and effectiveness of the research are verified by simulation and experimental results.The research results promote the application and development of FTHEFSPM motor in electric vehicles.